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JPL Small-Body Database Browser
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31 Euphrosyne
Classification: Main-belt Asteroid          SPK-ID: 2000031
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2199420913813189 3.0313e-08  
a 3.158100280582939 5.9062e-09 au
q 2.463501100079598 9.5546e-08 au
i 26.28000564386172 4.189e-06 deg
node 31.09092837016466 7.6403e-06 deg
peri 61.62383277024581 1.2542e-05 deg
M 157.3707671722015 9.7571e-06 deg
tp 2458104.395078656650
5.3919e-05 TDB
period 2049.921834152378
n .1756164522970001 4.9265e-10 deg/d
Q 3.852699461086281 7.2052e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2388  
   data-arc span      58156 days (159.22 yr)  
   first obs. used      1860-10-25  
   last obs. used      2020-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:15:17  

Additional Information
 Earth MOID = 1.57532 au 
 Jupiter MOID = 1.9589 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 6.8   n/a MPO492748 IRAS observations used: 19
diameter diameter 267.080 km 2.611 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.530 h n/a LCDB (Rev. 2019-August); 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,]
[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] (  
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          Discovered 1854-Sep-01 by Ferguson, J. at Washington
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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