+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1431 Luanda (1937 OB) Classification: Main-belt Asteroid          SPK-ID: 2001431 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1833969410450565 3.5977e-08   a 2.619932897127569 8.439e-09 au q 2.139445218051061 9.2832e-08 au i 13.98948395299397 3.4614e-06 deg node 117.716245381037 1.4696e-05 deg peri 224.2536519055145 1.7425e-05 deg M 165.8986809753389 1.1147e-05 deg tp 2458286.703997646841 (2018-Jun-17.20399765) 4.681e-05 TDB period 1548.936732567125 4.24 7.4838e-06 2.049e-08 d yr n .2324174980364468 1.1229e-09 deg/d Q 3.100420576204078 9.9866e-09 au   Orbit Determination Parameters    # obs. used (total)      2891      data-arc span      30441 days (83.34 yr)      first obs. used      1937-07-12      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41235      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:38:54   Additional Information  Earth MOID = 1.15162 au   Jupiter MOID = 2.31536 au   T_jup = 3.340  [ 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 11.7   n/a MPO502167   diameter diameter 13.608 km 1.966 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 4.141 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.360   0.347 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1431 Luanda           Discovered 1937 July 29 by C. Jackson at Johannesburg. Named for the capital city of Angola. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5182 Last Updated: 2006-03-21 [ show close-approach data ] Alternate Designations  1937 OB = 1949 KZ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 05:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin