+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09808940620886988 3.7633e-08   a 3.169517382162357 1.7074e-08 au q 2.85862130417736 1.155e-07 au i 13.22635253546689 5.3284e-06 deg node 200.5974005532066 1.349e-05 deg peri 50.34317866947848 2.8882e-05 deg M 114.7298087547227 2.5879e-05 deg tp 2458543.656506096831 (2019-Mar-01.15650610) 0.00014652 TDB period 2061.048130139128 5.64 1.6654e-05 4.56e-08 d yr n .1746684100849691 1.4114e-09 deg/d Q 3.480413460147354 1.8748e-08 au   Orbit Determination Parameters    # obs. used (total)      1989      data-arc span      16541 days (45.29 yr)      first obs. used      1975-09-30      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46784      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:39:31   Additional Information  Earth MOID = 1.86565 au   Jupiter MOID = 1.56633 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 12.96   n/a E2021B10   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 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1954-Mar-06 01:16 00:02 Jupiter 1.95918834620348 1.95918699847762 1.95918969392989 2.97197066192794 2.82275448089354 2434807.552935471 2.01829207437609 126.597928324384 60.0800595224781 -69.006969182472 4006437.45251948 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 1964-Dec-21 10:04 00:01 Jupiter 1.66909161237995 1.66909079615767 1.66909242860451 3.75440897053346 3.61671624801805 2438750.919725954 1.38162382467148 137.299353461653 27.6623460551686 76.9121197021351 3047680.35490066 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 1975-Nov-19 08:31 < 00:01 Jupiter 1.63166411299304 1.63166361653104 1.6316646094554 4.12727765552307 3.99952364352845 2442735.854907648 0.980585470139119 116.053642969074 21.7879358028345 -85.5567652600325 2887812.71872173 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 1986-Sep-26 17:24 < 00:01 Jupiter 1.91056368060317 1.91056303615504 1.91056432505152 4.14776743677769 4.03946801121409 2446700.224704933 0.757552805388004 63.203099676269 25.5593434778453 -72.3908332984855 3206636.88527908 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 2084-May-05 08:29 00:02 Jupiter 1.86157592929496 1.86157488028955 1.8615769783009 3.07066238909861 2.91872602915277 2482350.853715342 2.03761472642614 100.916411652179 57.705883986601 73.4168173946281 2507390.34342232 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 2095-Mar-07 09:34 00:02 Jupiter 1.63459745992832 1.6345969133397 1.63459800652038 3.88360898503613 3.74780608138138 2486308.898810851 2.09998526923703 228.036839857491 21.9860530435219 85.5785881071722 2624370.0587653 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 2106-Feb-01 15:23 00:02 Jupiter 1.70334206194893 1.7033408303236 1.70334329358598 4.24167018414926 4.12276897997796 2490292.141197687 2.48346110442829 253.54394970459 22.6187590285668 -77.327997192042 2962291.76665985 T 31 CATAB v2.0f-lin.ifort 2021-Feb-24 01:39:35 2021-Feb-24 01:39 Alternate Designations  1975 SJ1 = 1981 UW26  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 11:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin