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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .122496364975984 1.0561e-08  
a 2.646397165698291 8.4232e-09 au
q 2.322223132617503 3.111e-08 au
i 14.13776589518389 8.3421e-07 deg
node 49.52208517857745 3.0577e-06 deg
peri 184.1605486664726 9.9776e-06 deg
M 328.3610111593208 1.1771e-05 deg
tp 2459534.697776470041
(2021-Nov-16.19777647)
5.1624e-05 TDB
period 1572.46490334255
4.31
7.5075e-06
2.055e-08
d
yr
n .2289399268846999 1.093e-09 deg/d
Q 2.970571198779078 9.455e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5358  
   data-arc span      32973 days (90.28 yr)  
   first obs. used      1931-04-24  
   last obs. used      2021-08-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3097  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:25:17  

Additional Information
 Earth MOID = 1.31203 au 
 Jupiter MOID = 2.02 au 
 T_jup = 3.339 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456988.5 (2014-Nov-27.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1234655769746253 1.0521e-08  
q 2.319282144112209 3.0991e-08 au
tp 2456391.004701488059
(2013-Apr-08.50470149)
4.879e-05 TDB
node 49.5634002714206 3.0594e-06 deg
peri 184.3729539632394 9.9528e-06 deg
i 14.13529195575912 8.3416e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      5358  
   data-arc span      32973 days (90.28 yr)  
   first obs. used      1931-04-24  
   last obs. used      2021-08-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3097  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:25:17  

Additional Information
 Jupiter MOID = 2.02 au 
 T_jup = 3.339 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.106839206736212E-16 -3.177558255249304E-16 2.540466302707537E-16 1.216891908611566E-14 -1.222098733726399E-14 4.666553705181069E-15
q -3.177558255249304E-16 9.604551432320216E-16 9.713777979313194E-15 -3.320605810311994E-14 4.02651147949483E-14 -1.271459016128799E-14
tp 2.540466302707537E-16 9.713777979313194E-15 2.380454629344105E-9 -3.008107023147547E-12 4.660287751357625E-10 -8.455316093921035E-12
node 1.216891908611566E-14 -3.320605810311994E-14 -3.008107023147547E-12 9.360051902357558E-12 -8.59599336757585E-12 -6.463032954637874E-14
peri -1.222098733726399E-14 4.02651147949483E-14 4.660287751357625E-10 -8.59599336757585E-12 9.905904443825026E-11 -1.298827928452067E-12
i 4.666553705181069E-15 -1.271459016128799E-14 -8.455316093921035E-12 -6.463032954637874E-14 -1.298827928452067E-12 6.958169239485791E-13

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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