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790 Pretoria (1912 NW)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000790
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1510795953034494 3.604e-08  
a 3.411777149587043 2.1699e-08 AU
q 2.896327238561876 1.2608e-07 AU
i 20.52518861587833 4.2778e-06 deg
node 252.0528475716873 9.927e-06 deg
peri 38.72640546345553 1.5015e-05 deg
M 353.2059074905185 1.357e-05 deg
tp 2457043.940855195403
(2015-Jan-21.44085520)
8.7055e-05 JED
period 2301.809674878638
6.30
2.1959e-05
6.012e-08
d
yr
n .156398682275493 1.4921e-09 deg/d
Q 3.92722706061221 2.4977e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1359  
   data-arc span      33376 days (91.38 yr)  
   first obs. used      1924-01-05  
   last obs. used      2015-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52063  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:31:22  

Additional Information
 Earth MOID = 1.90905 AU 
 T_jup = 3.024 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.00 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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. 2015-May); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Stanzel, R. (1979) Astron. Astrophys. Suppl. Ser. 38, 265-268.]
[Warner, B.D. (2005) Minor Planet Bul. 32, 54-58.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2010) Minor Planet Bul. 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 .706 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=6.21, mean=9.23, max.=11.25) deg.
U-B UB .309 mag .049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 (1912 NW)          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
 1912 NW = 1970 HN 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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