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2 Pallas
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2303368211958249 3.3346e-08  
a 2.772465921978979 4.086e-09 au
q 2.133864934636589 9.2077e-08 au
i 34.8362344173523 3.7015e-06 deg
node 173.0800627473217 6.416e-06 deg
peri 310.0488574270735 9.486e-06 deg
M 59.69913274585711 9.0521e-06 deg
tp 2458320.883192251743
(2018-Jul-21.38319225)
4.2112e-05 TDB
period 1686.155998578693
4.62
3.7275e-06
1.021e-08
d
yr
n .2135033770917126 4.7198e-10 deg/d
Q 3.41106690932137 5.0271e-09 au
  Orbit Determination Parameters
   # obs. used (total)      8490  
   data-arc span      72318 days (198.00 yr)  
   first obs. used      1821-05-09  
   last obs. used      2019-05-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36151  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:01:46  

Additional Information
 Earth MOID = 1.23324 au 
 Jupiter MOID = 1.85493 au 
 T_jup = 3.043 
[ 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 4.13   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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          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 1.85221326634652 1.85221297446245 1.85221355823101 8.9302934984577 8.87893778272457 2420701.783269396 0.354321810132755 125.089508096017 13.5794889076506 87.7052203977856 7849148.51128344 T 35 CATAB v2.0e-lin.ifort 2019-May-29 19:02:11 2019-May-29 19:02
1998-Aug-03 02:52 < 00:01 Jupiter 1.85307321630424 1.85307292981727 1.8530735027912 8.94912398788899 8.89790080692085 2451028.619782319 0.11725475186876 59.0367844781253 13.4386158963547 85.4699134009337 7845335.14629861 T 35 CATAB v2.0e-lin.ifort 2019-May-29 19:02:11 2019-May-29 19:02
2081-Aug-13 10:58 < 00:01 Jupiter 1.85132109102095 1.85132079638371 1.8513213856586 8.96695756962535 8.91578832611625 2481354.957062081 0.388827889754157 138.56495460092 13.7921615787859 88.0210488137319 7745065.95601717 T 35 CATAB v2.0e-lin.ifort 2019-May-29 19:02:11 2019-May-29 19:02
2164-Aug-25 07:54 < 00:01 Jupiter 1.85809325978396 1.85809294048887 1.85809357908222 8.98183509944198 8.93093781373454 2511681.828900405 0.737013181251764 253.188767099104 13.8903382599733 88.2801258833424 7688753.60797901 T 35 CATAB v2.0e-lin.ifort 2019-May-29 19:02:11 2019-May-29 19:02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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