+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1685114745358962 3.583e-08   a 2.233300191558241 5.679e-09 au q 1.856963483197462 7.8737e-08 au i 5.705568623413428 3.4834e-06 deg node 119.8116945018842 3.6179e-05 deg peri 237.783521923498 3.7864e-05 deg M 103.5588812805365 1.1545e-05 deg tp 2458649.825706183245 (2019-Jun-15.32570618) 3.8815e-05 TDB period 1219.04315895462 3.34 4.6498e-06 1.273e-08 d yr n .2953135804549487 1.1264e-09 deg/d Q 2.60963689991902 6.6359e-09 au   Orbit Determination Parameters    # obs. used (total)      2824      data-arc span      23889 days (65.40 yr)      first obs. used      1955-06-22      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41485      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:08:33   Additional Information  Earth MOID = .859787 au   Jupiter MOID = 2.83546 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 12.7   n/a MPO395021   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-Jan-19 00:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin