+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   420 Bertholda (A896 RC) Classification: Outer Main-belt Asteroid          SPK-ID: 2000420 [ 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 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02960704518401135 3.5024e-08   a 3.413318794743975 1.6089e-08 au q 3.312260510960555 1.1684e-07 au i 6.689400873109722 4.2426e-06 deg node 242.6418830534602 3.5184e-05 deg peri 235.4154946457672 8.7106e-05 deg M 79.19033948925167 7.8047e-05 deg tp 2458493.820411635452 (2019-Jan-10.32041164) 0.00050034 TDB period 2303.369994214946 6.31 1.6286e-05 4.459e-08 d yr n .1562927366876194 1.1051e-09 deg/d Q 3.514377078527395 1.6566e-08 au   Orbit Determination Parameters    # obs. used (total)      3458      data-arc span      43881 days (120.14 yr)      first obs. used      1900-04-26      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36674      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:13:32   Additional Information  Earth MOID = 2.33479 au   Jupiter MOID = 1.5862 au   T_jup = 3.133  [ 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 8.4   n/a MPO384747   diameter diameter 138.699 km 3.446 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.04 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Zappala, V.; Di Martino, M.; Cellino, A.; Farinella, P.; et al. (1989) Icarus 82, 354-368.] [Lagerkvist, C.-I.; Erikson, A.; Lahulla, F.; Di Martino, M.; et al. (2001) Icarus 149, 190-197.] [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.044   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.691   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.23, mean=5.51, max.=6.93) deg. U-B UB 0.229   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.23, mean=5.51, max.=6.93) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 420 Bertholda (A896 RC)          Discovered 1896-Sep-07 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-11 08:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin