+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   287 Nephthys (A889 QA) Classification: Main-belt Asteroid          SPK-ID: 2000287 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 122 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02290063763289003 1.8819e-08   a 2.353256549951674 2.486e-09 au q 2.299365474444006 4.3638e-08 au i 10.03522514809993 6.7565e-07 deg node 142.3203708018796 1.8973e-06 deg peri 119.2765682740172 4.3016e-05 deg M 204.4558111755213 4.2157e-05 deg tp 2459770.209722051586 (2022-Jul-09.70972205) 0.00015433 TDB period 1318.567421184777 3.61 2.0894e-06 5.72e-09 d yr n .2730235816660236 4.3264e-10 deg/d Q 2.407147625459342 2.543e-09 au   Orbit Determination Parameters    # obs. used (total)      3641      data-arc span      45521 days (124.63 yr)      first obs. used      1896-07-26      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46247      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:38:22   Additional Information  Earth MOID = 1.29524 au   Jupiter MOID = 2.61032 au   T_jup = 3.535  [ 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 8.24   n/a E2021B10 IRAS observations used: 12 magnitude slope G 0.22   n/a PDS3 (MPC 17258) Fit diameter diameter 59.615 km 1.284 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.605 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.] [Blanco, C.; Di Martino, M.; De Sanctis, G.; Riccioli, D. (1996) Planet. Space Sci. 44, 93-106.] [Behrend, R. (2000) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Fauerbach, M.; Bennett, T. (2005) Minor Planet Bull. 32, 34-35.] [Alton, K. (2008) Minor Planet Bull. 35, 33-34.] [Fauerbach, M.; Marks, S.A.; Lucas, M.P. (2008) Minor Planet Bull. 35, 44-46.] [Alton, K.B. (2011) Minor Planet Bull. 38, 8-9.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Collaborative Asteroid Lightcurve Link (CALL) (2011) http://www.minorplanetobserver.com/DATA/submissions_results.htm] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.238   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.873   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.92, mean=14.93, max.=21.12) deg. U-B UB 0.490   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.92, mean=14.93, max.=21.12) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices 287 Nephthys (A889 QA)          Discovered 1889-Aug-25 by Peters, C. H. F. at Clinton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 16:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin