+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   585 Bilkis (A906 DF) Classification: Main-belt Asteroid          SPK-ID: 2000585 [ 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 55 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1280194663644331 2.7063e-08   a 2.43152731810751 5.4309e-09 au q 2.120244488392845 6.5288e-08 au i 7.566859853134104 3.321e-06 deg node 180.2626020915125 2.3632e-05 deg peri 329.0868474844167 2.734e-05 deg M 116.5220175144148 1.3502e-05 deg tp 2458752.247571097573 (2019-Sep-25.74757110) 5.192e-05 TDB period 1384.895986588205 3.79 4.6398e-06 1.27e-08 d yr n .2599473198611016 8.709e-10 deg/d Q 2.742810147822174 6.1261e-09 au   Orbit Determination Parameters    # obs. used (total)      3517      data-arc span      41881 days (114.66 yr)      first obs. used      1906-02-16      last obs. used      2020-10-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42326      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:03:43   Additional Information  Earth MOID = 1.13436 au   Jupiter MOID = 2.25966 au   T_jup = 3.484  [ hide covariance matrix ] Orbital Elements at Epoch 2455954.5 (2012-Jan-28.0) TDB Reference: JPL 55 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1279498276905131 2.7078e-08   q 2.119591135605839 6.5411e-08 au tp 2455983.688334867958 (2012-Feb-26.18833487) 5.2808e-05 TDB node 180.3178182269291 2.3643e-05 deg peri 329.0256857293937 2.7341e-05 deg i 7.5651379801071 3.3208e-06 deg   Orbit Determination Parameters    # obs. used (total)      3517      data-arc span      41881 days (114.66 yr)      first obs. used      1906-02-16      last obs. used      2020-10-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42326      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:03:43   Additional Information  Jupiter MOID = 2.25966 au   T_jup = 3.484  Orbit Covariance (6×6)   e q tp node peri i e 7.332092987451698E-16 -1.76640052172564E-15 2.314303900264977E-13 -1.411089860091151E-16 5.464725862579996E-14 -5.382084215684987E-17 q -1.76640052172564E-15 4.278558717552038E-15 -6.115719500506365E-13 -3.124596113620794E-16 -1.457017201535637E-13 1.742017579324584E-16 tp 2.314303900264977E-13 -6.115719500506365E-13 2.788720385185721E-9 -1.597958845007558E-12 7.343103763944657E-10 -3.207522619528727E-13 node -1.411089860091151E-16 -3.124596113620794E-16 -1.597958845007558E-12 5.589873209055965E-10 -5.543009030032942E-10 1.309181212189306E-11 peri 5.464725862579996E-14 -1.457017201535637E-13 7.343103763944657E-10 -5.543009030032942E-10 7.475417480908029E-10 -1.308731537574503E-11 i -5.382084215684987E-17 1.742017579324584E-16 -3.207522619528727E-13 1.309181212189306E-11 -1.308731537574503E-11 1.102754149270932E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.53   n/a E2021B10 IRAS observations used: 15 diameter diameter 49.761 km 0.287 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 8.577 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2011) Minor Planet Bull. 38, 96-101.] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Brincat, S. (2012) Posting on CALL site. http://www.minorplanet.info/call.html] [Stephens, R.D. (2016) Minor Planet Bull. 43, 336-339.] [Wang, A.; Want, X.-B.; Muinonen, K.; Han, X.L.; Want, Y.-B. (2016) Research in Astron. Astrophys. 16, 180.] geometric albedo albedo 0.014   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   B-V BV 0.702   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.34 deg. U-B UB 0.320   0.052 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.34 deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 585 Bilkis (A906 DF)          Discovered 1906-Feb-16 by Kopff, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-03 03:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin