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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2225082074141642 3.3299e-08  
a 2.639750479022495 8.607e-09 au
q 2.052384331914519 8.8431e-08 au
i 10.69713652820857 4.3442e-06 deg
node 327.1713971770957 2.1087e-05 deg
peri 74.96548848661985 2.3251e-05 deg
M 320.1284926947893 9.5681e-06 deg
tp 2458774.001365126741
(2019-Oct-17.50136513)
4.1794e-05 TDB
period 1566.544524326624
4.29
7.6617e-06
2.098e-08
d
yr
n .2298051503864821 1.1239e-09 deg/d
Q 3.227116626130472 1.0522e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1921  
   data-arc span      32835 days (89.90 yr)  
   first obs. used      1929-12-06  
   last obs. used      2019-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44057  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:02:21  

Additional Information
 Earth MOID = 1.08979 au 
 Jupiter MOID = 2.33881 au 
 T_jup = 3.336 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456288.5 (2012-Dec-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2215158719986413 3.3001e-08  
q 2.055716296459101 8.7434e-08 au
tp 2455634.561276660574
(2011-Mar-14.06127666)
4.1671e-05 TDB
node 327.4406495621162 2.1017e-05 deg
peri 73.9831498282432 2.3291e-05 deg
i 10.71752066292321 4.3484e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1921  
   data-arc span      32835 days (89.90 yr)  
   first obs. used      1929-12-06  
   last obs. used      2019-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44057  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:02:21  

Additional Information
 Jupiter MOID = 2.33881 au 
 T_jup = 3.336 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.089098873509278E-15 -2.877031624887884E-15 1.668613492901773E-13 2.054879079598713E-15 2.839330777000182E-14 -2.319101908327535E-15
q -2.877031624887884E-15 7.644700486284414E-15 -4.711575727637473E-13 -5.431176320006222E-15 -7.722349053902891E-14 6.201498783957266E-15
tp 1.668613492901773E-13 -4.711575727637473E-13 1.736440157508582E-9 6.10807299455792E-13 4.311757238883506E-10 -2.127260268097925E-12
node 2.054879079598713E-15 -5.431176320006222E-15 6.10807299455792E-13 4.417013092144918E-10 -4.334927496440723E-10 -8.910110343501232E-12
peri 2.839330777000182E-14 -7.722349053902891E-14 4.311757238883506E-10 -4.334927496440723E-10 5.424500716267445E-10 8.319857763833008E-12
i -2.319101908327535E-15 6.201498783957266E-15 -2.127260268097925E-12 -8.910110343501232E-12 8.319857763833008E-12 1.890892429934038E-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-January); 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.]
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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