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2 Pallas (A802 FA)
Classification: Main-belt Asteroid          SPK-ID: 2000002
[ 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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2299722589083967 3.1928e-08  
a 2.773841434936674 4.0255e-09 au
q 2.135934854290579 8.8299e-08 au
i 34.83293128848382 3.4609e-06 deg
node 173.0247411471266 6.271e-06 deg
peri 310.2023924322255 9.1174e-06 deg
M 144.9756755196254 8.859e-06 deg
tp 2458320.962365559951
(2018-Jul-21.46236556)		 4.0786e-05 TDB
period 1687.410991682541
4.62		 3.6733e-06
1.006e-08		 d
yr
n .2133445863363963 4.6442e-10 deg/d
Q 3.41174801558277 4.9513e-09 au
   Orbit Determination Parameters
   # obs. used (total)      8516  
   data-arc span      78910 days (216.04 yr)  
   first obs. used      1804-08-27  
   last obs. used      2020-09-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35927  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:32  

Additional Information
 Earth MOID = 1.23429 au 
 Jupiter MOID = 1.85093 au 
 T_jup = 3.042 
[ hide covariance matrix ]
Orbital Elements at Epoch 2449869.5 (1995-Jun-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2338676500676366 3.2345e-08  
q 2.123202293266447 8.9847e-08 au
tp 2449888.238155414409
(1995-Jun-19.73815541)		 3.4486e-05 TDB
node 173.2995312603382 6.2849e-06 deg
peri 309.6980177932602 8.9168e-06 deg
i 34.80686189209164 3.4641e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      8516  
   data-arc span      78910 days (216.04 yr)  
   first obs. used      1804-08-27  
   last obs. used      2020-09-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35927  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:32  

Additional Information
 Jupiter MOID = 1.85093 au 
 T_jup = 3.042 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.046216771888915E-15 -2.904368193548227E-15 -5.934098507441383E-14 1.755840058066685E-16 -6.799536015370227E-15 5.960988600407968E-16
q -2.904368193548227E-15 8.072455066651429E-15 1.755675762105371E-13 9.234796949925323E-16 1.994371700931094E-14 -1.261244335644217E-15
tp -5.934098507441383E-14 1.755675762105371E-13 1.189314610532571E-9 1.958518740832505E-12 2.341622059023045E-10 -3.576404566179843E-13
node 1.755840058066685E-16 9.234796949925323E-16 1.958518740832505E-12 3.950023871377257E-11 -3.249204694722007E-11 -2.702548557415738E-12
peri -6.799536015370227E-15 1.994371700931094E-14 2.341622059023045E-10 -3.249204694722007E-11 7.950932247827096E-11 2.040696248115611E-12
i 5.960988600407968E-16 -1.261244335644217E-15 -3.576404566179843E-13 -2.702548557415738E-12 2.040696248115611E-12 1.200031590531255E-11

[ 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 4.2   n/a MPO492748 IRAS observations used: 19
magnitude slope G 0.11   n/a PDS3 (MPC 17257) Fit
diameter diameter 545 km 18 see ref. for extent computed from extent=582x556x500 km
extent extent 582x556x500 km 18 Schmidt et al. 2008, LPSC XXXIX  
GM GM 14.3 km^3/s^2 n/a JPL IOM 312.F01-006  
rotation period rot_per 7.8132 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schroll, A.; Haupt, H.F.; Maitzen, H.M. (1976) Icarus 27, 147-156.]
[Chang, Y.C.; Zhou, X.-h.; Yang, X.-y.; Zhang, Y.-y.; et al. (1981) Acta Astron. Sin. 22, 169-173; Chin. Astron. Astrophys. 5, 434-437.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Higley, S.; Hardersen, P.; Dyvig, R. (2008) Minor Planet Bull. 35, 63-66.]
[Carry, B.; Dumas, C.; Kaasalainen, M.; Berthier, J.; et al. (2010) Icarus 205, 460-472.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.101   0.008 EAR_A_COMPIL_5_NEOWISEDIAM_V1_0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.635   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=32; phase (min.=.19, mean=13.73, max.=25.65) deg.
U-B UB 0.284   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=14; phase (min.=7.23, mean=14.81, max.=25.65) deg.
Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   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)

2 Pallas (A802 FA)          Discovered 1802-Mar-28 by Olbers, H. W. at Bremen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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