+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 111 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02949607820498448 3.4761e-08   a 3.412838392496918 1.5897e-08 au q 3.312173044370855 1.1559e-07 au i 6.68975287117539 4.2276e-06 deg node 242.6399293991448 3.49e-05 deg peri 235.1242056829923 8.7221e-05 deg M 110.7599648118877 7.827e-05 deg tp 2458491.979662631940 (2019-Jan-08.47966263) 0.00050202 TDB period 2302.883734982242 6.30 1.609e-05 4.405e-08 d yr n .1563257382608488 1.0922e-09 deg/d Q 3.51350374062298 1.6365e-08 au   Orbit Determination Parameters    # obs. used (total)      3552      data-arc span      44094 days (120.72 yr)      first obs. used      1900-04-26      last obs. used      2021-01-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36374      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:03:34   Additional Information  Earth MOID = 2.33457 au   Jupiter MOID = 1.58616 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 8.36   n/a E2021B10   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. 2020-October); 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] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] 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 ] 2021-Mar-01 18:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin