+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2650 Elinor (1931 EG) Classification: Main-belt Asteroid          SPK-ID: 2002650 [ 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 .1971177865776889 4.4641e-08   a 2.636778858409367 1.1687e-08 au q 2.117022846144867 1.1729e-07 au i 13.92030144677595 5.2533e-06 deg node 332.3436710175635 1.7513e-05 deg peri 23.6517146888595 2.116e-05 deg M 100.9189172214894 1.3522e-05 deg tp 2458562.091394649501 (2019-Mar-19.59139465) 5.7827e-05 TDB period 1563.900032535947 4.28 1.0398e-05 2.847e-08 d yr n .230193741614188 1.5305e-09 deg/d Q 3.156534870673867 1.3991e-08 au   Orbit Determination Parameters    # obs. used (total)      2151      data-arc span      32772 days (89.72 yr)      first obs. used      1931-02-25      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38882      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:07:34   Additional Information  Earth MOID = 1.11805 au   Jupiter MOID = 2.29879 au   T_jup = 3.328  [ 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 11.1   n/a MPO416736   diameter diameter 12.538 km 0.641 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 2.762 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pligge, Z.; Hall, B.; Ditteon, R. (2011) Minor Planet Bull. 38, 137-138.] [Stephens, R.D. (2011) Minor Planet Bull. 38, 23-24.] geometric albedo albedo 0.238   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2650 Elinor (1931 EG)          Discovered 1931-Mar-14 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1931 EG = 1931 DF = 1933 SX = 1937 PJ = 1950 RJ1 = 1950 RN = 1950 SO = 1950 TQ4 = 1954 NG = 1978 EF6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-19 07:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin