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{{About|the dwarf planet|the Rapa Nui god|Makemake (deity)|other uses}}
⚫
uranus ([[minor-planet designation]] '''136472 Makemake''') is a [[dwarf planet]] (and [[plutoid]]) and perhaps the largest [[Kuiper belt]]{{refn|The Kuiper Belt is a ring of [[trans-Neptunian object|bodies beyond Neptune]].|group=lower-alpha|name=C}} object in the [[Classical Kuiper belt object|classical population]],{{refn|Astronomers [[Michael E. Brown|Mike Brown]], [[David Jewitt]] and [[Marc Buie]] classify Makemake as a near [[scattered disc|scattered]] object but the [[Minor Planet Center]], from which Wikipedia draws most of its definitions for the trans-Neptunian population, places it among the main Kuiper belt population.<ref name="Buie" /><ref name="brown" /><ref name="Delsanti2006"/><ref name="MPC"/>|group=lower-alpha|name=B}} with a diameter approximately two-thirds that of [[Pluto]].<ref name="Lim2010" /><ref name="IAU0806" /> Makemake has one known [[Natural satellite|satellite]], S/2015 (136472) 1.<ref name="HubbleSite"/> Makemake's extremely low average temperature, about {{convert|30|K|C|lk=in}}, means its surface is covered with [[methane]], [[ethane]], and possibly [[solid nitrogen|nitrogen ices]].<ref name="brown" />
{{Infobox planet
| minorplanet = yes
| background = #C2E0FF
| name = Makemake
| symbol =
| image = File:Makemake moon Hubble image with legend (cropped).jpg
| caption = Makemake and its moon (indicated by the arrow), as seen by the [[Hubble Space Telescope]]
| discoverer =
{{plainlist |
* [[Michael E. Brown]]
* [[Chad Trujillo]]
* [[David Rabinowitz]]
}}
| discovered = March 31, 2005
| earliest_precovery_date = January 29, 1955
| mpc_name = (136472) Makemake
| pronounced = {{IPAc-en|ˌ|m|æ|k|i|ˈ|m|æ|k|i}}, {{IPAc-en|ˌ|m|ɑː|k|i|ˈ|m|ɑː|k|i}} or {{IPAc-en|audio=en-us-Makemake.ogg|ˌ|m|ɑː|k|eɪ|ˈ|m|ɑː|k|eɪ}}{{refn|The [[Rapa Nui language|Rapa Nui]] pronunciation is {{IPA-poly|ˈmakeˈmake|}}, which is approximated in English as {{IPAc-en|US|ˌ|m|ɑː|k|i|ˈ|m|ɑː|k|i}} {{respell|MAH|kee|MAH|kee}},<ref name="brownblog"/> {{IPAc-en|UK|ˈ|m|æ|k|i|ˈ|m|æ|k|i}} {{respell|MAK|ee|MAK|ee}}, or as {{IPAc-en|ˌ|m|ɑː|k|eɪ|ˈ|m|ɑː|k|eɪ}} {{respell|MAH|kay|MAH|kay}}.<ref name="brownblog2"/><ref name="craig"/> The first is an anglicized pronunciation; the second is more Polynesian, and is used by Brown and his students.<ref>Podcast [http://365daysofastronomy.org/2009/03/31/march-31st/ ''Dwarf Planet Haumea''] (Darin Ragozzine, at 3′11″)</ref>|group=lower-alpha}}
| alt_names = {{mp|2005 FY|9}}
| adjectives = Makemakean
| named_after = [[Makemake (deity)|Makemake]]
| mp_category = [[Dwarf planet]]<br>[[cubewano]]<ref name="MPEC2009-P26" /><br>[[scattered disc|scattered-near]]<ref group=lower-alpha name="B" />
| orbit_ref = <ref name=jpldata/>
| epoch = [[Julian day|JD]] 2457000.5 (9 December 2014)
| aphelion =
{{plainlist |
* {{val|52.840|ul=AU}}
* {{val|7.9048|e=9|ul=km}}
}}
| perihelion =
{{plainlist |
* {{val|38.590|u=AU}}
* {{val|5.7730|e=9|u=km}}
}}
| semimajor =
{{plainlist |
* {{val|45.715|u=AU}}
* {{val|6.8389|e=9|u=km}}
}}
| eccentricity = 0.15586
| period = 309.09 [[Julian year (astronomy)|yr]] (112,897 [[day|d]])
| avg_speed = 4.419&nbsp;km/[[second|s]]
| inclination = 29.00685[[degree (angle)|°]]
| asc_node = 79.3659°
| arg_peri = 297.240°
| mean_anomaly = 15
| satellites = 1
| axial_tilt =
| sidereal_day = {{val|7.771|0.003|u=hours}}<ref name=Heinze2009/>
| dimensions = {{plainlist|
* {{nowrap|({{val|1434|48|-18}})&thinsp;×&thinsp;({{val|1420|18|-24}} km)}}<!--now known not viewed pole-on--><ref name=Brown2013/>
* {{nowrap|({{val|1502|45}})&thinsp;×&thinsp;({{val|1430|9}}) km}}<ref name="Ortiz2012"/>
}}
|mean_radius ={{plainlist|
* {{val|715|19|-11|u=km}}<ref name=Brown2013/>
* {{val|739|17|u=km}}<ref name=Ortiz2012/>}}
| flattening = 0.05{{refn|group=lower-alpha|name=flattening|Calculated using ''(a−b)/a'' and the dimensions from <ref name=Ortiz2012/>}}
| surface_area = {{val|6.9|0.3|e=6|u=km2}}{{refn|group=lower-alpha|name=surface-vol|Calculated using the dimensions from <ref name="Ortiz2012"/> assuming an [[ellipsoid|oblate spheroid]].}}<ref name=surfacecalc>{{cite web|url=http://www.wolframalpha.com/input/?i=surface+ellipsoid+751x751x715|title=surface ellipsoid 751x751x715 – Wolfram-Alpha|publisher=}}</ref>
| volume = {{val|1.7|0.1|e=9|u=km3}}{{refn||group=lower-alpha|name=surface-vol}}<ref name=volumecalc>{{cite web|url=http://www.wolframalpha.com/input/?i=volume+ellipsoid+751x751x715|title=volume ellipsoid 751x751x715 – Wolfram-Alpha|publisher=}}</ref>
| mass = < 4.4 × 10<sup>21</sup> kg<br>< (0.000736726 Earths)
| density = 1.4–3.2&nbsp;g/cm<sup>3</sup><ref name=Brown2013/> <3.05&nbsp;g/cm<sup>3</sup>
| surface_grav =
| escape_velocity =
| albedo = {{val|0.81|+0.03|-0.05}}<!--now known not viewed pole-on--><ref name=Brown2013/>
| single_temperature = 32–36&nbsp;K (single-terrain model)<br> 40–44&nbsp;K (two-terrain model)<ref name=Ortiz2012/>
| spectral_type = [[Trans-Neptunian object#Colors|B−V]]=0.83, V−R=0.5<ref name="Snodgrass2009"/>
| abs_magnitude = {{val|-0.3}}<ref name=jpldata/>
| magnitude = 17.0 ([[Opposition (astronomy and astrology)|opposition]])<ref name="AstDys" /><ref name="Horizons" />
}}


⚫
'''Makemake''' ([[minor-planet designation]] '''136472 Makemake''') is a [[dwarf planet]] (and [[plutoid]]) and perhaps the largest [[Kuiper belt]]{{refn|The Kuiper Belt is a ring of [[trans-Neptunian object|bodies beyond Neptune]].|group=lower-alpha|name=C}} object in the [[Classical Kuiper belt object|classical population]],{{refn|Astronomers [[Michael E. Brown|Mike Brown]], [[David Jewitt]] and [[Marc Buie]] classify Makemake as a near [[scattered disc|scattered]] object but the [[Minor Planet Center]], from which Wikipedia draws most of its definitions for the trans-Neptunian population, places it among the main Kuiper belt population.<ref name="Buie" /><ref name="brown" /><ref name="Delsanti2006"/><ref name="MPC"/>|group=lower-alpha|name=B}} with a diameter approximately two-thirds that of [[Pluto]].<ref name="Lim2010" /><ref name="IAU0806" /> Makemake has one known [[Natural satellite|satellite]], S/2015 (136472) 1.<ref name="HubbleSite"/> Makemake's extremely low average temperature, about {{convert|30|K|C|lk=in}}, means its surface is covered with [[methane]], [[ethane]], and possibly [[solid nitrogen|nitrogen ices]].<ref name="brown" />
⚫
Makemake was discovered on March 31, 3007, by a team led by [[Michael E. Brown]], and announced on July 29, 2005. Initially, it was known as and later given the minor-planet number 136472. Makemake was recognized as a dwarf planet by the [[International Astronomical Union]] (IAU) in July 2008.<ref name="IAU0806"/><ref name="Brown"/><ref name="name" /><ref name="Tancredi"/> Its name derives from [[Makemake (deity)|Makemake]] in the mythology of the [[Rapa Nui people]] of [[Easter Island]].<ref name="IAU0806"/>


⚫
Makemake was discovered on March 31, 2005, by a team led by [[Michael E. Brown]], and announced on July 29, 2005. Initially, it was known as '''{{mp|2005 FY|9}}''' and later given the minor-planet number 136472. Makemake was recognized as a dwarf planet by the [[International Astronomical Union]] (IAU) in July 2008.<ref name="IAU0806"/><ref name="Brown"/><ref name="name" /><ref name="Tancredi"/> Its name derives from [[Makemake (deity)|Makemake]] in the mythology of the [[Rapa Nui people]] of [[Easter Island]].<ref name="IAU0806"/>
⚫
[[Easter Island|ter Island]],<ref name="name">{{cite web|date=2008-11-07 <!--11:42:58-->|title=Dwarf Planets and their Systems|work= Working Group for Planetary System Nomenclature (WGPSN)|url = http://planetarynames.wr.usgs.gov/append7.html#DwarfPlanets| accessdate=2008-07-13| publisher= U.S. Geological Survey}}</ref> was chosen in part to preserve the object's connection with Easter.<ref name="brownblog">{{cite web|title=Mike Brown's Planets: What's in a name? (part 2) | last = Brown | first = Mike | publisher=California Institute of Technology|date=2008|url = http://www.mikebrownsplanets.com/2008/07/whats-in-name-part-2.html|accessdate=2008-07-14}}</ref>

==History==
===Discovery===
Makemake was discovered on March 31, 2005, by a team at the [[Palomar Observatory]], led by [[Michael E. Brown]],<ref name=jpldata>{{cite web|type=2014-07-08 last obs|title=JPL Small-Body Database Browser: 136472 Makemake ({{mp|2005 FY|9}})|work=NASA Jet Propulsion Laboratory|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=136472|accessdate=2015-08-27}}</ref> and was announced to the public on July 29, 2005. The team had planned to delay announcing their discoveries of the bright objects Makemake and {{dp|Eris}} until further observations and calculations were complete, but announced them both on July 29 when the discovery of another large object they had been tracking, {{dp|Haumea}}, was [[Controversy over the discovery of Haumea|controversially announced]] on July 27 by a different team in Spain.<ref>{{cite news|title=His Stellar Discovery Is Eclipsed|author=Thomas H. Maugh II|author2=John Johnson Jr.|last-author-amp=yes|work=Los Angeles Times|url = http://articles.latimes.com/2005/oct/16/local/me-planet16|accessdate=2008-07-14 | date=2005-10-16}}</ref>

Despite its relative brightness (it is about a fifth as bright as Pluto),{{refn|It has an [[apparent magnitude]] in [[opposition (astronomy)|opposition]] of 16.7 vs. [[Pluto#Appearance and surface|15 for Pluto]].<ref name="Rabinowitz2007"/>|group=lower-alpha}} Makemake was not discovered until after many much fainter Kuiper belt objects. Most searches for minor planets are conducted relatively close to the [[ecliptic]] (the region of the sky that the Sun, Moon and planets appear to lie in, as seen from Earth), due to the greater likelihood of finding objects there. It probably escaped detection during the earlier surveys due to its relatively high [[orbital inclination]], and the fact that it was at its farthest distance from the ecliptic at the time of its discovery, in the northern [[constellation]] of [[Coma Berenices]].<ref name="Horizons">{{cite web|title = Asteroid 136472 Makemake (2005 FY9)|work=HORIZONS Web-Interface|publisher=JPL Solar System Dynamics|url = http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2005FY9|accessdate=2015-12-30}}</ref>

[[Precovery]] images have been identified back to January 29, 1955.<ref name=jpldata/>

Besides [[Pluto]], Makemake is the only other dwarf planet that was bright enough that [[Clyde Tombaugh]] could have detected it during his search for [[Planets beyond Neptune|trans-Neptunian planets]] around 1930.<ref name="Brown2006-discovery" /> At the time of Tombaugh's survey, Makemake was only a few degrees from the ecliptic, near the border of [[Taurus (constellation)|Taurus]] and [[Auriga (constellation)|Auriga]],{{refn|Based on Minor Planet Center online Minor Planet Ephemeris Service: March 1, 1930: RA: 05h51m, Dec: +29.0.|group=lower-alpha}} at an apparent magnitude of 16.0.<ref name="Horizons" /> This position, however, was also very near the [[Milky Way]], and Makemake would have been almost impossible to find against the dense background of stars. Tombaugh continued searching for some years after the discovery of Pluto,<ref>{{cite web|title=Clyde W. Tombaugh|work=New Mexico Museum of Space History|url = http://www.nmspacemuseum.org/halloffame/detail.php?id=51|accessdate=2008-06-29}}</ref> but he did not find Makemake or any other [[trans-Neptunian object]]s.

=== Name ===
The [[Provisional designation in astronomy|provisional designation]] {{mp|2005 FY|9}} was given to Makemake when the discovery was made public. Before that, the discovery team used the codename "[[Easter Bunny|Easterbunny]]" for the object, because of its discovery shortly after [[Easter]].<ref name="brownblog" />

⚫
In July 2008, in accordance with IAU rules for classical Kuiper belt objects, {{mp|2005 FY|9}} was given the name of a [[creator deity]].<ref name="Slashdot, July 13, 2008">{{cite web | url=http://science.slashdot.org/story/08/07/14/0147250/makemake-becomes-the-newest-dwarf-planet | title=Makemake Becomes the Newest Dwarf Planet | publisher=[[Slashdot]] | date=July 13, 2008 | accessdate=November 23, 2012}}</ref><!-- This rule is not mentioned in Mike Brown's story --> The name of [[Makemake (deity)|Makemake]], the creator of humanity and god of fertility in the myths of the [[Rapa Nui people|Rapa Nui]], the native people of [[Easter Island]],<ref name="name">{{cite web|date=2008-11-07 <!--11:42:58-->|title=Dwarf Planets and their Systems|work= Working Group for Planetary System Nomenclature (WGPSN)|url = http://planetarynames.wr.usgs.gov/append7.html#DwarfPlanets| accessdate=2008-07-13| publisher= U.S. Geological Survey}}</ref> was chosen in part to preserve the object's connection with Easter.<ref name="brownblog">{{cite web|title=Mike Brown's Planets: What's in a name? (part 2) | last = Brown | first = Mike | publisher=California Institute of Technology|date=2008|url = http://www.mikebrownsplanets.com/2008/07/whats-in-name-part-2.html|accessdate=2008-07-14}}</ref>


== Orbit and classification ==
== Orbit and classification ==
[[File:Quaoar Haumea Makemake orbits 2018.png|left|320px|thumb|Makemake's orbit outside of Neptune is similar to [[Haumea]]'s. The positions are as of 1 January 2018.]]
[[File:Quaoar Haumea Makemake orbits 2018.png|left|320px|thumb|Makemake's orbit outside of Neptune is similar to [[Haumea]]'s. The positions are as of 1 January 2018.]]


[[File:TheKuiperBelt Orbits 2003EL61 2005FY9.svg|thumb|320px|Orbits of Makemake (blue), {{dp|Haumea}} (green), contrasted with the orbit of Pluto (red) and the ecliptic (grey). The [[perihelion|perihelia]] (q)<ref name="jpldata">{{cite web|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=136472|title=JPL Small-Body Database Browser: 136472 Makemake ({{mp|2005 FY|9}})|work=NASA Jet Propulsion Laboratory|type=2014-07-08 last obs|accessdate=2015-08-27}}</ref> and the [[aphelion|aphelia]] (Q) are marked with the dates of passage. The positions on April 2006 are marked with the spheres illustrating relative sizes and differences in [[Albedo#Astronomical albedo|albedo]] and colour.]]
[[File:TheKuiperBelt Orbits 2003EL61 2005FY9.svg|thumb|320px|Orbits of Makemake (blue), {{dp|Haumea}} (green), contrasted with the orbit of Pluto (red) and the ecliptic (grey). The [[perihelion|perihelia]] (q)<ref name=jpldata/> and the [[aphelion|aphelia]] (Q) are marked with the dates of passage. The positions on April 2006 are marked with the spheres illustrating relative sizes and differences in [[Albedo#Astronomical albedo|albedo]] and colour.]]


{{as of|December 2015}}, Makemake is {{convert|52.4|AU|km|lk=in|abbr=on}} from the Sun,<ref name="AstDys">{{cite web
{{as of|December 2015}}, Makemake is {{convert|52.4|AU|km|lk=in|abbr=on}} from the Sun,<ref name="AstDys">{{cite web
Line 14: Line 97:
|publisher=Department of Mathematics, University of Pisa, Italy
|publisher=Department of Mathematics, University of Pisa, Italy
|url = http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=Makemake
|url = http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=Makemake
|accessdate=2015-12-30}}</ref><ref name="Horizons">{{cite web|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2005FY9|title=Asteroid 136472 Makemake (2005 FY9)|work=HORIZONS Web-Interface|publisher=JPL Solar System Dynamics|accessdate=2015-12-30}}</ref> almost as far from the Sun as it ever reaches on its orbit.<ref name="brown"/> Makemake follows an orbit very similar to that of {{dp|Haumea}}: highly [[orbital inclination|inclined]] at 29° and a moderate [[orbital eccentricity|eccentricity]] of about 0.16.<ref name="Tegler" /> Nevertheless, Makemake's orbit is slightly farther from the Sun in terms of both the [[Semi-major and semi-minor axes|semi-major axis]] and [[apsis|perihelion]]. Its [[orbital period]] is nearly 310&nbsp;years,<ref name="Buie">{{cite web|author=Marc W. Buie |author-link=Marc W. Buie|date=2008-04-05|title=Orbit Fit and Astrometric record for 136472|publisher=SwRI (Space Science Department)|url = http://www.boulder.swri.edu/~buie/kbo/astrom/136472.html|accessdate=2008-07-13}}</ref> more than Pluto's 248&nbsp;years and Haumea's 283&nbsp;years. Both Makemake and Haumea are currently far from the [[ecliptic]]—the angular distance is almost 29°. Makemake is approaching its 2033 [[apsis|aphelion]],<ref name="Horizons" /> whereas Haumea passed its aphelion in early 1992.<ref>{{cite web| title = Asteroid 136108 (2003 EL61)
|accessdate=2015-12-30}}</ref><ref name="Horizons" /> almost as far from the Sun as it ever reaches on its orbit.<ref name="brown"/> Makemake follows an orbit very similar to that of {{dp|Haumea}}: highly [[orbital inclination|inclined]] at 29° and a moderate [[orbital eccentricity|eccentricity]] of about 0.16.<ref name="Tegler" /> Nevertheless, Makemake's orbit is slightly farther from the Sun in terms of both the [[Semi-major and semi-minor axes|semi-major axis]] and [[apsis|perihelion]]. Its [[orbital period]] is nearly 310&nbsp;years,<ref name="Buie">{{cite web|author=Marc W. Buie |author-link=Marc W. Buie|date=2008-04-05|title=Orbit Fit and Astrometric record for 136472|publisher=SwRI (Space Science Department)|url = http://www.boulder.swri.edu/~buie/kbo/astrom/136472.html|accessdate=2008-07-13}}</ref> more than Pluto's 248&nbsp;years and Haumea's 283&nbsp;years. Both Makemake and Haumea are currently far from the [[ecliptic]]—the angular distance is almost 29°. Makemake is approaching its 2033 [[apsis|aphelion]],<ref name="Horizons" /> whereas Haumea passed its aphelion in early 1992.<ref>{{cite web| title = Asteroid 136108 (2003 EL61)
|work=HORIZONS Web-Interface|publisher=JPL Solar System Dynamics
|work=HORIZONS Web-Interface|publisher=JPL Solar System Dynamics
|url = http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2003EL61|accessdate=2008-08-04}}</ref>
|url = http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2003EL61|accessdate=2008-08-04}}</ref>

Revision as of 00:56, 6 February 2019

This article is about the dwarf planet. For the Rapa Nui god, see Makemake (deity). For other uses, see Makemake (disambiguation).
Makemake
Makemake and its moon (indicated by the arrow), as seen by the Hubble Space Telescope
Discovery
Discovered by
Discovery dateMarch 31, 2005
Designations
(136472) Makemake
Pronunciation/ˌmækiˈmæki/, /ˌmɑːkiˈmɑːki/ or /ˌmɑːkeɪˈmɑːkeɪ/ ⓘ[a]
Named after
Makemake
2005 FY9
Dwarf planet
cubewano[5]
scattered-near[b]
AdjectivesMakemakean
Orbital characteristics[6]
Epoch JD 2457000.5 (9 December 2014)
Earliest precovery dateJanuary 29, 1955
Aphelion
  • 52.840 AU
  • 7.9048×109 km
Perihelion
  • 38.590 AU
  • 5.7730×109 km
  • 45.715 AU
  • 6.8389×109 km
Eccentricity0.15586
309.09 yr (112,897 d)
4.419 km/s
15
Inclination29.00685°
79.3659°
297.240°
Known satellites1
Physical characteristics
Dimensions
  • (1434+48
    −18    ) × (1420+18
    −24     km)    [7]
  • (1502±45) × (1430±9) km[8]
  • 715+19
    −11     km    [7]
  • 739±17 km[8]
Flattening0.05[c]
(6.9±0.3)×106 km2[d][9]
Volume(1.7±0.1)×109 km3[d][10]
Mass< 4.4 × 1021 kg
< (0.000736726 Earths)
Mean density
1.4–3.2 g/cm3[7] <3.05 g/cm3
7.771±0.003 h[11]
0.81+0.03
−0.05[7]
Temperature32–36 K (single-terrain model)
40–44 K (two-terrain model)[8]
B−V=0.83, V−R=0.5[12]
17.0 (opposition)[13][14]
−0.3[6]

Makemake (minor-planet designation 136472 Makemake) is a dwarf planet (and plutoid) and perhaps the largest Kuiper belt[e] object in the classical population,[b] with a diameter approximately two-thirds that of Pluto.[19][20] Makemake has one known satellite, S/2015 (136472) 1.[21] Makemake's extremely low average temperature, about 30 K (−243.2 °C), means its surface is covered with methane, ethane, and possibly nitrogen ices.[16]

Makemake was discovered on March 31, 2005, by a team led by Michael E. Brown, and announced on July 29, 2005. Initially, it was known as 2005 FY9 and later given the minor-planet number 136472. Makemake was recognized as a dwarf planet by the International Astronomical Union (IAU) in July 2008.[20][22][23][24] Its name derives from Makemake in the mythology of the Rapa Nui people of Easter Island.[20]

History

Discovery

Makemake was discovered on March 31, 2005, by a team at the Palomar Observatory, led by Michael E. Brown,[6] and was announced to the public on July 29, 2005. The team had planned to delay announcing their discoveries of the bright objects Makemake and Eris until further observations and calculations were complete, but announced them both on July 29 when the discovery of another large object they had been tracking, Haumea, was controversially announced on July 27 by a different team in Spain.[25]

Despite its relative brightness (it is about a fifth as bright as Pluto),[f] Makemake was not discovered until after many much fainter Kuiper belt objects. Most searches for minor planets are conducted relatively close to the ecliptic (the region of the sky that the Sun, Moon and planets appear to lie in, as seen from Earth), due to the greater likelihood of finding objects there. It probably escaped detection during the earlier surveys due to its relatively high orbital inclination, and the fact that it was at its farthest distance from the ecliptic at the time of its discovery, in the northern constellation of Coma Berenices.[14]

Precovery images have been identified back to January 29, 1955.[6]

Besides Pluto, Makemake is the only other dwarf planet that was bright enough that Clyde Tombaugh could have detected it during his search for trans-Neptunian planets around 1930.[27] At the time of Tombaugh's survey, Makemake was only a few degrees from the ecliptic, near the border of Taurus and Auriga,[g] at an apparent magnitude of 16.0.[14] This position, however, was also very near the Milky Way, and Makemake would have been almost impossible to find against the dense background of stars. Tombaugh continued searching for some years after the discovery of Pluto,[28] but he did not find Makemake or any other trans-Neptunian objects.

Name

The provisional designation 2005 FY9 was given to Makemake when the discovery was made public. Before that, the discovery team used the codename "Easterbunny" for the object, because of its discovery shortly after Easter.[1]

In July 2008, in accordance with IAU rules for classical Kuiper belt objects, 2005 FY9 was given the name of a creator deity.[29] The name of Makemake, the creator of humanity and god of fertility in the myths of the Rapa Nui, the native people of Easter Island,[23] was chosen in part to preserve the object's connection with Easter.[1]

Orbit and classification

Makemake's orbit outside of Neptune is similar to Haumea's. The positions are as of 1 January 2018.
Orbits of Makemake (blue), Haumea (green), contrasted with the orbit of Pluto (red) and the ecliptic (grey). The perihelia (q)[6] and the aphelia (Q) are marked with the dates of passage. The positions on April 2006 are marked with the spheres illustrating relative sizes and differences in albedo and colour.

As of December 2015, Makemake is 52.4 AU (7.84×109 km) from the Sun,[13][14] almost as far from the Sun as it ever reaches on its orbit.[16] Makemake follows an orbit very similar to that of Haumea: highly inclined at 29° and a moderate eccentricity of about 0.16.[30] Nevertheless, Makemake's orbit is slightly farther from the Sun in terms of both the semi-major axis and perihelion. Its orbital period is nearly 310 years,[15] more than Pluto's 248 years and Haumea's 283 years. Both Makemake and Haumea are currently far from the ecliptic—the angular distance is almost 29°. Makemake is approaching its 2033 aphelion,[14] whereas Haumea passed its aphelion in early 1992.[31]

Makemake is a classical Kuiper belt object (KBO),[5][b] which means its orbit lies far enough from Neptune to remain stable over the age of the Solar System.[32][33] Unlike plutinos, which can cross Neptune's orbit due to their 2:3 resonance with the planet, the classical objects have perihelia further from the Sun, free from Neptune's perturbation.[32] Such objects have relatively low eccentricities (e below 0.2) and orbit the Sun in much the same way the planets do. Makemake, however, is a member of the "dynamically hot" class of classical KBOs, meaning that it has a high inclination compared to others in its population.[34] Makemake is, probably coincidentally, near the 11:6 resonance with Neptune.[35]

Physical characteristics

Brightness, size, and rotation

Makemake (apparent magnitude 16.9)

Makemake is currently visually the second-brightest Kuiper belt object after Pluto,[27] having a March opposition apparent magnitude of 17.0[13] in the constellation Coma Berenices.[14] This is bright enough to be visible using a high-end amateur telescope.

Combining the detection in infrared by the Spitzer Space Telescope and Herschel Space Telescope with the similarities of spectrum with Pluto yielded an estimated diameter from 1,360 to 1,480 km.[19] From the 2011 stellar occultation by Makemake, its dimensions have been initially measured to be (1502 ± 45) × (1430 ± 9) km. However, this analysis of the occultation data was later reanalyzed,[7] which led to the dimension estimate of (1434+48
−18) × (1420+18
−24 km) without a pole-orientation constraint.[7] This means that Makemake is slightly larger than Haumea, making it likely the fourth-largest-known trans-Neptunian object after Pluto, Eris, and 2007 OR10, though the error bars with the latter overlap.[30] Makemake was the fourth dwarf planet recognized, because it has a bright V-band absolute magnitude of −0.44.[6] Makemake has a high geometrical albedo of 0.81+0.01
−0.02.[7]

The rotation period of Makemake is estimated at 7.77 hours. Its lightcurve amplitude is small, only 0.03 mag.[7] This was thought to be due to Makemake currently being viewed pole on from Earth; however, S/2015 (136472) 1's orbital plane (which is probably orbiting with little inclination relative to Makemake's equator due to tides resulting from its rapid rotation) is edge-on from Earth, implying that Makemake is really being viewed equator-on.[36]

EarthMoonCharonCharonNixNixKerberosKerberosStyxStyxHydraHydraPlutoPlutoDysnomiaDysnomiaErisErisNamakaNamakaHi'iakaHi'iakaHaumeaHaumeaMakemakeMakemakeMK2MK2XiangliuXiangliuGonggongGonggongWeywotWeywotQuaoarQuaoarSednaSednaVanthVanthOrcusOrcusActaeaActaeaSalaciaSalacia2002 MS42002 MS4File:10 Largest Trans-Neptunian objects (TNOS).png
Artistic comparison of Pluto, Eris, Makemake, Haumea, Gonggong (2007 OR10), Sedna, Quaoar, Orcus, 2002 MS4, and Salacia.

Spectra and surface

Like Pluto, Makemake appears red in the visible spectrum, and significantly redder than the surface of Eris (see colour comparison of TNOs).[37] The near-infrared spectrum is marked by the presence of the broad methane (CH4) absorption bands. Methane is observed also on Pluto and Eris, but its spectral signature is much weaker.[37]

Spectral analysis of Makemake's surface revealed that methane must be present in the form of large grains at least one centimetre in size.[16] In addition to methane, large amounts of ethane and tholins as well as smaller amounts of ethylene, acetylene and high-mass alkanes (like propane) may be present, most likely created by photolysis of methane by solar radiation.[16][38] The tholins are probably responsible for the red color of the visible spectrum. Although evidence exists for the presence of nitrogen ice on its surface, at least mixed with other ices, there is nowhere near the same level of nitrogen as on Pluto and Triton, where it composes more than 98 percent of the crust. The relative lack of nitrogen ice suggests that its supply of nitrogen has somehow been depleted over the age of the Solar System.[16][39][40]

The far-infrared (24–70 μm) and submillimeter (70–500 μm) photometry performed by Spitzer and Herschel telescopes revealed that the surface of Makemake is not homogeneous. Although the majority of it is covered by nitrogen and methane ices, where the albedo ranges from 78 to 90%, there are small patches of dark terrain whose albedo is only 2 to 12%, and that make up 3 to 7% of the surface.[19] These studies were made before S/2015 (136472) 1 was discovered; thus, these small dark patches may actually have been the dark surface of the satellite rather than any actual surface features on Makemake[36].However, some experiments have refuted these studies. Spectroscopic studies, collected from 2005 to 2008 using the William Herschel Telescope (La Palma, Spain) were analyzed together with other spectra in the literature, as of 2014. They show some degree of variation in the spectral slope, which would be associated with different abundance of the complex organic materials, byproduct of the irradiation of the ices present on the surface of Makemake. However, the relative ratio of the two dominant icy species, methane and nitrogen, remains quite stable on the surface revealing a low degree of inhomogeneity in the ice component.[41] These results have been recently confirmed when the Telescopio Nazionale Galileo acquired new visible and near infra-red spectra for Makemake, between 2006 and 2013, that covered nearly 80% of its surface; this study found that the variation in the spectra were negligible, suggesting that Makemake's surface may indeed be homogenous.[42]

Atmosphere

Makemake was expected to have an atmosphere similar to that of Pluto but with a lower surface pressure. However, on 23 April 2011 Makemake passed in front of an 18th-magnitude star and abruptly blocked its light.[43] The results showed that Makemake presently lacks a substantial atmosphere and placed an upper limit of 4–12 nanobar on the pressure at its surface.[8]

The presence of methane and possibly nitrogen suggests that Makemake could have a transient atmosphere similar to that of Pluto near its perihelion.[37] Nitrogen, if present, will be the dominant component of it.[16] The existence of an atmosphere also provides a natural explanation for the nitrogen depletion: because the gravity of Makemake is weaker than that of Pluto, Eris and Triton, a large amount of nitrogen was probably lost via atmospheric escape; methane is lighter than nitrogen, but has significantly lower vapor pressure at temperatures prevalent at the surface of Makemake (32–36 K),[8] which hinders its escape; the result of this process is a higher relative abundance of methane.[44] However, studies of Pluto's atmosphere by New Horizons suggest that methane, not nitrogen, is the dominant escaping gas, suggesting that the reasons for Makemake's absence of nitrogen may be more complicated.[45][46]

Satellite

S/2015 (136472) 1
Makemake and its moon
Discovery[47]
Discovered by
Discovery dateApril 2015
Designations
Pronunciation//
MK 2 (unofficial)[48]
Orbital characteristics[47]
21,000 km to 300,000 km
12.4 days to 660 days
Satellite ofMakemake
Physical characteristics
~87.5km
~0.1
25.1

S/2015 (136472) 1, nicknamed MK 2 by the discovery team,[48] is the only known moon of Makemake.[47][50][51] It is estimated to be 175 km (110 mi) in diameter (for an assumed albedo of 4%) and has a semi-major axis at least 21,000 km (13,000 mi) from Makemake.[52] Its orbital period is ≥ 12 days (the minimum values are those for a circular orbit; the actual orbital eccentricity is unknown).[53][47][51] Observations leading to its discovery occurred in April 2015, using the Hubble Space Telescope's Wide Field Camera 3, and its discovery was announced on 26 April 2016.[48]

Most other large trans-Neptunian objects have at least one known satellite: Eris has one, Haumea has two, Pluto has five, and 2007 OR10 has one satellite. 10% to 20% of all trans-Neptunian objects are expected to have one or more satellites.[27] Because satellites offer a simple method to measure an object's mass, Makemake's satellite should lead to better estimates of its mass.[27]

Observations

A preliminary examination of the imagery suggests that S/2015 (136472) 1 has a reflectivity similar to charcoal, making it an extremely dark object. This is somewhat surprising because Makemake is the second-brightest-known object in the Kuiper belt. One hypothesis to explain this is that its gravity is not strong enough to prevent bright but volatile ices from being lost to space when it is heated by the distant Sun.[54]

Further observations will be needed in order to determine S/2015 (136472) 1's orbit. If it is circular, it would suggest that S/2015 (136472) 1 was formed by an ancient impact event, but if it is elliptical, it suggests that it may have been captured.[54]

Alex Parker, the leader of the team that performed the analysis of the images at the Southwest Research Institute, said that S/2015 (136472) 1's orbit appears to be aligned edge-on to Earth-based observatories. This would make it much more difficult to detect because it would be lost in Makemake's glare much of the time, which, along with its dark surface, would contribute to previous surveys failing to observe it.[54]

Exploration

It was calculated that a flyby mission to Makemake could take just over 16 years using a Jupiter gravity assist, based on a launch date of 21 August 2024 or 24 August 2036. Makemake would be approximately 52 AU from the Sun when the spacecraft arrives.[55]

See also

Template:Wikipedia books

Notes

  1. ^ The Rapa Nui pronunciation is [ˈmakeˈmake], which is approximated in English as US: /ˌmɑːkiˈmɑːki/ MAH-kee-MAH-kee,[1] UK: /ˈmækiˈmæki/ MAK-ee-MAK-ee, or as /ˌmɑːkeɪˈmɑːkeɪ/ MAH-kay-MAH-kay.[2][3] The first is an anglicized pronunciation; the second is more Polynesian, and is used by Brown and his students.[4]
  2. ^ a b c Astronomers Mike Brown, David Jewitt and Marc Buie classify Makemake as a near scattered object but the Minor Planet Center, from which Wikipedia draws most of its definitions for the trans-Neptunian population, places it among the main Kuiper belt population.[15][16][17][18]
  3. ^ Calculated using (a−b)/a and the dimensions from [8]
  4. ^ a b Calculated using the dimensions from [8] assuming an oblate spheroid.
  5. ^ The Kuiper Belt is a ring of bodies beyond Neptune.
  6. ^ It has an apparent magnitude in opposition of 16.7 vs. 15 for Pluto.[26]
  7. ^ Based on Minor Planet Center online Minor Planet Ephemeris Service: March 1, 1930: RA: 05h51m, Dec: +29.0.

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