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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1647817104465486 1.2752e-08  
a 2.983557852980609 7.5522e-09 au
q 2.491922086750232 3.7188e-08 au
i 18.21131229956828 5.034e-07 deg
node 333.5717511918929 1.7357e-06 deg
peri 12.55771195119857 9.3093e-06 deg
M 64.29110118059667 6.5493e-06 deg
tp 2459060.338103047597
(2020-Jul-29.83810305)
3.4154e-05 TDB
period 1882.348889357474
5.15
7.1471e-06
1.957e-08
d
yr
n .1912504116720272 7.2616e-10 deg/d
Q 3.475193619210985 8.7967e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3522  
   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      .42363  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:28:43  

Additional Information
 Earth MOID = 1.48571 au 
 Jupiter MOID = 1.94025 au 
 T_jup = 3.163 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457232.5 (2015-Jul-29.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1673185338257286 1.2689e-08  
q 2.484002833524911 3.714e-08 au
tp 2457180.469148400795
(2015-Jun-06.96914840)
3.3829e-05 TDB
node 333.7273868638929 1.73e-06 deg
peri 12.84207047598457 9.1592e-06 deg
i 18.21209620384683 5.0327e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3522  
   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      .42363  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:28:43  

Additional Information
 Jupiter MOID = 1.94025 au 
 T_jup = 3.163 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.610032511372909E-16 -4.645910433042559E-16 1.909189350282698E-14 -1.127570337743273E-14 5.961538743014001E-15 -2.854513203782983E-15
q -4.645910433042559E-16 1.379387203970446E-15 -9.724619119478311E-14 3.379297969348972E-14 -2.862116298565048E-14 8.63775540322699E-15
tp 1.909189350282698E-14 -9.724619119478311E-14 1.144406278223027E-9 -2.541937391743689E-11 3.079463197319328E-10 -3.866137622759668E-12
node -1.127570337743273E-14 3.379297969348972E-14 -2.541937391743689E-11 2.993050558693104E-12 -7.925563199167656E-12 3.681305592021752E-13
peri 5.961538743014001E-15 -2.862116298565048E-14 3.079463197319328E-10 -7.925563199167656E-12 8.389019788474494E-11 -1.247612949965969E-12
i -2.854513203782983E-15 8.63775540322699E-15 -3.866137622759668E-12 3.681305592021752E-13 -1.247612949965969E-12 2.532821931460655E-13

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.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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