+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3682 Welther (A923 NB) Classification: Main-belt Asteroid          SPK-ID: 2003682 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3177142777796305 3.4496e-08   a 2.758100968699761 9.7252e-09 au q 1.881812911386017 9.3516e-08 au i 13.59872567376173 4.7274e-06 deg node 255.4203002867674 1.7284e-05 deg peri 114.1375331271583 1.8795e-05 deg M 21.87965359284474 8.6745e-06 deg tp 2458898.816237146214 (2020-Feb-19.31623715) 3.9962e-05 TDB period 1673.068290228064 4.58 8.849e-06 2.423e-08 d yr n .2151735240591564 1.1381e-09 deg/d Q 3.634389026013505 1.2815e-08 au   Orbit Determination Parameters    # obs. used (total)      2283      data-arc span      35541 days (97.31 yr)      first obs. used      1923-07-12      last obs. used      2020-10-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43188      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:58:12   Additional Information  Earth MOID = .929229 au   Jupiter MOID = 2.08545 au   T_jup = 3.229  [ 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 11.8   n/a MPO502188   diameter diameter 19.087 km 0.229 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.5973 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D.; Warner, B.D.; Pravec, P.; Kusnirak, P.; et al. (2002) Minor Planet Bull. 29, 41-46.] [Szekely, P.; Kiss, L.L.; Szabo, Gy.M.; Sarneczky, K.; et al. (2005) Planet. Space Sci. 53, 925-936.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Klinglesmith III, D.A.; Hendrickx, S.; Madden, K.; Montgomery, S. (2016) Minor Planet Bull. 43, 123-128.] [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.138   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   3682 Welther (A923 NB)          Discovered 1923-Jul-12 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A923 NB = 1951 YO = 1978 NP3 = 1984 AA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-28 15:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin