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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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.

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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 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 
[ show covariance matrix ]

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. 2019-August); 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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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