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1 Ceres (A801 AA)
Classification: Main-belt Asteroid          SPK-ID: 2000001
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0760090265983052 4.819e-12  
a 2.769165148633284 1.0328e-11 au
q 2.558683601195717 1.9569e-11 au
i 10.59406719506626 4.6089e-09 deg
node 80.30553090445737 6.1688e-08 deg
peri 73.59769469844186 6.6248e-08 deg
M 77.37209751948711 7.8207e-09 deg
tp 2458238.754129317955
(2018-Apr-30.25412932)
3.7829e-08 TDB
period 1683.145702657688
4.61
9.4159e-09
2.578e-11
d
yr
n .2138852265918273 1.1965e-12 deg/d
Q 2.979646696070851 1.1113e-11 au
  Orbit Determination Parameters
   # obs. used (total)      1030  
   # delay obs. used      60  
   # Doppler obs. used      0  
   data-arc span      9242 days (25.30 yr)  
   first obs. used      1995-01-05  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43301  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-May-20 11:11:55  

Additional Information
 Earth MOID = 1.59478 au 
 Jupiter MOID = 2.09753 au 
 T_jup = 3.309 
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Orbital Elements at Epoch 2454061.5 (2006-Nov-22.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07985681703215082 4.8578e-12  
q 2.544823927206557 1.9871e-11 au
tp 2454873.577466874360
(2009-Feb-11.07746687)
5.1058e-08 TDB
node 80.40822338295483 6.1848e-08 deg
peri 73.18422155550952 6.6271e-08 deg
i 10.58670363476912 4.5979e-09 deg
  Orbit Determination Parameters
   # obs. used (total)      1030  
   # delay obs. used      60  
   # Doppler obs. used      0  
   data-arc span      9242 days (25.30 yr)  
   first obs. used      1995-01-05  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43301  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-May-20 11:11:55  

Additional Information
 Jupiter MOID = 2.09753 au 
 T_jup = 3.309 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.359855874631572E-23 -8.695361032962282E-23 1.208421141494666E-19 -5.752103605452016E-20 7.176357618693562E-20 -7.37165974491845E-21
q -8.695361032962282E-23 3.948496406922794E-22 -7.52723559072912E-19 4.326836565232641E-19 -5.174844807098064E-19 3.190166506359861E-20
tp 1.208421141494666E-19 -7.52723559072912E-19 2.60696099666617E-15 -2.02592544410749E-15 2.358518177553071E-15 -5.982491936646754E-17
node -5.752103605452016E-20 4.326836565232641E-19 -2.02592544410749E-15 3.825201677486454E-15 -4.085789540417782E-15 6.727403981601215E-17
peri 7.176357618693562E-20 -5.174844807098064E-19 2.358518177553071E-15 -4.085789540417782E-15 4.391836730388851E-15 -7.421058325712381E-17
i -7.37165974491845E-21 3.190166506359861E-20 -5.982491936646754E-17 6.727403981601215E-17 -7.421058325712381E-17 2.114083693801487E-17

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 3.4   n/a MPO492748 IRAS observations used: 15
magnitude slope G 0.12   n/a PDS3 (MPC 17257) Fit
diameter diameter 939.4 km 0.2 Nature vol. 537, pp515-517 (22 September 2016)  
extent extent 964.4 x 964.2 x 891.8 km 0.2 x 0.2 x 0.2 Nature vol. 537, pp515-517 (22 September 2016) fit w.r.t. center of mass and in body-fixed frame
GM GM 62.6284 km^3/s^2 0.0009 Nature vol. 537, pp515-517 (22 September 2016)  
bulk density density 2.162 g/cm^3 0.008 Nature vol. 537, pp515-517 (22 September 2016)  
rotation period rot_per 9.074170 h 0.000001 Nature vol. 537, pp515-517 (22 September 2016) derived from published value: 952.1532 +/- 0.0001 deg./day
pole direction pole 291.421/66.758   0.007/0.002 Nature vol. 537, pp515-517 (22 September 2016)  
geometric albedo albedo 0.090   0.003 Li et al. (2006) Icarus v182:pp143-160 V-band geometric albedo
B-V BV 0.713   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=52; phase (min.=1.47, mean=11.85, max.=22.59) deg.
U-B UB 0.426   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A801 AA)          Discovered 1801-Jan-01 by Piazzi, G. at Palermo
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A801 AA = 1943 XB = A899 OF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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