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790 Pretoria (A912 BE)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000790
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1529502537551835 3.6662e-08  
a 3.409086375153753 1.5197e-08 au
q 2.887665749000648 1.2949e-07 au
i 20.53131295472744 4.0106e-06 deg
node 252.0339977937562 9.0224e-06 deg
peri 38.64789088876721 1.4325e-05 deg
M 337.629075057362 1.3567e-05 deg
tp 2459343.368628047706
(2021-May-08.86862805)
8.7332e-05 TDB
period 2299.087151248979
6.29
1.5373e-05
4.209e-08
d
yr
n .1565838858280905 1.047e-09 deg/d
Q 3.930507001306858 1.7521e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2807  
   data-arc span      37913 days (103.80 yr)  
   first obs. used      1916-12-14  
   last obs. used      2020-10-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39634  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-23 18:14:34  

Additional Information
 Earth MOID = 1.8972 au 
 Jupiter MOID = 1.2728 au 
 T_jup = 3.025 
[ 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 8.11   n/a E2021B10 IRAS observations used: 24
diameter diameter 170.37 km 2.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
rotation period rot_per 10.37 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Stanzel, R. (1979) Astron. Astrophys. Suppl. Ser. 38, 265-268.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2005) Minor Planet Bull. 32, 54-58.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2010) Minor Planet Bull. 37, 24-27.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.0384   0.001 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 24
B-V BV 0.706   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.21, mean=9.23, max.=11.25) deg.
U-B UB 0.309   0.049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.21, mean=9.23, max.=11.25) deg.
Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

790 Pretoria (A912 BE)          Discovered 1912-Jan-16 by Wood, H. E. at Johannesburg (UO)
and K. Van der Spuy.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A912 BE = 1970 HN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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