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1 Ceres
Classification: Main-belt Asteroid          SPK-ID: 2000001
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07582276595896797 3.0776e-08  
a 2.76750591440571 2.9718e-09 AU
q 2.557665961167666 8.4935e-08 AU
i 10.59338616262872 3.8175e-06 deg
node 80.32926547452543 1.9936e-05 deg
peri 72.52203270043788 3.1113e-05 deg
M 95.98917578768719 2.4717e-05 deg
tp 2456552.115051939344
(2013-Sep-16.61505194)
0.00011527 JED
period 1681.633163085685
4.60
2.7087e-06
7.416e-09
d
yr
n .2140776049750494 3.4482e-10 deg/d
Q 2.977345867643754 3.1971e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      6461  
   data-arc span      67279 days (184.20 yr)  
   first obs. used      1830-04-18  
   last obs. used      2014-07-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .38826  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2014-Jul-16 12:44:28  

Additional Information
 Earth MOID = 1.59376 AU 
 T_jup = 3.310 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 3.34 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
magnitude slope G 0.12   n/a PDS3 (MPC 17257) Fit
diameter diameter 952.4 km n/a Thomas et al. (2005) Nature v437:pp224-226 from a sphere with volume equivalent to an oblate spheroid with semi-axes a=487.3, b=454.7 km
extent extent 974.6 x 909.4 km 3.6 x 3.2 Thomas et al. (2005) Nature v437:pp224-226 oblate spheroid (semi-axes: a=487.3 +/- 1.8; b=454.7 +/- 1.6 km)
GM GM 63.2 km^3/s^2 n/a JPL IOM 312.F01-006  
rotation period rot_per 9.074170 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) sidereal period (not synodic)
Published Reference List:
[Ahmad, I.I. (1954) Astrophys. J. 120, 551-560.]
[Taylor, R.C.; Gehrels, T.; Capen, R.C. (1976) Astron. J. 81, 778-786.]
[Tedesco, E.F.; Taylor, R.C.; Drummond, J.; Harwood, D.; et al. (1983) Icarus 54, 23-29.]
[Chamberlain, M.A.; Sykes, M.V.; Esquerdo, G.A. (2007) Icarus 188, 451-456.]
geometric albedo albedo 0.090   0.003 Li et al. (2006) Icarus v182:pp143-160 V-band geometric albedo
B-V BV .713 mag .014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=52; phase (min.=1.47, mean=11.85, max.=22.59) deg.
U-B UB .426 mag .026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=52; phase (min.=1.47, mean=12.16, max.=22.59) deg.
Tholen spectral type spec_T G   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

1 Ceres          Discovered 1801-Jan-01 by Piazzi, G. at Palermo
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1943 XB = A899 OF 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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