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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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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 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .153601511267734 3.5915e-08  
a 3.411735252128769 1.3268e-08 au
q 2.887687561356387 1.2598e-07 au
i 20.52175439002159 3.9576e-06 deg
node 252.0160681415938 8.9619e-06 deg
peri 38.61313666092549 1.3748e-05 deg
M 8.348898314325279 1.2212e-05 deg
tp 2459343.118830775570
(2021-May-08.61883078)
7.7879e-05 TDB
period 2301.767274829704
6.30
1.3427e-05
3.676e-08
d
yr
n .1564015632408514 9.1236e-10 deg/d
Q 3.935782942901151 1.5306e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3008  
   data-arc span      38179 days (104.53 yr)  
   first obs. used      1916-12-14  
   last obs. used      2021-06-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38732  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:34:20  

Additional Information
 Earth MOID = 1.89881 au 
 Jupiter MOID = 1.26681 au 
 T_jup = 3.024 
[ 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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