+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1429 Pemba (1937 NH) Classification: Main-belt Asteroid          SPK-ID: 2001429 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3334179957089302 3.3343e-08   a 2.556488286892072 9.2693e-09 au q 1.70410908622316 8.1792e-08 au i 7.745789496867096 4.2067e-06 deg node 47.6790257665994 2.2676e-05 deg peri 297.8760102365837 2.406e-05 deg M 136.8678004748059 1.009e-05 deg tp 2458632.873157012403 (2019-May-29.37315701) 4.0567e-05 TDB period 1493.014885653475 4.09 8.1201e-06 2.223e-08 d yr n .2411228471057288 1.3114e-09 deg/d Q 3.408867487560983 1.236e-08 au   Orbit Determination Parameters    # obs. used (total)      2625      data-arc span      30522 days (83.56 yr)      first obs. used      1937-07-02      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46442      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:55:17   Additional Information  Earth MOID = .712864 au   Jupiter MOID = 2.06634 au   T_jup = 3.345  [ 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 12.39   n/a E2021B10   diameter diameter 9.874 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 20. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Harris, A.W.; Young, J.W.; Bowell, E.; Tholen, D.J. (1999) Icarus 142, 173-201.] geometric albedo albedo 0.196   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1429 Pemba (1937 NH)          Discovered 1937-Jul-02 by Jackson, C. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1937 NH = 1949 JK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 08:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin