+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1516 Henry (1938 BG) Classification: Main-belt Asteroid          SPK-ID: 2001516 [ 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 .1860256436741623 3.9661e-08   a 2.621969949513679 7.0521e-09 au q 2.134216301961086 1.0291e-07 au i 8.749262666016909 3.1683e-06 deg node 125.8187250846379 2.7237e-05 deg peri 94.37841407001396 2.8309e-05 deg M 89.06128885424988 8.539e-06 deg tp 2458616.857717016108 (2019-May-13.35771702) 3.6502e-05 TDB period 1550.743579516597 4.25 6.2563e-06 1.713e-08 d yr n .232146697078198 9.3657e-10 deg/d Q 3.109723597066272 8.3639e-09 au   Orbit Determination Parameters    # obs. used (total)      2751      data-arc span      30241 days (82.80 yr)      first obs. used      1938-01-28      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43894      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:06   Additional Information  Earth MOID = 1.14788 au   Jupiter MOID = 1.9343 au   T_jup = 3.363  [ 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 12.0   n/a MPO492768   diameter diameter 26.442 km 0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 17.599 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Polakis, T. (2019) Minor Planet Bull. 46, 400-406.] geometric albedo albedo 0.039   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   1516 Henry (1938 BG)          Discovered 1938-Jan-28 by Patry, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1938 BG = 1938 DM  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-19 19:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin