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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2297584173660096 3.1811e-08  
a 2.773814787697288 4.4694e-09 au
q 2.136507492009525 8.7902e-08 au
i 34.89778042691763 3.4489e-06 deg
node 172.9201794613645 6.2478e-06 deg
peri 310.4368612168902 9.125e-06 deg
M 229.2297175579057 8.871e-06 deg
tp 2460009.444534012679
(2023-Mar-05.94453401)
4.2255e-05 TDB
period 1687.38667626778
4.62
4.0783e-06
1.117e-08
d
yr
n .2133476606537278 5.1565e-10 deg/d
Q 3.411122083385051 5.4963e-09 au
  Orbit Determination Parameters
   # obs. used (total)      8973  
   data-arc span      79216 days (216.88 yr)  
   first obs. used      1804-08-27  
   last obs. used      2021-07-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35624  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:03:20  

Additional Information
 Earth MOID = 1.23484 au 
 Jupiter MOID = 1.84778 au 
 T_jup = 3.042 
[ hide covariance matrix ]
Orbital Elements at Epoch 2449839.5 (1995-May-02.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2338826997006639 3.2289e-08  
q 2.123200962472864 8.9675e-08 au
tp 2449888.239629375882
(1995-Jun-19.73962938)
3.4402e-05 TDB
node 173.300212580309 6.2674e-06 deg
peri 309.6980589651054 8.8887e-06 deg
i 34.80665776759903 3.4547e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      8973  
   data-arc span      79216 days (216.88 yr)  
   first obs. used      1804-08-27  
   last obs. used      2021-07-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35624  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:03:20  

Additional Information
 Jupiter MOID = 1.84778 au 
 T_jup = 3.042 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.042590803210874E-15 -2.893961623016942E-15 -5.967260837178163E-14 1.903557925304778E-16 -6.78417980063871E-15 5.755138266137103E-16
q -2.893961623016942E-15 8.041660413897923E-15 1.772103942746363E-13 9.251344186815796E-16 1.996930443100849E-14 -1.222123863844161E-15
tp -5.967260837178163E-14 1.772103942746363E-13 1.183501139664505E-9 1.903822149960644E-12 2.327853165506554E-10 -3.367852751319666E-13
node 1.903557925304778E-16 9.251344186815796E-16 1.903822149960644E-12 3.92805115648621E-11 -3.23199143896233E-11 -2.753070034453768E-12
peri -6.78417980063871E-15 1.996930443100849E-14 2.327853165506554E-10 -3.23199143896233E-11 7.900916522516228E-11 2.088202411117699E-12
i 5.755138266137103E-16 -1.222123863844161E-15 -3.367852751319666E-13 -2.753070034453768E-12 2.088202411117699E-12 1.193492842716343E-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 4.22   n/a MPO636060 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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