1866 Sisyphus

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1866 Sisyphus
Discovery [1]
Discovered by P. Wild
Discovery site Zimmerwald Obs.
Discovery date 5 December 1972
Designations
MPC designation 1866 Sisyphus
Pronunciation /ˈsɪsfəs/ (SIS-i-fəs)
Named after
Sisyphus (Greek mythology)[2]
1972 XA
Apollo · NEO[1][3] · Mars-crosser
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 61.55 yr (22,482 days)
Aphelion 2.9134 AU
Perihelion 0.8737 AU
1.8936 AU
Eccentricity 0.5386
2.61 yr (952 days)
10.253°
0° 22m 41.88s / day
Inclination 41.202°
63.498°
293.10°
Known satellites 1 [a][4][5][6]
(Orbital period of 27.16±0.05 h)
Earth MOID 0.1036 AU · 40.4 LD
Physical characteristics
Dimensions 5.72±0.07 km[7]
6.597±0.189 km[8]
6.859 km[9]
6.86 km (taken)[10]
8 km[4][a]
8.48 km[11]
8.9 km[12]
2.3909±0.0004 h[6]
2.400 h[13]
2.4 h[b]
2.401±0.001 h[5]
2.424±0.001 h[14]
2.7 h[15]
0.14[12]
0.15[11]
0.19±0.07[16]
0.255±0.049[8]
0.360±0.010[7]
0.3719[9]
SMASS = S[1] · S[17]
11.7±0.2 (R)[b] · 12.4[1] · 12.51±0.149[9][10] · 13.0[7][8][11]

1866 Sisyphus (SIS-i-fəs), provisional designation 1972 XA, is a binary[6] stony asteroid, near-Earth object and the largest member of the Apollo group of asteroids, approximately 7 kilometers in diameter. It was discovered on 5 December 1972, by astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland.[3][18]

This S-type asteroid (composed of rocky silicates) orbits the Sun at a distance of 0.9–2.9 AU once every 2 years and 7 months (952 days). Its orbit has an eccentricity of 0.54 and an inclination of 41° with respect to the ecliptic.[1] Sisyphus has an Earth minimum orbit intersection distance of 0.1036 AU (15,500,000 km), which corresponds to 40.4 lunar distances.[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.[4][a] During the radar observations, a small satellite was detected around Sisyphus, although its existence was not reported until December 2007. Stephens confirmed that it is a suspected binary,[5] and Brian D. Warner added additional weight to this conclusion, giving 27.16±0.05 hours as the satellite's orbital period, longer than the 25 hours previously reported by Stephens.[6]

Sisyphus will pass 0.11581 AU (17,325,000 km) from Earth on 24 November 2071,[19] and will peak at roughly apparent magnitude 9.3 on November 26, 2071.[20] When it was discovered it peaked at magnitude 9.0 on 25 November 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 contributed to the extinction of the dinosaurs.[21] 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).

The minor planet is named after the Sisyphus from 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] Naming citation was published before November 1977 (M.P.C. 3758).[22]

References[edit]

  1. ^ a b c Benner (1985), gives a diameter of 8 kilometer. Summary figures listed at www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1866%7CSisyphus
  2. ^ a b Pravec (1998web), gives a rotation period of 2.4 hours. Summary figures listed at www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1866%7CSisyphus
  1. ^ a b c d e f g "JPL Small-Body Database Browser: 1866 Sisyphus (1972 XA)" (2016-08-15 last obs.). Jet Propulsion Laboratory. Retrieved 12 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1866) Sisyphus. Springer Berlin Heidelberg. p. 150. ISBN 978-3-540-00238-3. Retrieved 12 December 2016. 
  3. ^ a b "1866 Sisyphus (1972 XA)". Minor Planet Center. Retrieved 12 December 2016. 
  4. ^ a b c Ostro, S. J.; Campbell, D. B.; Chandler, J. F.; Shapiro, I. I.; Hine, A. A.; Velez, R.; et al. (October 1991). "Asteroid radar astrometry". Astronomical Journal: 1490–1502.ResearchsupportedbyNASA. Bibcode:1991AJ....102.1490O. doi:10.1086/115975. ISSN 0004-6256. Retrieved 12 December 2016. 
  5. ^ a b c Stephens, Robert D.; French, Linda, M.; Warner, Brian D.; Wasserman, Lawrence H. (October 2011). "The Curse of Sisyphus". The Minor Planet Bulletin. 38 (4): 212–213. Bibcode:2011MPBu...38..212S. ISSN 1052-8091. Retrieved 12 December 2016. 
  6. ^ a b c d Warner, Brian D. (October 2016). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 April-July". The Minor Planet Bulletin. 43 (4): 311–319. Bibcode:2016MPBu...43..311W. ISSN 1052-8091. Retrieved 12 December 2016. 
  7. ^ a b c Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 12 December 2016. 
  8. ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 12 December 2016. 
  9. ^ a b c Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 12 December 2016. 
  10. ^ a b "LCDB Data for (1866) Sisyphus". Asteroid Lightcurve Database (LCDB). Retrieved 12 December 2016. 
  11. ^ a b c Delbó, Marco; Harris, Alan W.; Binzel, Richard P.; Pravec, Petr; Davies, John K. (November 2003). "Keck observations of near-Earth asteroids in the thermal infrared". Icarus. 166 (1): 116–130. Bibcode:2003Icar..166..116D. doi:10.1016/j.icarus.2003.07.002. Retrieved 12 December 2016. 
  12. ^ a b Delbo, Marco; Walsh, Kevin; Mueller, Michael; Harris, Alan W.; Howell, Ellen S. (March 2011). "The cool surfaces of binary near-Earth asteroids". Icarus. 212 (1): 138–148. Bibcode:2011Icar..212..138D. doi:10.1016/j.icarus.2010.12.011. Retrieved 12 December 2016. 
  13. ^ Schober, H. J.; Erikson, A.; Hahn, G.; Lagerkvist, C. I.; Oja, T. (November 1993). "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. Bibcode:1993A&AS..101..499S. Retrieved 12 December 2016. 
  14. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1866) Sisyphus". Geneva Observatory. Retrieved 12 December 2016. 
  15. ^ Szabó, Gy. M.; Csák, B.; Sárneczky, K.; Kiss, L. L. (August 2001). "Photometric observations of 9 Near-Earth Objects". Astronomy and Astrophysics: 285–292. Bibcode:2001A&A...375..285S. doi:10.1051/0004-6361:20010813. Retrieved 12 December 2016. 
  16. ^ Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Wright, E.; Cutri, R. M.; et al. (August 2011). "Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE". The Astrophysical Journal. 736 (2): 9. Bibcode:2011ApJ...736..100M. doi:10.1088/0004-637X/736/2/100. Retrieved 12 December 2016. 
  17. ^ Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 12 December 2016. 
  18. ^ http://echo.jpl.nasa.gov/~lance/binary.neas.html
  19. ^ "JPL Close-Approach Data: 1866 Sisyphus (1972 XA)" (last observation: 2013-07-26). Retrieved 2013-10-30. 
  20. ^ "(1866) Sisyphus Ephemerides for November 2071". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 2013-10-30. 
  21. ^ "JPL Small-Body Database Search Engine: asteroids and NEOs and H < 13 (mag)". JPL Solar System Dynamics. Retrieved 2013-10-31. 
  22. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 December 2016. 

External links[edit]