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1866 Sisyphus (1972 XA)
Classification: Apollo [NEO]          SPK-ID: 2001866
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 777 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5383058285683006 1.6595e-08  
a 1.893432024211744 1.9742e-09 au
q .8741865295806867 3.1437e-08 au
i 41.20353331847716 7.9148e-07 deg
node 63.47452781169024 2.1507e-06 deg
peri 293.0749285291916 2.43e-06 deg
M 253.9728098989729 4.2358e-06 deg
tp 2459676.777190473267
(2022-Apr-07.27719047)
1.1493e-05 TDB
period 951.640692111471
2.61
1.4884e-06
4.075e-09
d
yr
n .3782940378487211 5.9166e-10 deg/d
Q 2.912677518842802 3.037e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5120  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      24296 days (66.52 yr)  
   first obs. used      1955-01-26  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-04 06:07:34  

Additional Information
 Earth MOID = .103702 au 
 Jupiter MOID = 3.25295 au 
 T_jup = 3.513 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.44   n/a E2021B10  
diameter diameter 8.48 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
rotation period rot_per 2.400 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Erikson, A.; Hahn, G.; Lagerkvist, C.-I. (1993) Astron. Astrophys. Suppl. Ser. 101, 499-505.]
[Pravec, P.; Wolf, M.; Sarounova, L. (1998) http://www.asu.cas.cz/~ppravec/neo.htm]
[Stephens, R.D.; French, L.M.; Warner, B.D.; Wasserman, L. (2011) Minor Planet Bull. 38, 212-213.]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2016) Minor Planet Bull. 43, 306-309.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 311-319.]
[Aznar, A.M.; Predatu, M.; Vaduvescu, O.; Oey, J. (2018) arXiv:1801.09420. Romanian J. Phys. 62, 904 (2017).]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.15   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1866 Sisyphus (1972 XA)          Discovered 1972-Dec-05 by Wild, P. at Zimmerwald
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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