+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1428 Mombasa (1937 NO) Classification: Main-belt Asteroid          SPK-ID: 2001428 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1413060899419311 3.891e-08   a 2.809182322391689 1.053e-08 au q 2.412227752480526 1.0773e-07 au i 17.30653958765105 4.1502e-06 deg node 115.709427779357 1.3584e-05 deg peri 252.4648950409876 1.9951e-05 deg M 196.86885504464 1.6495e-05 deg tp 2459979.796455069164 (2023-Feb-04.29645507) 8.0519e-05 TDB period 1719.761875647163 4.71 9.6696e-06 2.647e-08 d yr n .2093313063266556 1.177e-09 deg/d Q 3.206136892302852 1.2018e-08 au   Orbit Determination Parameters    # obs. used (total)      2870      data-arc span      31839 days (87.17 yr)      first obs. used      1933-11-18      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35435      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:55:16   Additional Information  Earth MOID = 1.46948 au   Jupiter MOID = 2.34591 au   T_jup = 3.241  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.34   n/a E2021B10   diameter diameter 52.464 km 0.268 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 16.67 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Hawkins, S.; Ditteon, R. (2008) Minor Planet Bull. 35, 1-4.] [Stephens, R.D. (2012) Posting on CALL web site. http://www.minorplanet.info/call.html] geometric albedo albedo 0.038   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   SMASSII spectral type spec_B Xc   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) 1428 Mombasa (1937 NO)          Discovered 1937-Jul-05 by Jackson, C. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1937 NO = 1933 WO = 1949 FA = 1957 YZ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-27 04:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin