+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2815 Soma (1982 RL) Classification: Main-belt Asteroid          SPK-ID: 2002815 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1688146628642419 1.4447e-08   a 2.232819999387025 5.078e-09 au q 1.855887243953968 3.23e-08 au i 5.705607722304601 2.1377e-07 deg node 119.8110238727143 3.7705e-06 deg peri 237.80761254 6.4367e-06 deg M 220.4789727428324 4.2992e-06 deg tp 2459868.798059818941 (2022-Oct-16.29805982) 1.5359e-05 TDB period 1218.650011954267 3.34 4.1573e-06 1.138e-08 d yr n .2954088511620266 1.0078e-09 deg/d Q 2.609752754820083 5.9353e-09 au   Orbit Determination Parameters    # obs. used (total)      3393      data-arc span      24110 days (66.01 yr)      first obs. used      1955-06-22      last obs. used      2021-06-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39409      source      ORB      producer      Otto Matic      solution date      2021-Jul-07 21:59:14   Additional Information  Earth MOID = .857907 au   Jupiter MOID = 2.8362 au   T_jup = 3.615  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.78   n/a MPCxxxxx   diameter diameter 6.641 km 0.105 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 2.73325 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2009) http://www.asu.cas.cz/~ppravec/neo.htm] [Pollock, J.; Pravec, P.; Kusnirak, P.; Hornoch, K.; et al. (2011) CBET 2705.] geometric albedo albedo 0.365   0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2815 Soma (1982 RL)          Discovered 1982-Sep-15 by Bowell, E. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1982 RL = 1955 MH = 1970 AC = 1974 DL = 1979 XB1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-25 09:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin