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1187 Afra (1929 XC)
Classification: Main-belt Asteroid          SPK-ID: 2001187
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2228536555218956 1.4322e-08  
a 2.640279947141978 7.4601e-09 au
q 2.051883909320231 3.7333e-08 au
i 10.69789350082211 5.4237e-07 deg
node 327.1644196085854 5.0536e-06 deg
peri 74.93580171170053 7.8812e-06 deg
M 97.99369061213538 5.6421e-06 deg
tp 2458773.950923264112
(2019-Oct-17.45092326)
2.4151e-05 TDB
period 1567.01586261007
4.29
6.6414e-06
1.818e-08
d
yr
n .2297360279431842 9.7367e-10 deg/d
Q 3.228675984963725 9.1226e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2698  
   data-arc span      33345 days (91.29 yr)  
   first obs. used      1929-12-06  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39282  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:15:36  

Additional Information
 Earth MOID = 1.08887 au 
 Jupiter MOID = 2.33998 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456964.5 (2014-Nov-03.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2210375677971241 1.4156e-08  
q 2.057450173536804 3.675e-08 au
tp 2457202.499883140955
(2015-Jun-28.99988314)
2.4237e-05 TDB
node 327.4156802345075 5.0468e-06 deg
peri 74.03961861966805 7.9697e-06 deg
i 10.71776634964174 5.4324e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2698  
   data-arc span      33345 days (91.29 yr)  
   first obs. used      1929-12-06  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39282  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:15:36  

Additional Information
 Jupiter MOID = 2.33998 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.003862747252748E-16 -5.139320580279799E-16 1.12389573243693E-13 4.755279624275802E-14 -3.002389410561078E-14 9.635970585919603E-16
q -5.139320580279799E-16 1.35052890441723E-15 -3.032414484079612E-13 -1.251276120812398E-13 7.662377879361373E-14 -2.538912238086527E-15
tp 1.12389573243693E-13 -3.032414484079612E-13 5.874086180313568E-10 1.613609844957643E-11 1.377294133022761E-10 6.204490833529617E-13
node 4.755279624275802E-14 -1.251276120812398E-13 1.613609844957643E-11 2.54706056257564E-11 -2.360733215378553E-11 2.741312896595464E-13
peri -3.002389410561078E-14 7.662377879361373E-14 1.377294133022761E-10 -2.360733215378553E-11 6.351683124508687E-11 -1.355806179856288E-13
i 9.635970585919603E-16 -2.538912238086527E-15 6.204490833529617E-13 2.741312896595464E-13 -1.355806179856288E-13 2.951123451261086E-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 11.57   n/a E2021B10  
diameter diameter 32.348 km 0.299 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 14.0701 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Menke, J.; Cooney, W.; Gross, J.; Terrell, D. (2008) Minor Planet Bull. 35, 155-160.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Clark, M. (2019) Minor Planet Bull. 46, 346-349.]
geometric albedo albedo 0.051   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1187 Afra (1929 XC)          Discovered 1929-Dec-06 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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