+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   61 Danae (A860 RC) Classification: Main-belt Asteroid          SPK-ID: 2000061 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1650231348983689 4.8898e-08   a 2.984005916950234 9.223e-09 au q 2.491575905979824 1.4491e-07 au i 18.20999758815464 5.5892e-06 deg node 333.5718492597779 1.5965e-05 deg peri 12.47044352093064 2.2993e-05 deg M 348.6174388933621 1.9113e-05 deg tp 2459060.029938860198 (2020-Jul-29.52993886) 0.00010007 TDB period 1882.772935624619 5.15 8.7289e-06 2.39e-08 d yr n .1912073374267876 8.8647e-10 deg/d Q 3.476435927920643 1.0745e-08 au   Orbit Determination Parameters    # obs. used (total)      3157      data-arc span      56492 days (154.67 yr)      first obs. used      1865-08-27      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40191      source      ORB      producer      Otto Matic      solution date      2020-May-20 00:57:26   Additional Information  Earth MOID = 1.48612 au   Jupiter MOID = 1.93828 au   T_jup = 3.163  [ 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 7.5   n/a MPO492748 IRAS observations used: 18 diameter diameter 85.937 km 2.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 11.45 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Wood, H.J.; Kuiper, G.P. (1963) Astrophys. J. 137, 1279-1285.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.203   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.852   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.87, mean=6.84, max.=15.66) deg. U-B UB 0.402   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.87, mean=6.84, max.=15.66) 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) 61 Danae (A860 RC)          Discovered 1860-Sep-09 by Goldschmidt, H. at Paris Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A860 RC = 1953 RL1 = A917 SM  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 13:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin