+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 13:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin