+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3178472833376134 7.8014e-09   a 2.758759077360079 7.6955e-09 au q 1.881894999238197 2.0549e-08 au i 13.59753335416428 3.7249e-07 deg node 255.4193710091672 1.5585e-06 deg peri 114.1605854070618 3.7494e-06 deg M 64.877790727307 2.5303e-06 deg tp 2458898.878259747625 (2020-Feb-19.37825975) 1.091e-05 TDB period 1673.667140535847 4.58 7.003e-06 1.917e-08 d yr n .2150965334031361 9.0001e-10 deg/d Q 3.63562315548196 1.0141e-08 au   Orbit Determination Parameters    # obs. used (total)      2650      data-arc span      35675 days (97.67 yr)      first obs. used      1923-07-12      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40692      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 15:25:25   Additional Information  Earth MOID = .928039 au   Jupiter MOID = 2.08537 au   T_jup = 3.228  [ 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. 2020-October); 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 ] 2021-Apr-22 15:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin