+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   660 Crescentia (A908 AN) Classification: Main-belt Asteroid          SPK-ID: 2000660 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 84 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1077969091799012 4.2179e-08   a 2.533687173399096 7.0271e-09 au q 2.260563527277913 1.0697e-07 au i 15.19899246433465 3.4684e-06 deg node 156.9329957311083 1.7151e-05 deg peri 105.7766602722433 2.2759e-05 deg M 168.0026537020848 1.5848e-05 deg tp 2458313.049302263470 (2018-Jul-13.54930226) 6.4224e-05 TDB period 1473.085369377589 4.03 6.1283e-06 1.678e-08 d yr n .244385021726275 1.0167e-09 deg/d Q 2.806810819520279 7.7846e-09 au   Orbit Determination Parameters    # obs. used (total)      3229      data-arc span      40695 days (111.42 yr)      first obs. used      1909-06-16      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40558      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:55:10   Additional Information  Earth MOID = 1.29809 au   Jupiter MOID = 2.38605 au   T_jup = 3.393  [ 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 MPO502159 IRAS observations used: 9 diameter diameter 42.302 km 0.352 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.9116 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2009) Minor Planet Bull. 36, 109-116.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.] [Stephens, R.D. (2014) Minor Planet Bull. 41, 226-230.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Cikignese, A. (2019) Minor Planet Bull. 46, 10.] geometric albedo albedo 0.332   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.860   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=11.13, mean=16.71, max.=19.70) deg. U-B UB 0.475   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=11.13, mean=16.71, max.=19.70) 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 660 Crescentia (A908 AN)          Discovered 1908-Jan-08 by Metcalf, J. H. at Taunton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A908 AN = 1961 CF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 18:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin