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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2299722588646258 3.1934e-08  
a 2.773841434873298 4.0337e-09 au
q 2.135934854363191 8.8322e-08 au
i 34.83293159121413 3.4694e-06 deg
node 173.0247412488342 6.2724e-06 deg
peri 310.2023924446679 9.1282e-06 deg
M 144.9756754788195 8.8591e-06 deg
tp 2458320.962365774508
(2018-Jul-21.46236577)
4.0787e-05 TDB
period 1687.410991624711
4.62
3.6807e-06
1.008e-08
d
yr
n .213344586343708 4.6536e-10 deg/d
Q 3.411748015383405 4.9613e-09 au
  Orbit Determination Parameters
   # obs. used (total)      8477  
   data-arc span      78764 days (215.64 yr)  
   first obs. used      1804-08-27  
   last obs. used      2020-04-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35936  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:55:48  

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1915-Jul-23 06:48 < 00:01 Jupiter 1.85221323105919 1.85221295298319 1.8522135091355 8.93029310672047 8.87893738774032 2420701.783259748 0.347906432409591 122.348782673329 12.9600319751558 87.79698713707 8296076.67188137 T 37 CATAB v2.0f-lin.ifort 2020-May-20 00:57:10 2020-May-20 00:57
1998-Aug-03 02:52 < 00:01 Jupiter 1.85307318332445 1.85307291095554 1.85307345569347 8.9491234182295 8.8979002330677 2451028.619769487 0.115397492303322 57.1194449916286 12.8920071104971 85.9270813850431 8304186.64057427 T 37 CATAB v2.0f-lin.ifort 2020-May-20 00:57:10 2020-May-20 00:57
2081-Aug-13 10:58 < 00:01 Jupiter 1.85132105953408 1.8513207791813 1.85132133988729 8.96695710604801 8.91578785900559 2481354.957073343 0.383588310697234 136.301164024322 13.1548852215865 88.1266658689204 8189701.46538469 T 37 CATAB v2.0f-lin.ifort 2020-May-20 00:57:10 2020-May-20 00:57
2164-Aug-25 07:54 < 00:01 Jupiter 1.858093230263 1.85809292512991 1.85809353539914 8.98183461204075 8.93093732274467 2511681.828920942 0.726214764724591 249.292224649132 13.2363700059602 88.3149296520776 8129571.70414892 T 37 CATAB v2.0f-lin.ifort 2020-May-20 00:57:10 2020-May-20 00:57
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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