+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1866 Sisyphus (1972 XA) Classification: Apollo [NEO]          SPK-ID: 2001866 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 305 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5384437289452937 3.8129e-08   a 1.893552140216235 1.6829e-09 AU q .8739808648858637 7.2398e-08 AU i 41.19336252236042 6.0552e-06 deg node 63.55865341016997 6.8473e-06 deg peri 293.0610867568353 7.0453e-06 deg M 200.7492881804638 5.5778e-06 deg tp 2456821.510774698087 (2014-Jun-13.01077470) 1.5015e-05 JED period 951.7312491705807 2.61 1.2687e-06 3.474e-09 d yr n .3782580432382929 5.0425e-10 deg/d Q 2.913123415546606 2.589e-09 AU   Orbit Determination Parameters    # obs. used (total)      2264      # delay obs. used      0      # Doppler obs. used      1      data-arc span      21291 days (58.29 yr)      first obs. used      1955-01-26      last obs. used      2013-05-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .49824      data source      ORB      producer      Otto Matic      solution date      2013-May-15 01:15:13   Additional Information  Earth MOID = .103271 AU   T_jup = 3.513  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.0 mag n/a PDS3 (MPC 17263)   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 Asteroid Lightcurve DataBase (Rev. 2013-May-01) 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 Bul. 38, 212-213.] 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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 05:08 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin