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

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2455400.5 (2010-Jul-23.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07913825487621974 1.8987e-08  
a 2.765348506018043 1.5886e-09 AU
q 2.546503651127214 5.275e-08 AU
i 10.58682160714853 2.2048e-06 deg
node 80.39319901972638 1.1593e-05 deg
peri 72.58981198193074 1.84e-05 deg
M 113.4104433863731 1.4429e-05 deg
tp 2454871.356114851120
(2009-Feb-08.85611485)		 6.7252e-05 JED
period 1679.667171431635
4.60		 1.4473e-06
3.962e-09		 d
yr
n .2143281753212812 1.8468e-10 deg/d
Q 2.984193360908873 1.7143e-09 AU
   Orbit Determination Parameters
   # obs. used (total)      6354  
   data-arc span      76247 days (208.75 yr)  
   first obs. used      1802-01-27  
   last obs. used      2010-10-30  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-3O  
   condition code      0  
   fit RMS      .63834  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2011-Feb-04 09:49:43  

Additional Information
 Earth MOID = 1.5833 AU 
 T_jup = 3.310 
[ 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 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. 2013-May-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

Alternate Designations
 1943 XB = A899 OF 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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