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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 | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2227441212411248 3.3024e-08  
a 2.640406437018972 7.8575e-09 au
q 2.052271425485772 8.7588e-08 au
i 10.69726236283529 3.7831e-06 deg
node 327.1649589461314 2.0786e-05 deg
peri 74.95619859588903 2.2724e-05 deg
M 52.04004412235611 8.1788e-06 deg
tp 2458773.962680993550
(2019-Oct-17.46268099)
3.5604e-05 TDB
period 1567.128472269819
4.29
6.9953e-06
1.915e-08
d
yr
n .2297195197267895 1.0254e-09 deg/d
Q 3.228541448552172 9.6077e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2335  
   data-arc span      33218 days (90.95 yr)  
   first obs. used      1929-12-06  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40876  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:58:59  

Additional Information
 Earth MOID = 1.09024 au 
 Jupiter MOID = 2.33904 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456652.5 (2013-Dec-26.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2212160607851072 3.2744e-08  
q 2.056959360840725 8.6593e-08 au
tp 2457202.404307491655
(2015-Jun-28.90430749)
3.7044e-05 TDB
node 327.4204718692692 2.0718e-05 deg
peri 74.03517858744317 2.2771e-05 deg
i 10.71692867949013 3.7863e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2335  
   data-arc span      33218 days (90.95 yr)  
   first obs. used      1929-12-06  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40876  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:58:59  

Additional Information
 Jupiter MOID = 2.33904 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.072146801973531E-15 -2.828491443500279E-15 1.785437030469295E-13 3.914858660618971E-15 2.761764430123483E-14 -3.953526435302104E-15
q -2.828491443500279E-15 7.498398751827446E-15 -5.046294213167619E-13 -1.06373942105218E-14 -8.449786195223302E-14 1.064482848433515E-14
tp 1.785437030469295E-13 -5.046294213167619E-13 1.372277255118919E-9 8.530841025573791E-13 3.644824912668938E-10 -1.777017107801171E-12
node 3.914858660618971E-15 -1.06373942105218E-14 8.530841025573791E-13 4.292398473928618E-10 -4.21168226725023E-10 -9.552326260302168E-12
peri 2.761764430123483E-14 -8.449786195223302E-14 3.644824912668938E-10 -4.21168226725023E-10 5.185351860534214E-10 8.952610213309191E-12
i -3.953526435302104E-15 1.064482848433515E-14 -1.777017107801171E-12 -9.552326260302168E-12 8.952610213309191E-12 1.433615667558928E-11

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 11.5   n/a MPO384757  
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

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