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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07839201989374402 4.8028e-12  
a 2.765655253487926 1.0174e-11 au
q 2.548849951837263 1.9268e-11 au
i 10.58819557618916 4.6123e-09 deg
node 80.26763801181816 6.1799e-08 deg
peri 73.73826765873966 6.6149e-08 deg
M 247.5499723080229 7.0284e-09 deg
tp 2459921.250133264627
(2022-Dec-07.75013326)
3.1473e-08 TDB
period 1679.946655884585
4.60
9.2703e-09
2.538e-11
d
yr
n .2142925185981219 1.1825e-12 deg/d
Q 2.982460555138589 1.0972e-11 au
  Orbit Determination Parameters
   # obs. used (total)      1075  
   # delay obs. used      60  
   # Doppler obs. used      0  
   data-arc span      9520 days (26.06 yr)  
   first obs. used      1995-01-05  
   last obs. used      2021-01-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N373  
   condition code      0  
   norm. resid. RMS      .43153  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Apr-13 11:04:44  

Additional Information
 Earth MOID = 1.58524 au 
 Jupiter MOID = 2.09219 au 
 T_jup = 3.310 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458849.5 (2020-Jan-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07687465013145245 4.8246e-12  
q 2.556401146697176 1.9658e-11 au
tp 2458240.179130943422
(2018-May-01.67913094)
3.7261e-08 TDB
node 80.3011901917491 6.1719e-08 deg
peri 73.80896808746482 6.6182e-08 deg
i 10.59127767086216 4.6133e-09 deg
  Orbit Determination Parameters
   # obs. used (total)      1075  
   # delay obs. used      60  
   # Doppler obs. used      0  
   data-arc span      9520 days (26.06 yr)  
   first obs. used      1995-01-05  
   last obs. used      2021-01-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N373  
   condition code      0  
   norm. resid. RMS      .43153  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Apr-13 11:04:44  

Additional Information
 Jupiter MOID = 2.09219 au 
 T_jup = 3.310 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.327650478305363E-23 -8.519198646315575E-23 7.211333764876928E-20 -4.257547761521523E-20 5.549517002670901E-20 -6.792375020721875E-21
q -8.519198646315575E-23 3.86438559486018E-22 -4.270890417391854E-19 3.721480868054322E-19 -4.518834130890149E-19 2.947425379568005E-20
tp 7.211333764876928E-20 -4.270890417391854E-19 1.388363387201769E-15 -1.529450797047171E-15 1.78109388613556E-15 -4.022198324592541E-17
node -4.257547761521523E-20 3.721480868054322E-19 -1.529450797047171E-15 3.809189325197596E-15 -4.071379705096352E-15 7.015928646489075E-17
peri 5.549517002670901E-20 -4.518834130890149E-19 1.78109388613556E-15 -4.071379705096352E-15 4.380032482747052E-15 -7.731101572743104E-17
i -6.792375020721875E-21 2.947425379568005E-20 -4.022198324592541E-17 7.015928646489075E-17 -7.731101572743104E-17 2.128244450421824E-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 3.53   n/a E2021B10 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

[ show close-approach data ]
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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