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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .15265356338608 3.7005e-08  
a 3.40797207045812 1.6077e-08 au
q 2.887732989982451 1.3033e-07 au
i 20.53365102719815 4.0316e-06 deg
node 252.0336544779311 9.1257e-06 deg
peri 38.68284912410947 1.4421e-05 deg
M 306.2546285703212 1.3654e-05 deg
tp 2459343.568651204214
(2021-May-09.06865120)
8.893e-05 TDB
period 2297.960013079686
6.29
1.6261e-05
4.452e-08
d
yr
n .1566606894597501 1.1086e-09 deg/d
Q 3.928211150933788 1.8532e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2692  
   data-arc span      37806 days (103.51 yr)  
   first obs. used      1916-12-14  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40053  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:20:37  

Additional Information
 Earth MOID = 1.89912 au 
 Jupiter MOID = 1.27584 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 8.1   n/a MPO473772 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. 2019-August); 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.]
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

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