+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   55 Pandora (A858 RB) Classification: Main-belt Asteroid          SPK-ID: 2000055 [ 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 76 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1432464225631243 3.0068e-08   a 2.760437589333505 5.7041e-09 au q 2.365014779952706 8.3606e-08 au i 7.179404525196877 3.5475e-06 deg node 10.36964301192449 2.8871e-05 deg peri 5.385957778945762 3.1724e-05 deg M 86.99154546031066 1.394e-05 deg tp 2458595.700589402445 (2019-Apr-22.20058940) 6.4532e-05 TDB period 1675.194836969612 4.59 5.1924e-06 1.422e-08 d yr n .2149003757982155 6.661e-10 deg/d Q 3.155860398714304 6.5212e-09 au   Orbit Determination Parameters    # obs. used (total)      2733      data-arc span      39105 days (107.06 yr)      first obs. used      1913-10-24      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .3425      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:42   Additional Information  Earth MOID = 1.36622 au   Jupiter MOID = 2.31081 au   T_jup = 3.315  [ 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 7.7   n/a MPO234839   diameter diameter 84.794 km 2.501 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 4.8040 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Schober, H.J. (1978) Astron. Astrophys. Suppl. Ser. 34, 377-381.] [Barucci, M.A.; Fulchignoni, M.; Burchi, R.; D'Ambrosio, V. (1985) Icarus 61, 152-162.] [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.] [Michalowski, T. (1993) Icarus 106, 563-572.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; et al. (1995) Astron. Astrophys. Suppl. Ser. 113, 115-129.] [Michalowski, T. (1996) Icarus 123, 456-462.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] geometric albedo albedo 0.204   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.704   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.83, mean=10.78, max.=19.01) deg. U-B UB 0.242   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=3.79, mean=6.51, max.=11.04) deg. Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 55 Pandora (A858 RB)          Discovered 1858-Sep-10 by Searle, G. at Albany Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 21:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin