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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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1650231293124348 4.8794e-08  
a 2.984005927650858 8.5749e-09 au
q 2.491575931583058 1.4465e-07 au
i 18.20999391242619 5.5211e-06 deg
node 333.5718645816929 1.5278e-05 deg
peri 12.47045295943511 2.1221e-05 deg
M 348.6174067857099 1.6151e-05 deg
tp 2459060.030107101017
(2020-Jul-29.53010710)
8.4539e-05 TDB
period 1882.772945752035
5.15
8.1156e-06
2.222e-08
d
yr
n .1912073363982854 8.2419e-10 deg/d
Q 3.476435923718657 9.99e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3285  
   data-arc span      56674 days (155.16 yr)  
   first obs. used      1865-08-27  
   last obs. used      2020-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41885  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:50  

Additional Information
 Earth MOID = 1.48612 au 
 Jupiter MOID = 1.93828 au 
 T_jup = 3.163 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455385.5 (2010-Jul-08.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1689106064616729 4.8548e-08  
q 2.479276965178429 1.4494e-07 au
tp 2455302.118094086171
(2010-Apr-15.61809409)
8.0898e-05 TDB
node 333.7634854081568 1.5274e-05 deg
peri 13.25330281102635 2.1e-05 deg
i 18.22179109183608 5.5235e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3285  
   data-arc span      56674 days (155.16 yr)  
   first obs. used      1865-08-27  
   last obs. used      2020-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41885  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:50  

Additional Information
 Jupiter MOID = 1.93828 au 
 T_jup = 3.163 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.356867785736806E-15 -7.028614926964713E-15 2.206421365779281E-13 -8.48142665370353E-17 -6.604744273830783E-15 -1.070547816906184E-15
q -7.028614926964713E-15 2.100845442386727E-14 -6.408292382714376E-13 -1.248844462183411E-15 2.244907923367601E-14 3.534288484331089E-15
tp 2.206421365779281E-13 -6.408292382714376E-13 6.544441940988012E-9 -8.246167156356745E-13 1.189883991469934E-9 -4.103987444547117E-12
node -8.48142665370353E-17 -1.248844462183411E-15 -8.246167156356745E-13 2.333034383792478E-10 -2.21479089713118E-10 -1.359685499156819E-12
peri -6.604744273830783E-15 2.244907923367601E-14 1.189883991469934E-9 -2.21479089713118E-10 4.409812849481704E-10 5.917580922027705E-13
i -1.070547816906184E-15 3.534288484331089E-15 -4.103987444547117E-12 -1.359685499156819E-12 5.917580922027705E-13 3.050879864176574E-11

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.DBLast 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 ]
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