+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   28 Bellona (A854 EA) Classification: Main-belt Asteroid          SPK-ID: 2000028 [ 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 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1516839660892657 3.0066e-08   a 2.775723890030034 5.0799e-09 au q 2.354691081621553 8.4035e-08 au i 9.430440182639707 3.5553e-06 deg node 144.2870823955433 1.5906e-05 deg peri 343.9596230847162 1.841e-05 deg M 41.42652524339962 1.0311e-05 deg tp 2459006.125706286714 (2020-Jun-05.62570629) 4.8168e-05 TDB period 1689.129013974735 4.62 4.6369e-06 1.27e-08 d yr n .2131275923991586 5.8507e-10 deg/d Q 3.196756698438514 5.8504e-09 au   Orbit Determination Parameters    # obs. used (total)      2947      data-arc span      60009 days (164.30 yr)      first obs. used      1856-09-29      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53853      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:42:49   Additional Information  Earth MOID = 1.37089 au   Jupiter MOID = 1.85702 au   T_jup = 3.299  [ 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 7.24   n/a E2021B10 IRAS observations used: 18 diameter diameter 120.90 km 3.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 rotation period rot_per 15.706 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2007) Minor Planet Bull. 34, 104-107.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Pilcher, F. (2011) Minor Planet Bull. 38, 156-158.] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] geometric albedo albedo 0.1763   0.010 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 B-V BV 0.845   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=1.74, mean=10.22, max.=22.69) deg. U-B UB 0.469   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=14.00, mean=17.13, max.=22.69) 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 SMASSII spectral type spec_B S   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) 28 Bellona (A854 EA)          Discovered 1854-Mar-01 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A854 EA = 1951 CC2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin