+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1647772301259816 1.2756e-08   a 2.983173561805355 7.6087e-09 au q 2.49161448530601 3.7187e-08 au i 18.2114097681126 5.0341e-07 deg node 333.5728614707612 1.7361e-06 deg peri 12.50245666152748 9.3108e-06 deg M 26.84748378642512 6.5397e-06 deg tp 2459060.148422900292 (2020-Jul-29.64842290) 3.4156e-05 TDB period 1881.985222817885 5.15 7.2001e-06 1.971e-08 d yr n .1912873680596568 7.3183e-10 deg/d Q 3.4747326383047 8.8624e-09 au   Orbit Determination Parameters    # obs. used (total)      3510      data-arc span      56804 days (155.52 yr)      first obs. used      1865-08-27      last obs. used      2021-03-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4165      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:47:44   Additional Information  Earth MOID = 1.48435 au   Jupiter MOID = 1.94053 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 7.66   n/a MPCxxxxx 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. 2020-October); 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] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] 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 ] 2021-Jun-17 00:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin