+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7807 Grier (1975 SJ1) Classification: Main-belt Asteroid          SPK-ID: 2007807 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09822029027375945 4.1762e-08   a 3.170089748628269 2.1014e-08 au q 2.858722613324131 1.3426e-07 au i 13.22532032501107 5.5948e-06 deg node 200.5993660945983 1.7693e-05 deg peri 50.45610789056646 3.0992e-05 deg M 79.665445459221 2.5851e-05 deg tp 2458544.281122527822 (2019-Mar-01.78112253) 0.00014676 TDB period 2061.606446097818 5.64 2.0499e-05 5.612e-08 d yr n .1746211070892814 1.7363e-09 deg/d Q 3.481456883932407 2.3078e-08 au   Orbit Determination Parameters    # obs. used (total)      1489      data-arc span      16086 days (44.04 yr)      first obs. used      1975-09-30      last obs. used      2019-10-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51155      source      ORB      producer      Otto Matic      solution date      2019-Nov-07 03:05:10   Additional Information  Earth MOID = 1.86722 au   Jupiter MOID = 1.56694 au   T_jup = 3.154  [ 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 12.9   n/a MPO347588   7807 Grier           Discovered 1975 Sept. 30 by S. J. Bus at Palomar. Jennifer Grier (b. 1968) is involved in numerous aspects of planetary science education and research. Her research has focused on planetary surface ages via crater counting and radiometric dating. In 2006 she became the Education Officer for the AAS Division of Planetary Sciences. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070402/MPCPages.arc Last Updated: 2007-07-05 [ show close-approach data ] Alternate Designations  1975 SJ1 = 1981 UW26  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-06 08:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin