+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22156 Richoffman (2000 WQ94) Classification: Main-belt Asteroid          SPK-ID: 2022156 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1927025038398303 3.6888e-08   a 2.303244000504957 7.6816e-09 au q 1.859403114653584 8.7016e-08 au i 2.62521154723143 3.6468e-06 deg node 276.5913047665616 8.5214e-05 deg peri 95.17859772551272 8.5818e-05 deg M 309.5218836727299 1.1277e-05 deg tp 2459379.523065344197 (2021-Jun-14.02306534) 4.0412e-05 TDB period 1276.757300253961 3.50 6.3872e-06 1.749e-08 d yr n .2819643168896643 1.4106e-09 deg/d Q 2.747084886356329 9.1619e-09 au   Orbit Determination Parameters    # obs. used (total)      1808      data-arc span      12316 days (33.72 yr)      first obs. used      1986-11-29      last obs. used      2020-08-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .52028      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:01:41   Additional Information  Earth MOID = .860255 au   Jupiter MOID = 2.72987 au   T_jup = 3.563  [ 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 14.78   n/a E2021B10   diameter diameter 6.351 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22156 Richoffman           Discovered 2000 Nov. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Richard Hoffman mentored a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition. He teaches at the Kastner Intermediate School, Fresno, California. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20051019/MPCPages.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  2000 WQ94 = 1986 WQ1 = 1999 LT34  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 06:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin