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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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2227441190806833 3.313e-08  
a 2.640406437509998 7.8782e-09 au
q 2.052271431571868 8.7901e-08 au
i 10.69726231877978 3.7852e-06 deg
node 327.1649596740916 2.0879e-05 deg
peri 74.95619730862028 2.2822e-05 deg
M 52.04004436232525 8.1957e-06 deg
tp 2458773.962679885740
(2019-Oct-17.46267989)
3.5681e-05 TDB
period 1567.128472706967
4.29
7.0138e-06
1.92e-08
d
yr
n .2297195196627095 1.0281e-09 deg/d
Q 3.228541443448127 9.633e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2282  
   data-arc span      33006 days (90.37 yr)  
   first obs. used      1929-12-06  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41188  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:20:35  

Additional Information
 Earth MOID = 1.09024 au 
 Jupiter MOID = 2.33904 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456617.5 (2013-Nov-21.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2212434006598303 3.2844e-08  
q 2.056867057173561 8.6891e-08 au
tp 2457202.373292777750
(2015-Jun-28.87329278)
3.7145e-05 TDB
node 327.4223654704428 2.0811e-05 deg
peri 74.03123453962479 2.2869e-05 deg
i 10.71681747699345 3.7883e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2282  
   data-arc span      33006 days (90.37 yr)  
   first obs. used      1929-12-06  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41188  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:20:35  

Additional Information
 Jupiter MOID = 2.33904 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.078760655952815E-15 -2.846981083307615E-15 1.845570945183642E-13 3.848864292452292E-15 2.976912304863704E-14 -3.995167666540872E-15
q -2.846981083307615E-15 7.550072831631335E-15 -5.212254548562861E-13 -1.0438550773742E-14 -9.045512522544828E-14 1.075701031263714E-14
tp 1.845570945183642E-13 -5.212254548562861E-13 1.379779937493922E-9 9.2569456441656E-13 3.668381259893087E-10 -1.823200612170117E-12
node 3.848864292452292E-15 -1.0438550773742E-14 9.2569456441656E-13 4.330926217636688E-10 -4.249343724433348E-10 -9.612404609513572E-12
peri 2.976912304863704E-14 -9.045512522544828E-14 3.668381259893087E-10 -4.249343724433348E-10 5.230108200785788E-10 8.996756956195106E-12
i -3.995167666540872E-15 1.075701031263714E-14 -1.823200612170117E-12 -9.612404609513572E-12 8.996756956195106E-12 1.43514681135759E-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. 2019-August); 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1943-Mar-30 05:26 00:01 Amphi 0.0462215179917957 0.0462175942022169 0.0462254419322434 3.28066206894357 3.28066203103238 2430813.726278893 1.00207056801495 237.187423836271 39.6225609893814 -35.0551423762544 102955.530986511 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:20:45 2020-May-20 01:20
1947-Sep-28 10:09 < 00:01 Hebe 0.0153009323083636 0.0152974243705893 0.0153044405143989 7.8270583911019 7.82705833919309 2432456.923123861 0.532091182179795 202.733913482292 29.845219108146 30.7460256713881 40382.4481172966 T 34 CATAB v2.0f-lin.ifort 2020-May-20 01:20:45 2020-May-20 01:20
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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