+ 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 ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1972482549698848 1.9269e-08   a 2.636698696653493 1.1064e-08 au q 2.116614479857222 5.0639e-08 au i 13.92148432819848 1.308e-06 deg node 332.3419532156195 2.2102e-06 deg peri 23.6647660821993 7.5743e-06 deg M 146.9315404954652 6.5166e-06 deg tp 2458562.233993589983 (2019-Mar-19.73399359) 2.6135e-05 TDB period 1563.828715963799 4.28 9.8433e-06 2.695e-08 d yr n .2302042393294521 1.449e-09 deg/d Q 3.156782913449764 1.3247e-08 au   Orbit Determination Parameters    # obs. used (total)      2458      data-arc span      32899 days (90.07 yr)      first obs. used      1931-02-25      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .37445      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:24:51   Additional Information  Earth MOID = 1.11592 au   Jupiter MOID = 2.29925 au   T_jup = 3.328  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.24   n/a MPCxxxxx   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 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 ] 2021-May-08 20:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin