+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .107021235036741 3.8925e-08   a 3.017226545664992 1.2688e-08 au q 2.694319234362285 1.1726e-07 au i 8.555647299170266 4.449e-06 deg node 279.8359978748582 2.7333e-05 deg peri 70.6570335648197 3.3726e-05 deg M 157.1790000760264 2.0768e-05 deg tp 2458164.700075261919 (2018-Feb-15.20007526) 0.0001097 TDB period 1914.301355525686 5.24 1.2075e-05 3.306e-08 d yr n .1880581649074476 1.1862e-09 deg/d Q 3.3401338569677 1.4046e-08 au   Orbit Determination Parameters    # obs. used (total)      2932      data-arc span      41239 days (112.91 yr)      first obs. used      1907-07-20      last obs. used      2020-06-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42914      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:17:50   Additional Information  Earth MOID = 1.70302 au   Jupiter MOID = 2.0782 au   T_jup = 3.222  [ 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 8.3   n/a MPO502159 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. 2019-August); 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 [ show close-approach data ] Alternate Designations  A907 OA = A913 UB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-06 10:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin