+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   110 Lydia (A870 HA) Classification: Main-belt Asteroid          SPK-ID: 2000110 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 94 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08111494370355615 2.3367e-08   a 2.734107142115517 6.2178e-09 au q 2.512330195203326 6.5665e-08 au i 5.95920266322285 4.145e-07 deg node 56.81839663918135 2.9963e-06 deg peri 282.1847173106542 9.7319e-06 deg M 338.7955245112335 8.203e-06 deg tp 2459297.762796988758 (2021-Mar-24.26279699) 3.7644e-05 TDB period 1651.283802539815 4.52 5.6329e-06 1.542e-08 d yr n .2180121911486623 7.4369e-10 deg/d Q 2.955884089027708 6.7221e-09 au   Orbit Determination Parameters    # obs. used (total)      2604      data-arc span      9519 days (26.06 yr)      first obs. used      1994-11-04      last obs. used      2020-11-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .37867      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:18:29   Additional Information  Earth MOID = 1.51027 au   Jupiter MOID = 2.34177 au   T_jup = 3.340  [ 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 7.85   n/a E2021B10 IRAS observations used: 15 magnitude slope G 0.20   n/a PDS3 (MPC 17257) Fit diameter diameter 86.09 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15 rotation period rot_per 10.927 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Taylor, R.C.; Gehrels, T.; Silvester, A.B. (1971) Astron. J. 76, 141-146.] [Pray, D. (2004) Minor Planet Bull. 31, 34-36.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Marciniak, A.; et al. (2007) Astron. Astrophys. 465, 331-337.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D.; Stephens, R.D.; Harris, A.W.; Shepard, M.K. (2009) Minor Planet Bull. 36, 38-39.] [Stephens, Robert D.; Warner, Brian D. (2013) Minor Planet Bull. 40, 93-94.] [Warner, B.D. (2014) Minor Planet Bull. 41, 144-155.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.1808   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15 B-V BV 0.705   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=25; phase (min.=.52, mean=7.62, max.=19.59) deg. U-B UB 0.298   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=14; phase (min.=.52, mean=7.70, max.=19.59) deg. Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B X   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) 110 Lydia (A870 HA)          Discovered 1870-Apr-19 by Borrelly, A. at Marseille Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2005-Aug-09 22:19 < 00:01 Europ 0.0483674246126698 0.0483665295746941 0.0483683196517681 3.11039037219088 3.11039030154223 2453592.429856825 0.62196412923715 46.8862484280406 26.8403886722312 -22.1934826640151 175268.105285808 T 94 CATAB v2.0f-lin.ifort 2021-Apr-12 10:19:55 2021-Apr-12 10:19 Alternate Designations  A870 HA = 1972 YS1 = A899 VA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 00:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin