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31 Euphrosyne (A854 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000031
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 106 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .218611783653634 1.7414e-08  
a 3.161791532105058 5.5009e-09 au
q 2.470586645730615 5.5653e-08 au
i 26.26222636012634 5.4459e-07 deg
node 30.9672592850564 3.2662e-06 deg
peri 61.62329841624505 5.2766e-06 deg
M 226.9916409109272 6.9037e-06 deg
tp 2460155.208080971505
(2023-Jul-29.70808097)
4.0928e-05 TDB
period 2053.516869318184
5.62
5.3591e-06
1.467e-08
d
yr
n .1753090054329714 4.5751e-10 deg/d
Q 3.8529964184795 6.7035e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2667  
   data-arc span      58692 days (160.69 yr)  
   first obs. used      1860-10-25  
   last obs. used      2021-07-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49452  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 09:16:06  

Additional Information
 Earth MOID = 1.58191 au 
 Jupiter MOID = 1.95931 au 
 T_jup = 3.010 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.87   n/a MPO614063 IRAS observations used: 19
diameter diameter 267.080 km 2.611 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.530 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Scaltriti, F.; Zappala, V.; Harris, A.W. (1980) Astron. Astrophys. 91, 1-6.]
[Barucci, M.A.; Fulchignoni, M.; Burchi, R.; D'Ambrosio, V. (1985) Icarus 61, 152-162.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[Kryszczynska, A.; Colas, F.; Berthier, J.; Michalowski, T.; Pych, W. (1996) Icarus 124, 134-140.]
[Torppa, J.; Hentunen, V.-P.; Paakkonen, P.; Kehusmaa, P.; Muinonen, K. (2008) Icarus 198, 91-107.]
[Pilcher, F.; Jardine, D. (2009) Minor Planet Bull. 36, 52-54.]
[Oey, J. (2010) Minor Planet Bull. 37, 135-136.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2012) Minor Planet Bull. 39, 57-60.]
[Pilcher, F. (2013) Minor Planet Bull. 40, 189.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Ferrais, M.; Jehin, E.; Manfroid, J.; Moulane, Y.; et al. (2019) Minor Planet Bull. 46, 278-279.]
geometric albedo albedo 0.053   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.687   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.43, mean=11.51, max.=13.73) deg.
U-B UB 0.317   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=7.43, mean=11.51, max.=13.73) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Cb   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)

31 Euphrosyne (A854 RA)          Discovered 1854-Sep-01 by Ferguson, J. at Washington
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A854 RA = A907 GP = A918 GB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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