+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3617 Eicher (1984 LJ) Classification: Main-belt Asteroid          SPK-ID: 2003617 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1117294181723637 4.1529e-08   a 2.626695906736355 1.0382e-08 au q 2.333216701360973 1.0659e-07 au i 14.47684285307868 4.3667e-06 deg node 181.4823135455371 1.3439e-05 deg peri 36.11873904493304 2.121e-05 deg M 176.4912647279603 1.6803e-05 deg tp 2458238.186102505913 (2018-Apr-29.68610251) 7.1642e-05 TDB period 1554.938163771879 4.26 9.2188e-06 2.524e-08 d yr n .2315204606765409 1.3726e-09 deg/d Q 2.920175112111737 1.1542e-08 au   Orbit Determination Parameters    # obs. used (total)      2407      data-arc span      25622 days (70.15 yr)      first obs. used      1950-06-07      last obs. used      2020-07-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42527      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:05:27   Additional Information  Earth MOID = 1.34311 au   Jupiter MOID = 2.06441 au   T_jup = 3.348  [ 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 12.4   n/a MPO302084   diameter diameter 9.193 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 10.3050 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Loera-Gonzalez, P.; Olguin, L.; Saucedo, J.C.; Nunez-Lopez, R.; Yahia-Keith, N.A. (2019) Minor Planet Bull. 46, 97-98.] geometric albedo albedo 0.331   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   3617 Eicher (1984 LJ)          Discovered 1984-Jun-02 by Skiff, B. A. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1984 LJ = 1950 LM = 1971 FU  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-24 13:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin