+ 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 713 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5380833051444845 3.2666e-08   a 1.89369920997092 2.2333e-09 au q .8747312801202679 6.1898e-08 au i 41.19929068591867 4.3776e-06 deg node 63.49079970603209 6.1648e-06 deg peri 293.0630044414303 6.3141e-06 deg M 104.1846730367514 5.5537e-06 deg tp 2458725.035107794808 (2019-Aug-29.53510779) 1.4362e-05 TDB period 951.8421309330942 2.61 1.6838e-06 4.61e-09 d yr n .3782139792941197 6.6905e-10 deg/d Q 2.912667139821572 3.4349e-09 au   Orbit Determination Parameters    # obs. used (total)      4570      # delay obs. used      0      # Doppler obs. used      1      data-arc span      23911 days (65.46 yr)      first obs. used      1955-01-26      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35626      source      ORB      producer      Otto Matic      solution date      2020-Jul-14 06:41:19   Additional Information  Earth MOID = .104589 au   Jupiter MOID = 3.25074 au   T_jup = 3.513  [ hide covariance matrix ] Orbital Elements at Epoch 2456435.5 (2013-May-23.0) TDB Reference: JPL 713 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5384143406277804 3.2653e-08   q .8740549067440067 6.1876e-08 au tp 2456821.519592470538 (2014-Jun-13.01959247) 1.2471e-05 TDB node 63.559115375375 6.1695e-06 deg peri 293.059597556056 6.3162e-06 deg i 41.19315017347643 4.3785e-06 deg   Orbit Determination Parameters    # obs. used (total)      4570      # delay obs. used      0      # Doppler obs. used      1      data-arc span      23911 days (65.46 yr)      first obs. used      1955-01-26      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35626      source      ORB      producer      Otto Matic      solution date      2020-Jul-14 06:41:19   Additional Information  Jupiter MOID = 3.25074 au   T_jup = 3.513  Orbit Covariance (6×6)   e q tp node peri i e 1.066224852855755E-15 -2.02017679219433E-15 8.866873484836808E-14 1.7399974212442E-14 9.607113585907986E-15 8.658639100917336E-16 q -2.02017679219433E-15 3.828640919720353E-15 -1.622452500118933E-13 -3.307138805301874E-14 -1.717158786430462E-14 -1.726525241690877E-15 tp 8.866873484836808E-14 -1.622452500118933E-13 1.555169388458835E-10 -3.468526226252253E-12 4.262679743591056E-11 -2.249040618312105E-12 node 1.7399974212442E-14 -3.307138805301874E-14 -3.468526226252253E-12 3.806228274281399E-11 -2.810908050338783E-11 -7.694678455135825E-12 peri 9.607113585907986E-15 -1.717158786430462E-14 4.262679743591056E-11 -2.810908050338783E-11 3.989404595049405E-11 4.864392726221825E-12 i 8.658639100917336E-16 -1.726525241690877E-15 -2.249040618312105E-12 -7.694678455135825E-12 4.864392726221825E-12 1.917108442888406E-11 [ 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-August); 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.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-08 17:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin