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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 653 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5380833060863646 3.3352e-08  
a 1.893699210373486 2.2059e-09 au
q .8747312785225825 6.3287e-08 au
i 41.19929059343009 4.691e-06 deg
node 63.49080074005688 6.2872e-06 deg
peri 293.063004858783 6.3796e-06 deg
M 104.184671305207 5.2379e-06 deg
tp 2458725.035112285183
(2019-Aug-29.53511229)		 1.3543e-05 TDB
period 951.8421312366107
2.61		 1.6631e-06
4.553e-09		 d
yr
n .3782139791735175 6.6085e-10 deg/d
Q 2.912667142224389 3.3929e-09 au
   Orbit Determination Parameters
   # obs. used (total)      4230  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      23741 days (65.00 yr)  
   first obs. used      1955-01-26  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36158  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 05:45:08  

Additional Information
 Earth MOID = .104589 au 
 Jupiter MOID = 3.25074 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: 2003-08-29

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