+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3936 Elst (2321 T-3) Classification: Main-belt Asteroid          SPK-ID: 2003936 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1288064434036829 3.5955e-08   a 2.428216517954566 9.4396e-09 au q 2.115446584462763 8.7297e-08 au i 5.647128544988372 4.3222e-06 deg node 240.7296235400591 3.2928e-05 deg peri 38.58069174553165 3.6038e-05 deg M 182.9986459831454 1.6004e-05 deg tp 2459680.022166562162 (2022-Apr-10.52216656) 6.2918e-05 TDB period 1382.068410273766 3.78 8.0591e-06 2.206e-08 d yr n .2604791465631499 1.5189e-09 deg/d Q 2.740986451446369 1.0656e-08 au   Orbit Determination Parameters    # obs. used (total)      2327      data-arc span      17739 days (48.57 yr)      first obs. used      1972-04-12      last obs. used      2020-11-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45182      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:14:54   Additional Information  Earth MOID = 1.10253 au   Jupiter MOID = 2.36892 au   T_jup = 3.491  [ 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 13.0   n/a MPO350832   diameter diameter 4.677 km 0.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.6322 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.507   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3936 Elst (2321 T-3)          Discovered 1977-Oct-16 by van Houten, C. J. at Palomar Discovered in the course of the Third Trojan Survey by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  2321 T-3 = 1972 GY = 1973 TC = 1976 JG1 = 1980 MB = 1981 WA2 = 1984 MT = 1985 WS  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-18 18:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin