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JPL Small-Body Database Browser
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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 609 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5380638777389238 4.0464e-08  
a 1.893971556570787 2.5035e-09 au
q .8748938765150839 7.6938e-08 au
i 41.20139085128154 5.1776e-06 deg
node 63.49506350291923 7.1335e-06 deg
peri 293.0598919040687 6.9204e-06 deg
M 312.9148636816906 5.829e-06 deg
tp 2458725.020236542169
(2019-Aug-29.52023654)
1.5585e-05 TDB
period 952.0474752825447
2.61
1.8877e-06
5.168e-09
d
yr
n .3781324034215423 7.4975e-10 deg/d
Q 2.91304923662649 3.8506e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3905  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      23638 days (64.72 yr)  
   first obs. used      1955-01-26  
   last obs. used      2019-10-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36349  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Oct-16 05:49:14  

Additional Information
 Earth MOID = .104496 au 
 Jupiter MOID = 3.2481 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 12.4   n/a MPO267714  
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. 2019-January); 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, Brian 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 Macias, A.; Predatu, M.; Vaduvescu, O.; Oey, J. (2018) arXiv:1801.09420. Romanian J. Phys. 62, 904 (2017).]
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: 2013-09-05

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