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1193 Africa (1931 HB)
Classification: Main-belt Asteroid          SPK-ID: 2001193
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1226216040873169 1.0582e-08  
a 2.646852077292718 8.8296e-09 au
q 2.322290829793238 3.1238e-08 au
i 14.13703167463792 8.3895e-07 deg
node 49.52807744306224 3.0618e-06 deg
peri 184.1045759765334 1.0718e-05 deg
M 283.5513713735926 1.2869e-05 deg
tp 2459534.510509290430
(2021-Nov-16.01050929)		 5.6887e-05 TDB
period 1572.870377206729
4.31		 7.8704e-06
2.155e-08		 d
yr
n .2288809079355454 1.1453e-09 deg/d
Q 2.971413324792198 9.9123e-09 au
   Orbit Determination Parameters
   # obs. used (total)      5092  
   data-arc span      32833 days (89.89 yr)  
   first obs. used      1931-04-24  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .31277  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:07:25  

Additional Information
 Earth MOID = 1.31039 au 
 Jupiter MOID = 2.02027 au 
 T_jup = 3.339 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.93   n/a E2021B10  
diameter diameter 12.220 km 0.102 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 158.7 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Benishek, V. (2018) Minor Planet Bull. 45, 82-91.]
[McNeill, A.; Mommert, M.; Trilling, D.E.; Llama, J.; Skiff, B. (2019) Ap. J. Suppl. Series 245, id.29.]
geometric albedo albedo 0.247   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1193 Africa (1931 HB)          Discovered 1931-Apr-24 by Jackson, C. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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