+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   31485 (1999 CM51) Classification: Main-belt Asteroid          SPK-ID: 2031485 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2037209470821648 3.5157e-08   a 2.654888979595169 1.3612e-08 au q 2.114032482274039 9.1308e-08 au i 14.6402143583651 5.2764e-06 deg node 346.9261917879992 1.5965e-05 deg peri 48.55450964282374 2.084e-05 deg M 69.95588810652971 1.2764e-05 deg tp 2458693.463683177534 (2019-Jul-28.96368318) 5.5817e-05 TDB period 1580.03960849967 4.33 1.2152e-05 3.327e-08 d yr n .2278423895599926 1.7523e-09 deg/d Q 3.195745476916299 1.6386e-08 au   Orbit Determination Parameters    # obs. used (total)      1695      data-arc span      14553 days (39.84 yr)      first obs. used      1980-12-31      last obs. used      2020-11-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4664      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:34:10   Additional Information  Earth MOID = 1.14671 au   Jupiter MOID = 2.39005 au   T_jup = 3.313  [ 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 13.2   n/a MPO502392   diameter diameter 9.786 km 0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.001 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pligge, Z.; Hall, B.; Ditteon, R. (2011) Minor Planet Bull. 38, 137-138.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.140   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   31485 (1999 CM51)          Discovered 1999-Feb-10 by LINEAR at Socorro Reference: 20011130/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 CM51 = 1980 YJ = 1984 UA4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 12:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin