Jump to content

1431 Luanda: Difference between revisions

From Wikipedia, the free encyclopedia
Content deleted Content added
overall revision 2017
Line 1: Line 1:
{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
| name = 1431 Luanda
| background = #FFFFC0
| background = #D6D6D6
| apsis =
| image =
| name = Luanda
| symbol =
| image_size =
| image =
| caption =
| discovery_ref = &thinsp;<ref name="jpldata" />
| caption =
| discoverer = [[Cyril Jackson (astronomer)|C. Jackson]]
| discovery_ref =
| discovery_site = Johannesburg
| discoverer = [[C. Jackson]]
| discovered = 29 July 1937
| discovery_site = [[Johannesburg]]
| mpc_name = (1431) Luanda
| discovered = 29 July 1937
| alt_names = 1937 OB{{·}}1949 KZ
| mpc_name = (1431) Luanda
| pronounced =
| alt_names = 1937 OB
| named_after = [[Luanda]]
| named_after = [[Luanda]]&thinsp;<ref name="springer" /><br />{{small|(Capital of Angola)}}
| mp_category = [[main-belt]]{{·}}{{small|([[Kirkwood gap|middle]])}}<br />[[Eunomia family|Eunomia]]&thinsp;<ref name="lcdb" /><ref name="Ferret" />
| mp_category =
| orbit_ref = &thinsp;<ref name="jpldata" />
| orbit_ref = <ref name="jpldata">{{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1431;cad=1 |title=1431 Luanda (1937 OB) |work=[[JPL Small-Body Database]] |publisher=[[NASA]]/[[Jet Propulsion Laboratory]] |access-date=27 April 2016}}</ref>
| epoch = 31 July 2016 ([[Julian day|JD]] 2457600.5)
| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5)
| uncertainty = 0
| aphelion = {{Convert|3.1013993|AU|Gm|abbr=on|lk=on}}
| observation_arc = 80.22 yr (29,300 days)
| perihelion = {{Convert|2.1426421|AU|Gm|abbr=on}}
| aphelion = 3.0989 [[Astronomical unit|AU]]
| semimajor = {{Convert|2.622021|AU|Gm|abbr=on}}
| perihelion = 2.1408 AU
| eccentricity = 0.1828279
| semimajor = 2.6199 AU
| period = 4.25 [[Julian year (astronomy)|yr]] (1550.8 [[Julian year (astronomy)|d]])
| eccentricity = 0.1829
| avg_speed =
| period = 4.24 [[Julian year (astronomy)|yr]] (1,549 days)
| inclination = 13.98962°
| mean_anomaly = 293.57[[Degree (angle)|°]]
| asc_node = 117.82518°
| mean_motion = {{Deg2DMS|0.2324|sup=ms}} / day
| mean_anomaly = 201.06917[[Degree (angle)|°]]
| arg_peri = 223.75433°
| inclination = 13.987°
| asc_node = 117.73°
| satellites =
| arg_peri = 224.19°
| dimensions =
| dimensions = {{val|13.608|1.966}} km<ref name="Masiero-2012" /><br />13.88 km {{small|(calculated)}}<ref name="lcdb" />
| mass =
| rotation = {{val|4.141|0.004}} h<ref name="geneva-obs" /><br />{{val|5.360|0.002}} [[Hour|h]]<ref name="Gil-Hutton-2003" />
| density =
| albedo = 0.21 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.360|0.347}}<ref name="Masiero-2012" />
| surface_grav =
| spectral_type = [[L-type asteroid|L]][[S-type asteroid|S]]&nbsp;<ref name="Veres-2015" />{{·}}[[S-type asteroid|S]] {{small|(assumed)}}<ref name="lcdb" />
| escape_velocity =
| abs_magnitude = 11.06<ref name="Masiero-2012" />{{·}}11.6<ref name="lcdb" />{{·}}11.7<ref name="jpldata" />{{·}}{{val|12.38|0.42}}<ref name="Veres-2015" />
| sidereal_day =
| axial_tilt =
| pole_ecliptic_lat =
| pole_ecliptic_lon =
| albedo =
| temperatures=
| temp_name1 =
| mean_temp_1 =
| max_temp_1 =
| temp_name2 =
| max_temp_2 =
| spectral_type =
| abs_magnitude = 11.7
| mean_motion = {{Deg2DMS|0.2321400|sup=ms}} / day
| observation_arc = 78.74 yr (28760 days)
| uncertainty = 0
| rotation = {{Convert|4.141|h|d|abbr=on|lk=on}}
| moid = {{Convert|1.15357|AU|Gm|abbr=on}}
| jupiter_moid = {{Convert|2.3009|AU|Gm|abbr=on}}
| tisserand = 3.339
}}
}}
'''1431 Luanda''' (1937 OB) is a [[Asteroid belt|main-belt]] [[asteroid]] discovered on July 29, 1937, by [[C. Jackson]] at [[Johannesburg]].


'''1431 Luanda''', provisional designation {{mpf|1937 OB}}, is a stony Eunomian [[asteroid]] from the central regions of the [[asteroid belt]], approximately 14 kilometers in diameter. It was discovered on 29 July 1937, by South African astronomer [[Cyril Jackson (astronomer)|Cyril Jackson]] at the [[Union Observatory]] in Johannesburg.<ref name="MPC-object" /> The asteroid was named after the city of [[Luanda]].<ref name="springer" />
==References==
{{Reflist}}
{{Refbegin}}
* Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html
{{Refend}}


== Orbit and classification ==
==External links==
*[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1431+Luanda JPL Small-Body Database Browser on 1431 Luanda]
*{{JPL small body}}


''Luanda'' is a member of the [[Eunomia family]] ({{small|[[FIN tbl#502|502]]}}),<ref name="Ferret" /> a prominent [[Asteroid family|family]] of stony [[S-type asteroid]] and the largest one in the intermediate main belt with more than 5,000 members.<ref name="Nesvorny-2014" />{{rp|23}} It orbits the Sun in the [[Kirkwood gap|central]] asteroid belt at a distance of 2.1–3.1&nbsp;[[Astronomical unit|AU]] once every 4 years and 3 months (1,549 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.18 and an [[orbital inclination|inclination]] of 14[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The body's [[observation arc]] begins with its official discovery observation at Johannesburg in 1937.<ref name="MPC-object" />
{{Minor planets navigator|1430 Somalia|number=1431|1432 Ethiopia}}

== Physical characteristics ==

''Luanda'' has been characterized as a [[L-type asteroid|L]]/[[L-type asteroid|S]]-type asteroid by [[Pan-STARRS]] photometric survey.<ref name="Veres-2015" /> The LCDB assumes it to be a common stony [[S-type asteroid]],<ref name="lcdb" /> in-line with the family's overall [[Asteroid spectral type|spectral type]].<ref name="Nesvorny-2014" />{{rp|23}}

=== Rotation period ===

In December 1997, a rotational [[lightcurve]] of ''Luanda'' was obtained from photometric observations at the [[Félix Aguilar Observatory]] in Argentina . Lightcurve analysis gave a [[rotation period]] of 5.360 hours with a brightness variation of 1.0 [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=2]]}}).<ref name="Gil-Hutton-2003" /> In January 2007, French amateur astronomer [[René Roy (astronomer)|René Roy]] obtained a period of 4.141 hours with an amplitude of 0.77 magnitude ({{small|[[LCDB quality code|U=9-]]}}).<ref name="geneva-obs" /> A high brightness amplitude indicates that the body has an elongated rather than spherical shape.

=== Diameter and albedo ===

According to the survey carried out by the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], ''Luanda'' measures 13.61 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] of 0.36.<ref name="Masiero-2012" />

The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for Eunomian asteroids of 0.21 – derived from [[15&nbsp;Eunomia]], the parent body of this family – and calculates a diameter of 13.88 kilometers based on an [[absolute magnitude]] of 11.6.<ref name="lcdb" />

== Naming ==

This [[minor planet]] was named after the city of [[Luanda]], capital of [[Angola]].<ref name="springer" /> The official naming citation was published by the [[Minor Planet Center]] on 1 February 1980 ({{small|[[Minor Planet Circulars|M.P.C.]] 5182}}).<ref name="MPC-Circulars-Archive" />

== References ==
{{reflist|30em|refs=

<ref name="jpldata">{{cite web
|type = 2017-09-30 last obs.
|title = JPL Small-Body Database Browser: 1431 Luanda (1937 OB)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001431
|publisher = Jet Propulsion Laboratory
|accessdate = 24 October 2017}}</ref>

<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (1431) Luanda
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 115
|date = 2007
|url = https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1432
|isbn = 978-3-540-00238-3
|accessdate = 24 October 2017}}</ref>

<ref name="MPC-object">{{cite web
|title = 1431 Luanda (1937 OB)
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1431
|accessdate = 24 October 2017}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 24 October 2017}}</ref>

<ref name="geneva-obs">{{cite web
|title = Asteroids and comets rotation curves – (1431) Luanda
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page4cou.html#001431
|accessdate = 24 October 2017}}</ref>

<ref name="Ferret">{{cite web
|title = Small Bodies Data Ferret
|work = Nesvorny HCM Asteroid Families V3.0
|url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action
|accessdate = 24 October 2017}}</ref>

<ref name="Nesvorny-2014">{{Cite journal
|first1 = D. |last1 = Nesvorný
|first2 = M. |last2 = Broz
|first3 = V. |last3 = Carruba
|date = December 2014
|title = Identification and Dynamical Properties of Asteroid Families
|url = https://arxiv.org/pdf/1502.01628.pdf
|journal = Asteroids IV
|pages = 297–321
|bibcode = 2015aste.book..297N
|doi = 10.2458/azu_uapress_9780816532131-ch016
|arxiv = 1502.01628
|access-date= 24 October 2017}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (1431) Luanda
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1431%7CLuanda
|accessdate = 24 October 2017}}</ref>

<ref name="Masiero-2012">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 24 October 2017}}</ref>

<ref name="Gil-Hutton-2003">{{Cite journal
|first1 = R. |last1 = Gil-Hutton
|first2 = |last2 = Cañ
|first3 = M. |last3 = ada
|date = April 2003
|title = Photometry of Fourteen Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003RMxAA..39...69G
|journal = Revista Mexicana de Astronomía y Astrofísica Vol. 39
|pages = 69–76(http://www.astroscu.unam.mx/~rmaa/)(RMxAAHomepage)
|bibcode = 2003RMxAA..39...69G
|access-date= 24 October 2017}}</ref>

<ref name="Veres-2015">{{cite journal
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = https://arxiv.org/pdf/1506.00762.pdf
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 24 October 2017}}</ref>

}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{JPL small body}}

{{Minor planets navigator |1430 Somalia |number=1431 |1432 Ethiopia}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}


{{DEFAULTSORT:Luanda}}
{{DEFAULTSORT:Luanda}}
[[Category:Main-belt asteroids|001431]]
[[Category:Eunomia asteroids|001431]]
[[Category:Numbered minor planets|001431]]
[[Category:Numbered minor planets|001431]]
[[Category:Discoveries by Cyril V. Jackson]]
[[Category:Minor planets named for places]]
[[Category:Minor planets named for places]]
[[Category:Named minor planets]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 1937|19370729]]
[[Category:Astronomical objects discovered in 1937|19370729]]
[[Category:Discoveries by Cyril V. Jackson]]


{{Beltasteroid-stub}}

Revision as of 00:49, 24 October 2017

1431 Luanda
Discovery [1]
Discovered byC. Jackson
Discovery siteJohannesburg
Discovery date29 July 1937
Designations
(1431) Luanda
Named after
Luanda[2]
(Capital of Angola)
1937 OB · 1949 KZ
main-belt · (middle)
Eunomia[3][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc80.22 yr (29,300 days)
Aphelion3.0989 AU
Perihelion2.1408 AU
2.6199 AU
Eccentricity0.1829
4.24 yr (1,549 days)
293.57°
0° 13m 56.64s / day
Inclination13.987°
117.73°
224.19°
Physical characteristics
Dimensions13.608±1.966 km[5]
13.88 km (calculated)[3]
4.141±0.004 h[6]
5.360±0.002 h[7]
0.21 (assumed)[3]
0.360±0.347[5]
LS [8] · S (assumed)[3]
11.06[5] · 11.6[3] · 11.7[1] · 12.38±0.42[8]

1431 Luanda, provisional designation 1937 OB, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 29 July 1937, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[9] The asteroid was named after the city of Luanda.[2]

Orbit and classification

Luanda is a member of the Eunomia family (502),[4] a prominent family of stony S-type asteroid and the largest one in the intermediate main belt with more than 5,000 members.[10]: 23  It orbits the Sun in the central asteroid belt at a distance of 2.1–3.1 AU once every 4 years and 3 months (1,549 days). Its orbit has an eccentricity of 0.18 and an inclination of 14° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Johannesburg in 1937.[9]

Physical characteristics

Luanda has been characterized as a L/S-type asteroid by Pan-STARRS photometric survey.[8] The LCDB assumes it to be a common stony S-type asteroid,[3] in-line with the family's overall spectral type.[10]: 23 

Rotation period

In December 1997, a rotational lightcurve of Luanda was obtained from photometric observations at the Félix Aguilar Observatory in Argentina . Lightcurve analysis gave a rotation period of 5.360 hours with a brightness variation of 1.0 magnitude (U=2).[7] In January 2007, French amateur astronomer René Roy obtained a period of 4.141 hours with an amplitude of 0.77 magnitude (U=9-).[6] A high brightness amplitude indicates that the body has an elongated rather than spherical shape.

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Luanda measures 13.61 kilometers in diameter and its surface has an albedo of 0.36.[5]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Eunomian asteroids of 0.21 – derived from 15 Eunomia, the parent body of this family – and calculates a diameter of 13.88 kilometers based on an absolute magnitude of 11.6.[3]

Naming

This minor planet was named after the city of Luanda, capital of Angola.[2] The official naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5182).[11]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1431 Luanda (1937 OB)" (2017-09-30 last obs.). Jet Propulsion Laboratory. Retrieved 24 October 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1431) Luanda. Springer Berlin Heidelberg. p. 115. ISBN 978-3-540-00238-3. Retrieved 24 October 2017.
  3. ^ a b c d e f g "LCDB Data for (1431) Luanda". Asteroid Lightcurve Database (LCDB). Retrieved 24 October 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 24 October 2017.
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 24 October 2017.
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1431) Luanda". Geneva Observatory. Retrieved 24 October 2017.
  7. ^ a b Gil-Hutton, R.; Cañ; ada, M. (April 2003). "Photometry of Fourteen Main Belt Asteroids". Revista Mexicana de Astronomía y Astrofísica Vol. 39: 69–76(http://www.astroscu.unam.mx/~rmaa/)(RMxAAHomepage). Bibcode:2003RMxAA..39...69G. Retrieved 24 October 2017.
  8. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 October 2017.
  9. ^ a b "1431 Luanda (1937 OB)". Minor Planet Center. Retrieved 24 October 2017.
  10. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 24 October 2017.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 October 2017.