+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1115100809748186 3.3466e-08   a 2.627254203559387 9.2537e-09 au q 2.334288874579047 8.7847e-08 au i 14.47568082403555 3.4672e-06 deg node 181.4768296263053 1.3117e-05 deg peri 36.08674079012108 1.9637e-05 deg M 222.8261122005121 1.63e-05 deg tp 2459793.180334204784 (2022-Aug-01.68033420) 7.1834e-05 TDB period 1555.433936709627 4.26 8.2178e-06 2.25e-08 d yr n .2314466667491812 1.2228e-09 deg/d Q 2.920219532539727 1.0286e-08 au   Orbit Determination Parameters    # obs. used (total)      2850      data-arc span      25793 days (70.62 yr)      first obs. used      1950-06-07      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39977      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:11:59   Additional Information  Earth MOID = 1.34329 au   Jupiter MOID = 2.06314 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 12.47   n/a E2021B10   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. 2020-October); 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 ] 2021-Mar-03 03:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin