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{{Infobox planet
{{Infobox planet
|width = 25em
| minorplanet = yes
|background = #FFFFC0
| name = 1866 Sisyphus
| background = #FFC2E0
| name=1866 Sisyphus
| image =
| discoverer=[[Paul Wild (Swiss astronomer)|Paul Wild]]
| caption =
| discovered=December 5, 1972
| discovery_ref = &thinsp;<ref name="jpldata" />
| alt_names=1972 XA
| discovered = 5 December 1972
| named_after = [[Sisyphus]]
| discoverer = [[Paul Wild (Swiss astronomer)|P. Wild]]
| mp_category=[[Apollo asteroid|Apollo]], [[Mars-crosser asteroid|Mars crosser]]
| discovery_site = [[Zimmerwald Observatory|Zimmerwald Obs.]]
| epoch=December 1, 2005 ([[Julian day|JD]] 2453705.5)
| mp_name = 1866 Sisyphus
| semimajor=283.343 [[Giga|G]]m<br>(1.894 [[Astronomical unit|AU]])
| alt_names = 1972 XA
| perihelion=130.751 Gm<br>(0.874 AU)
| named_after = [[Sisyphus]]<br />{{small|(Greek mythology)}}<ref name="springer" />
| aphelion=435.936 Gm<br>(2.914 AU)
| mp_category = [[List of Apollo asteroids|Apollo]], [[Near-Earth object|NEO]]<br /> [[Mars-crosser]]
| eccentricity=0.539
| orbit_ref = &thinsp;<ref name="jpldata" />
| period=952.094 d(2.607 [[Julian year (astronomy)|a]])
| epoch = 27 June 2015 ([[Julian day|JD]] 2457200.5)
| inclination=41.181°
| uncertainty = 0
| asc_node=63.600°
| observation_arc = {{nowrap|60.35 yr (22,042 days)}}
| arg_peri=293.033°
| aphelion = 2.9133 [[Astronomical unit|AU]]
| earth_moid = 0.103 AU
| perihelion = 0.8742 AU
| mean_anomaly=261.365°
| semimajor = 1.8938 AU
| avg_speed=19.977 km/s
| eccentricity = 0.5383
| dimensions=8.48 ± 1.27 km
| period = 2.61 [[Julian year (astronomy)|yr]] (952 days)
| mass=
| mean_anomaly = 143.30[[degree (angle)|°]]
| density= 1.6 g/cm<sup>3</sup> (estimate)
| inclination = 41.185°
| surface_grav=
| asc_node = 63.533°
| escape_velocity=
| arg_peri = 293.06°
| rotation= 2.7 h<br> 2.4 h (JPL)
| moid = 0.1045 AU
| spectral_type=S
| dimensions = 8.48 km<ref name="Delbo-2003" /><br />{{val|5.72|0.07}} km<ref name="AKARI" /><br />{{val|6.597|0.189}} km<ref name="WISE" /><br />{{val|6.859|}} km<ref name="Pravec-2012b" /><br />{{val|8|}} km{{efn|name=lcdb-weblink}}<br />{{val|8.9|}} km<ref name="Delbo-2011" />
| abs_magnitude=12.237 <br> 12.4 (JPL)
| rotation = 2.400 [[hour|h]]<ref name="Schober-1993" />{{efn|name=lcdb-weblink}}<br />{{val|2.7|}} h<ref name="Szabo-2001b" /><br />{{val|2.401|0.001}} h<ref name="Stephens-2011j" /><br />{{val|2.424|0.001}} h<ref name="geneva-obs" />
| albedo= 0.15 ± 0.045
| albedo = 0.15<ref name="Delbo-2003" /><br />{{val|0.19|0.07}}<ref name="Mainzer-2011" /><br />{{val|0.360|0.010}}<ref name="AKARI" /><br />{{val|0.255|0.049}}<ref name="WISE" /><br />{{val|0.3719|}}<ref name="Pravec-2012b" /><br />{{val|0.14|}}<ref name="Delbo-2011" />
| single_temperature=
| spectral_type = [[SMASS classification|SMASS]] = [[S-type asteroid|S]]&thinsp;<ref name="jpldata" /><br />[[S-type asteroid|S]]&thinsp;<ref name="lcdb" />
| abs_magnitude = 12.4<ref name="jpldata" />
}}
}}
'''1866 Sisyphus''' ({{IPAc-en|ˈ|s|ɪ|s|ɨ|f|ə|s}} {{respell|SIS|i-fəs}}) is a binary<ref>http://echo.jpl.nasa.gov/~lance/binary.neas.html</ref> [[Apollo asteroid]] which, at approximately 9&nbsp;km in diameter, is the largest of the [[Earth-crosser asteroid|Earth-crossing asteroids]].<ref name="JPL-NEO-H13"/> It is comparable in size to the [[Chicxulub Crater|Chicxulub]] object whose impact may have [[Cretaceous–Paleogene extinction event|killed off]] the [[dinosaur]]s.


'''1866 Sisyphus''' ({{IPAc-en|ˈ|s|ɪ|s|ɨ|f|ə|s}} {{respell|SIS|i-fəs}}), provisional designation 1972 XA, is stony, [[binary asteroid]], classified as [[near-Earth object]]. It measures about 7 kilometers in diameter and is the largest member of the [[Apollo asteroid]]s, a subgroup of near-Earth asteroids which cross the orbit of Earth. It was discovered by astronomer [[Paul Wild (Swiss astronomer)|Paul Wild]] at [[Zimmerwald Observatory]] near Bern, Switzerland on 5 December 1972.<ref name="MPC-Sisyphus" /><ref name="JPL-binary-neas" />
Sisyphus was discovered in 1972 by [[Paul Wild (Swiss astronomer)|Paul Wild]], and named after the [[Sisyphus]] of [[Greek mythology]].


The [[S-type asteroid|S-type]] asteroid orbits the Sun at a distance of 0.9–2.9&nbsp;[[Astronomical unit|AU]] once every 2 years and 7 months (952 days). It has a [[rotation period]] of 2.4 hours and a [[geometric albedo]] of 0.150. Its orbit is highly [[orbital eccentricity|eccentric]] (0.54) and [[orbital inclination|tilted]] by 41 degrees to the plane of the [[ecliptic]]. The asteroid's ''Earth minimum orbit intersection distance'' ([[Minimum orbit intersection distance|MOID]]) is {{convert|0.1045|AU|km mi|abbr=on|lk=on}}.<ref name="jpldata" />
It will pass {{convert|0.11581|AU|km mi|abbr=on|lk=on}} from Earth on November 24, 2071,<ref name=jpl-close/> and will peak at roughly [[apparent magnitude]] 9.3 on November 26, 2071.<ref name="NEODyS-2071"/> When it was discovered it peaked at magnitude 9.0 on November 25, 1972. It is one of the brightest near-Earth asteroids.


In 1985, this object was detected with [[radar]] from the [[Arecibo Observatory]] at a distance of 0.25 [[Astronomical unit|AU]]. The measured [[radar cross-section]] was 8&nbsp;km<sup>2</sup>.<ref name="Ostro1991"/> During the radar observations, a small satellite was detected, although its existence was not reported until December 2007. As a result, little is known about the moon.
In 1985, this object was detected with [[radar]] from the [[Arecibo Observatory]] at a distance of 0.25&nbsp;AU. The measured [[radar cross-section]] was 8 square kilometers.<ref name="Ostro1991"/> During the radar observations, a small satellite was detected, although its existence was not reported until December 2007. As a result, little is known about the moon.


The asteroid is named after the [[Sisyphus]] of Greek mythology and refers to the cruel king of Ephyra, punished by being given the task of rolling a large stone up to a hill in the [[Greek underworld|underworld]], only to have it roll down again each time he neared the top.<ref name="springer" />
Larger near-Earth asteroids include: [[1036 Ganymed]] (32&nbsp;km), [[3552 Don Quixote]] (19&nbsp;km), [[433 Eros]] (17&nbsp;km), and [[4954 Eric]] (10.8&nbsp;km).


''Sisyphus'' will pass {{convert|0.11581|AU|km mi|abbr=on|lk=off}} from Earth on November 24, 2071,<ref name=jpl-close/> and will peak at roughly [[apparent magnitude]] 9.3 on November 26, 2071.<ref name="NEODyS-2071"/> When it was discovered it peaked at magnitude 9.0 on November 25, 1972. It is one of the brightest near-Earth asteroids. With a measured mean diameter in the range of 5.7–8.9 kilometers, it the largest of the [[Earth-crosser asteroid|Earth-crossing asteroids]], comparable in size to the [[Chicxulub Crater|Chicxulub]] object whose impact may have [[Cretaceous–Paleogene extinction event|extinct]] the dinosaurs.<ref name="JPL-NEO-H13"/> Larger near-Earth asteroids which are neither classified as Apollos nor Earth-crossers include [[1036 Ganymed]] (32&nbsp;km), [[3552 Don Quixote]] (19&nbsp;km), [[433 Eros]] (17&nbsp;km), and [[4954 Eric]] (10.8&nbsp;km).
==See also==

== See also ==
* [[Near Earth Object Camera]]
* [[Near Earth Object Camera]]
* [[Near-Earth asteroids]]
* [[Near-Earth asteroids]]
* [[Near-Earth objects]]


==References==
== References ==
{{notelist
{{Reflist|refs=
|refs=

{{efn
|name=lcdb-weblink
|1=Pravec (1998web), gives a rotation period of 2.4 hours. Benner (1985), gives a diameter of 8 kilometer. Summary figures listed at {{URL |1=http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1866%7CSisyphus}}
}}

}} <!-- end of notelist -->

{{Reflist
|refs=

<ref name="JPL-binary-neas">http://echo.jpl.nasa.gov/~lance/binary.neas.html</ref>

<ref name="Ostro1991">{{Citation
<ref name="Ostro1991">{{Citation
| last1 = Ostro
| last1 = Ostro
Line 97: Line 113:
|url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=1866&oc=500&y0=2071&m0=11&d0=11&h0=0&mi0=0&y1=2071&m1=12&d1=11&h1=0&mi1=0&ti=1.0&tiu=days
|url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=1866&oc=500&y0=2071&m0=11&d0=11&h0=0&mi0=0&y1=2071&m1=12&d1=11&h1=0&mi1=0&ti=1.0&tiu=days
|accessdate=2013-10-30}}</ref>
|accessdate=2013-10-30}}</ref>

<ref name="geneva-obs">{{cite web
|title=Asteroids and comets rotation curves – (1866) Sisyphus
|last=Behrend |first=Raoul
|publisher=Geneva Observatory
|url=http://obswww.unige.ch/~behrend/page4cou.html#001866
|accessdate=November 2015}}</ref>

<ref name="lcdb">{{cite web
|title=LCDB Data for (1866) Sisyphus
|publisher=Asteroid Lightcurve Database (LCDB)
|url=http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1866%7CSisyphus
|accessdate=November 2015}}</ref>

<ref name="jpldata">{{cite web
|type=2015-06-02 last obs.
|title=JPL Small-Body Database Browser: 1866 Sisyphus (1972 XA)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001866
|publisher=Jet Propulsion Laboratory
|accessdate=November 2015}}</ref>

<ref name="springer">{{cite book
|url=http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1867
|title=Dictionary of Minor Planet Names – (1866) Sisyphus
|last=Schmadel |first=Lutz D.
|publisher=Springer Berlin Heidelberg
|page=150
|date=2003
|isbn=978-3-540-29925-7
|accessdate=November 2015}}</ref>

<ref name="MPC-Sisyphus">{{cite web
|title=1866 Sisyphus (1972 XA)
|work=Minor Planet Center
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=1866
|accessdate=November 2015}}</ref>

<ref name="Delbo-2003">{{cite journal
|authors = Delb&#243;, Marco; Harris, Alan W.; Binzel, Richard P.; Pravec, Petr; Davies, John K.
|date = November 2003
|title = Keck observations of near-Earth asteroids in the thermal infrared
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003Icar..166..116D
|journal = Icarus
|publisher =
|volume = 166
|issue = 1
|page = 116&ndash;130.
|bibcode = 2003Icar..166..116D
|doi = 10.1016/j.icarus.2003.07.002
|access-date= November 2015}}</ref>

<ref name="AKARI">{{cite journal
|authors = Usui, Fumihiko; Kuroda, Daisuke; M&#252;ller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; Kataza, Hirokazu; Takita, Satoshi; Oyabu, Shinki; Ueno, Munetaka; Matsuhara, Hideo; Onaka, Takashi
|date = October 2011
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U
|journal = Publications of the Astronomical Society of Japan
|publisher =
|volume = 63
|issue = 5
|pages = 1117&ndash;1138
|bibcode = 2011PASJ...63.1117U
|doi = 10.1093/pasj/63.5.1117
|access-date= November 2015}}</ref>

<ref name="WISE">{{cite journal
|authors = Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; McMillan, R. S.; Spahr, T.; Cutri, R. M.; Wright, E.; Watkins, J.; Mo, W.; Maleszewski, C.
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|journal = The Astrophysical Journal
|publisher =
|volume = 741
|issue = 2
|pages = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|access-date= November 2015}}</ref>

<ref name="Pravec-2012b">{{cite journal
|authors = Pravec, Petr; Harris, Alan W.; Kusnir&#225;k, Peter; Gal&#225;d, Adri&#225;n; Hornoch, Kamil
|date = September 2012
|title = Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P
|journal = Icarus
|publisher =
|volume = 221
|issue = 1
|page = 365&ndash;387.
|bibcode = 2012Icar..221..365P
|doi = 10.1016/j.icarus.2012.07.026
|access-date= November 2015}}</ref>

<ref name="Delbo-2011">{{cite journal
|authors = Delbo, Marco; Walsh, Kevin; Mueller, Michael; Harris, Alan W.; Howell, Ellen S.
|date = March 2011
|title = The cool surfaces of binary near-Earth asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011Icar..212..138D
|journal = Icarus
|publisher =
|volume = 212
|issue = 1
|page = 138&ndash;148.
|bibcode = 2011Icar..212..138D
|doi = 10.1016/j.icarus.2010.12.011
|access-date= November 2015}}</ref>

<ref name="Schober-1993">{{cite journal
|authors = Schober, H. J.; Erikson, A.; Hahn, G.; Lagerkvist, C. I.; Oja, T.
|date = November 1993
|title = Physical Studies of Asteroids. Part XXVI. Rotation and Photoelectric Photometry of Asteroids 323, 350, 582, 1021 and 1866
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1993A&AS..101..499S
|journal = Astronomy and Astrophysics Supplement
|publisher =
|volume = 101
|issue = 3
|page = 507
|bibcode = 1993A&AS..101..499S
|doi =
|access-date= November 2015}}</ref>

<ref name="Szabo-2001b">{{cite journal
|authors = Szab&#243;, Gy. M.; Cs&#225;k, B.; S&#225;rneczky, K.; Kiss, L. L.
|date = August 2001
|title = Photometric observations of 9 Near-Earth Objects
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001A&A...375..285S
|journal = Astronomy and Astrophysics
|publisher =
|volume =
|issue =
|page =
|bibcode = 2001A&A...375..285S
|doi = 10.1051/0004-6361:20010813
|access-date= November 2015}}</ref>

<ref name="Stephens-2011j">{{cite journal
|authors = Stephens, Robert D.; French, Linda, M.; Warner, Brian D.; Wasserman, Lawrence H.
|date = October 2011
|title = The Curse of Sisyphus
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..212S
|journal = Bulletin of the Minor Planets
|publisher = Section of the Association of Lunar and Planetary Observers
|volume = 38
|issue = 4
|page = 212&ndash;213
|issn = 1052-8091
|bibcode = 2011MPBu...38..212S
|doi =
|access-date= November 2015}}</ref>

<ref name="Mainzer-2011">{{cite journal
|authors = Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Wright, E.; Cutri, R. M.; McMillan, R. S.; Cohen, M.; Ressler, M.; Eisenhardt, P.
|date = August 2011
|title = Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...736..100M
|journal = The Astrophysical Journal
|publisher =
|volume = 736
|issue = 2
|pages = 9
|bibcode = 2011ApJ...736..100M
|doi = 10.1088/0004-637X/736/2/100
|access-date= November 2015}}</ref>


}}
}}


==External links==
== External links ==
* [http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.0&n=1866 NeoDys entry on 1866 Sisyphus]
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [https://books.google.se/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 Geneve, Raoul Behrend
* {{JPL small body|title=1866 Sisyphus (1972 XA)|id=2001866}}
* [http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.0&n=1866 NeoDys entry on 1866 Sisyphus]
* [http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.0&n=1866 NeoDys entry on 1866 Sisyphus]
* {{JPL small body}}


{{Minor planets navigator|1865 Cerberus|1867 Deiphobus}}
{{Minor planets navigator|1865 Cerberus|1867 Deiphobus}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}


{{DEFAULTSORT:001866}}
{{DEFAULTSORT:Sisyphus}}
[[Category:Mars-crossing asteroids]]
[[Category:Mars-crossing asteroids|001866]]
[[Category:Apollo asteroids]]
[[Category:Apollo asteroids|001866]]
[[Category:S-type asteroids]]
[[Category:S-type asteroids|001866]]
[[Category:Binary asteroids]]
[[Category:Binary asteroids|001866]]
[[Category:Minor planets named from Greek mythology|Sisyphus]]
[[Category:Minor planets named from Greek mythology|Sisyphus]]
[[Category:Discoveries by Paul Wild (Swiss astronomer)]]
[[Category:Discoveries by Paul Wild (Swiss astronomer)]]

Revision as of 10:12, 6 November 2015

1866 Sisyphus
Discovery [1]
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date5 December 1972
Designations
1866 Sisyphus
Named after
Sisyphus
(Greek mythology)[2]
1972 XA
Apollo, NEO
Mars-crosser
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc60.35 yr (22,042 days)
Aphelion2.9133 AU
Perihelion0.8742 AU
1.8938 AU
Eccentricity0.5383
2.61 yr (952 days)
143.30°
Inclination41.185°
63.533°
293.06°
Earth MOID0.1045 AU
Physical characteristics
Dimensions8.48 km[3]
5.72±0.07 km[4]
6.597±0.189 km[5]
6.859 km[6]
8 km[a]
8.9 km[7]
2.400 h[8][a]
2.7 h[9]
2.401±0.001 h[10]
2.424±0.001 h[11]
0.15[3]
0.19±0.07[12]
0.360±0.010[4]
0.255±0.049[5]
0.3719[6]
0.14[7]
SMASS = S [1]
S [13]
12.4[1]

1866 Sisyphus (/ˈsɪs[invalid input: 'ɨ']fəs/ SIS-i-fəs), provisional designation 1972 XA, is stony, binary asteroid, classified as near-Earth object. It measures about 7 kilometers in diameter and is the largest member of the Apollo asteroids, a subgroup of near-Earth asteroids which cross the orbit of Earth. It was discovered by astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland on 5 December 1972.[14][15]

The S-type asteroid orbits the Sun at a distance of 0.9–2.9 AU once every 2 years and 7 months (952 days). It has a rotation period of 2.4 hours and a geometric albedo of 0.150. Its orbit is highly eccentric (0.54) and tilted by 41 degrees to the plane of the ecliptic. The asteroid's Earth minimum orbit intersection distance (MOID) is 0.1045 AU (15,630,000 km; 9,710,000 mi).[1]

In 1985, this object was detected with radar from the Arecibo Observatory at a distance of 0.25 AU. The measured radar cross-section was 8 square kilometers.[16] During the radar observations, a small satellite was detected, although its existence was not reported until December 2007. As a result, little is known about the moon.

The asteroid is named after the Sisyphus of Greek mythology and refers to the cruel king of Ephyra, punished by being given the task of rolling a large stone up to a hill in the underworld, only to have it roll down again each time he neared the top.[2]

Sisyphus will pass 0.11581 AU (17,325,000 km; 10,765,000 mi) from Earth on November 24, 2071,[17] and will peak at roughly apparent magnitude 9.3 on November 26, 2071.[18] When it was discovered it peaked at magnitude 9.0 on November 25, 1972. It is one of the brightest near-Earth asteroids. With a measured mean diameter in the range of 5.7–8.9 kilometers, it the largest of the Earth-crossing asteroids, comparable in size to the Chicxulub object whose impact may have extinct the dinosaurs.[19] Larger near-Earth asteroids which are neither classified as Apollos nor Earth-crossers include 1036 Ganymed (32 km), 3552 Don Quixote (19 km), 433 Eros (17 km), and 4954 Eric (10.8 km).

See also

References

  1. ^ a b c d e "JPL Small-Body Database Browser: 1866 Sisyphus (1972 XA)" (2015-06-02 last obs.). Jet Propulsion Laboratory. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1866) Sisyphus. Springer Berlin Heidelberg. p. 150. ISBN 978-3-540-29925-7. Retrieved November 2015. {{cite book}}: Check date values in: |accessdate= (help)
  3. ^ a b "Keck observations of near-Earth asteroids in the thermal infrared". Icarus. 166 (1): 116–130. November 2003. Bibcode:2003Icar..166..116D. doi:10.1016/j.icarus.2003.07.002. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  4. ^ a b "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. October 2011. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  5. ^ a b "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. November 2011. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  6. ^ a b "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. September 2012. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  7. ^ a b "The cool surfaces of binary near-Earth asteroids". Icarus. 212 (1): 138–148. March 2011. Bibcode:2011Icar..212..138D. doi:10.1016/j.icarus.2010.12.011. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  8. ^ "Physical Studies of Asteroids. Part XXVI. Rotation and Photoelectric Photometry of Asteroids 323, 350, 582, 1021 and 1866". Astronomy and Astrophysics Supplement. 101 (3): 507. November 1993. Bibcode:1993A&AS..101..499S. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  9. ^ "Photometric observations of 9 Near-Earth Objects". Astronomy and Astrophysics. August 2001. Bibcode:2001A&A...375..285S. doi:10.1051/0004-6361:20010813. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  10. ^ "The Curse of Sisyphus". Bulletin of the Minor Planets. 38 (4). Section of the Association of Lunar and Planetary Observers: 212–213. October 2011. Bibcode:2011MPBu...38..212S. ISSN 1052-8091. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  11. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1866) Sisyphus". Geneva Observatory. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  12. ^ "Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE". The Astrophysical Journal. 736 (2): 9. August 2011. Bibcode:2011ApJ...736..100M. doi:10.1088/0004-637X/736/2/100. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help); Unknown parameter |authors= ignored (help)
  13. ^ "LCDB Data for (1866) Sisyphus". Asteroid Lightcurve Database (LCDB). Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  14. ^ "1866 Sisyphus (1972 XA)". Minor Planet Center. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  15. ^ http://echo.jpl.nasa.gov/~lance/binary.neas.html
  16. ^ Ostro, S. J.; et al. (October 1991), "Asteroid radar astrometry", Astronomical Journal, vol. 102, pp. 1490–1502, Bibcode:1991AJ....102.1490O, doi:10.1086/115975.
  17. ^ "JPL Close-Approach Data: 1866 Sisyphus (1972 XA)" (last observation: 2013-07-26). Retrieved 2013-10-30.
  18. ^ "(1866) Sisyphus Ephemerides for November 2071". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 2013-10-30.
  19. ^ "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 2013-10-31.


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