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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 723 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5380832682708995 1.9592e-08  
a 1.893699210044564 2.1152e-09 au
q .8747313499817644 3.7014e-08 au
i 41.19928004878117 4.7379e-07 deg
node 63.49079619033483 1.4727e-06 deg
peri 293.0630084560417 1.9792e-06 deg
M 104.1846728549483 4.3818e-06 deg
tp 2458725.035108259428
(2019-Aug-29.53510826)
1.1272e-05 TDB
period 951.8421309886187
2.61
1.5948e-06
4.366e-09
d
yr
n .378213979272057 6.3368e-10 deg/d
Q 2.912667070107363 3.2533e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4651  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      24088 days (65.95 yr)  
   first obs. used      1955-01-26  
   last obs. used      2021-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35788  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Jan-11 09:47:36  

Additional Information
 Earth MOID = .104589 au 
 Jupiter MOID = 3.25074 au 
 T_jup = 3.513 
[ hide covariance matrix ]
Orbital Elements at Epoch 2459334.5 (2021-Apr-30.0) TDB
Reference: JPL 723 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5382773312306517 1.9589e-08  
q .8742551082109975 3.7001e-08 au
tp 2459676.786455569449
(2022-Apr-07.28645557)
1.2391e-05 TDB
node 63.47607552536473 1.4731e-06 deg
peri 293.0726078560718 1.9782e-06 deg
i 41.20245457677699 4.7383e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      4651  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      24088 days (65.95 yr)  
   first obs. used      1955-01-26  
   last obs. used      2021-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35788  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Jan-11 09:47:36  

Additional Information
 Jupiter MOID = 3.25074 au 
 T_jup = 3.513 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.837177452311947E-16 -7.245427083217841E-16 4.859166266202688E-14 -7.882404905260744E-15 -1.23090001924576E-14 3.212101593158597E-15
q -7.245427083217841E-16 1.369038410607426E-15 -8.308711970731331E-14 1.508792129389025E-14 2.393675849835762E-14 -6.119016736004868E-15
tp 4.859166266202688E-14 -8.308711970731331E-14 1.535467989721268E-10 3.593128964758875E-12 1.584912851449959E-11 -1.108724492782711E-12
node -7.882404905260744E-15 1.508792129389025E-14 3.593128964758875E-12 2.169890911057985E-12 -5.950426970994599E-13 -7.725889564303465E-14
peri -1.23090001924576E-14 2.393675849835762E-14 1.584912851449959E-11 -5.950426970994599E-13 3.913341594735374E-12 -3.259329766406888E-13
i 3.212101593158597E-15 -6.119016736004868E-15 -1.108724492782711E-12 -7.725889564303465E-14 -3.259329766406888E-13 2.245112281228922E-13

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. 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

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