+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2228536554798118 1.4333e-08   a 2.640279947447778 7.4834e-09 au q 2.051883909668995 3.7379e-08 au i 10.69789349657456 5.4242e-07 deg node 327.164419639432 5.0579e-06 deg peri 74.93580135711238 7.9174e-06 deg M 97.99369080828997 5.6679e-06 deg tp 2458773.950922336181 (2019-Oct-17.45092234) 2.428e-05 TDB period 1567.01586288231 4.29 6.6621e-06 1.824e-08 d yr n .2297360279032718 9.7671e-10 deg/d Q 3.228675985226561 9.1511e-09 au   Orbit Determination Parameters    # obs. used (total)      2644      data-arc span      33339 days (91.28 yr)      first obs. used      1929-12-06      last obs. used      2021-03-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39441      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:07:02   Additional Information  Earth MOID = 1.08887 au   Jupiter MOID = 2.33998 au   T_jup = 3.335  [ show covariance matrix ] [ 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 11.57   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.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 00:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin