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34 Circe (A855 GA)
Classification: Main-belt Asteroid          SPK-ID: 2000034
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 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1064452418827236 2.198e-08  
a 2.686002505122247 4.8251e-09 au
q 2.400090318766908 5.9173e-08 au
i 5.49733185371408 2.4607e-06 deg
node 184.3439816359392 3.2865e-05 deg
peri 330.4944434745367 3.6176e-05 deg
M 216.4433899425684 1.5781e-05 deg
tp 2459641.678189039411
7.1033e-05 TDB
period 1607.896341114797
n .2238950302918176 6.0331e-10 deg/d
Q 2.971914691477586 5.3387e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3685  
   data-arc span      57161 days (156.50 yr)  
   first obs. used      1864-04-28  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46367  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:10  

Additional Information
 Earth MOID = 1.41137 au 
 Jupiter MOID = 2.01948 au 
 T_jup = 3.359 
[ 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 8.6   n/a MPO502153 IRAS observations used: 19
diameter diameter 132.992 km 1.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.15 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Vesely, C.D.; Taylor, R.C. (1985) Icarus 64, 37-52.]
[Magnusson, P.; Lagerkvist, C.-I. (1991) Astron. Astrophys. Suppl. Ser. 87, 269-275.]
[Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; et al. (1995) Astron. Astrophys. Suppl. Ser. 113, 115-129.]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.]
[Uzpen, B.; Kipp, S. (2003) Minor Planet Bull. 30, 59-61.]
[Pilcher, F. (2008) Minor Planet Bull. 35, 135-138.]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Behrend, R. (2010) Observatoire de Geneve web site,]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.023   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.707   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.42, mean=12.73, max.=21.25) deg.
U-B UB 0.357   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.42, mean=12.73, max.=21.25) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   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)

34 Circe (A855 GA)          Discovered 1855-Apr-06 by Chacornac, J. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A855 GA = 1965 JL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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