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31 Euphrosyne
Classification: Main-belt Asteroid          SPK-ID: 2000031
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 81 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2215109805141109 2.6947e-08  
a 3.156312568047474 7.4538e-09 au
q 2.457154676290267 8.5375e-08 au
i 26.30429622974443 4.2343e-06 deg
node 31.1204652532776 7.0434e-06 deg
peri 61.44267315575501 1.2099e-05 deg
M 271.3745536522983 9.4807e-06 deg
tp 2458104.724992863947
(2017-Dec-17.22499286)
5.4955e-05 JED
period 2048.181475090852
5.61
7.2554e-06
1.986e-08
d
yr
n .1757656752481034 6.2262e-10 deg/d
Q 3.855470459804681 9.1049e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1575  
   data-arc span      56777 days (155.45 yr)  
   first obs. used      1860-10-25  
   last obs. used      2016-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57004  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:24:50  

Additional Information
 Earth MOID = 1.56729 au 
 Jupiter MOID = 1.95663 au 
 T_jup = 3.010 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.74 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
diameter diameter 255.90 km 11.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
rotation period rot_per 5.530 h n/a LCDB (Rev. 2016-February); 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 Bul. 36, 52-54.]
[Oey, J. (2010) Minor Planet Bul. 37, 135-136.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2012) Minor Planet Bul. 39, 57-60.]
[Pilcher, F. (2013) Minor Planet Bul. 40, 189.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2015) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.0543   0.005 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
B-V BV .687 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=7.43, mean=11.51, max.=13.73) deg.
U-B UB .317 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances ]
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