+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   72 Feronia (A861 KA) Classification: Main-belt Asteroid          SPK-ID: 2000072 [ 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 123 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1204680763082985 3.2397e-08   a 2.266641932353973 3.7336e-09 au q 1.993583939083565 7.3048e-08 au i 5.415254606013626 3.5161e-06 deg node 207.9514887125738 3.5954e-05 deg peri 102.9693054758674 3.9065e-05 deg M 180.0086879142404 1.6865e-05 deg tp 2459823.691967910843 (2022-Sep-01.19196791) 5.9027e-05 TDB period 1246.444096929572 3.41 3.0797e-06 8.432e-09 d yr n .2888216173407263 7.1362e-10 deg/d Q 2.53969992562438 4.1834e-09 au   Orbit Determination Parameters    # obs. used (total)      3304      data-arc span      56828 days (155.59 yr)      first obs. used      1865-06-23      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47154      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:43:09   Additional Information  Earth MOID = .986038 au   Jupiter MOID = 2.6858 au   T_jup = 3.600  [ 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 9.1   n/a MPO502153 IRAS observations used: 21 diameter diameter 74.966 km 1.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 8.097 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2005) 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] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] geometric albedo albedo 0.083   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.785   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.28, mean=7.77, max.=15.33) deg. U-B UB 0.375   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.28, mean=7.77, max.=15.33) deg. Tholen spectral type spec_T TDG   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 72 Feronia (A861 KA)          Discovered 1861-May-29 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A861 KA = 1927 TK = 1950 LJ = A902 GA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 14:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin