+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   639 Latona (A907 OA) Classification: Main-belt Asteroid          SPK-ID: 2000639 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1072594755937508 1.5143e-08   a 3.016593937494014 1.2052e-08 au q 2.693035653679118 4.9862e-08 au i 8.555410950440194 9.3945e-07 deg node 279.8320665476494 8.9841e-06 deg peri 70.68723577677351 1.5995e-05 deg M 194.761964740521 1.6035e-05 deg tp 2460078.877554111953 (2023-May-14.37755411) 8.7443e-05 TDB period 1913.699342791979 5.24 1.1469e-05 3.14e-08 d yr n .1881173243623422 1.1274e-09 deg/d Q 3.34015222130891 1.3345e-08 au   Orbit Determination Parameters    # obs. used (total)      3210      data-arc span      41520 days (113.68 yr)      first obs. used      1907-07-20      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41354      source      ORB      producer      Otto Matic      solution date      2021-May-03 18:41:51   Additional Information  Earth MOID = 1.7 au   Jupiter MOID = 2.07844 au   T_jup = 3.222  [ 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 8.32   n/a MPCxxxxx IRAS observations used: 15 diameter diameter 78.509 km 1.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.193 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P. (1987) Icarus 72, 135-208.] [Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.] [Warner, B.D. (2008) Minor Planet Bull. 35, 56-60.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.123   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.836   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.31, mean=9.42, max.=16.89) deg. U-B UB 0.477   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=5.44, mean=10.44, max.=16.89) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 639 Latona (A907 OA)          Discovered 1907-Jul-19 by Lohnert, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A907 OA = A913 UB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-23 12:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin