+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   27291 Greghansen (2000 AV129) Classification: Main-belt Asteroid          SPK-ID: 2027291 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1607437965246318 3.6426e-08   a 2.218210238504524 8.4516e-09 au q 1.861646703277498 8.4297e-08 au i 4.880850436047211 3.6237e-06 deg node 255.0684734874731 4.7055e-05 deg peri 8.67652816445954 4.8783e-05 deg M 299.8999520152315 1.4648e-05 deg tp 2459201.953493515417 (2020-Dec-18.45349352) 4.9532e-05 TDB period 1206.708814673993 3.30 6.8965e-06 1.888e-08 d yr n .298332120907941 1.705e-09 deg/d Q 2.57477377373155 9.8101e-09 au   Orbit Determination Parameters    # obs. used (total)      1022      data-arc span      10507 days (28.77 yr)      first obs. used      1991-07-16      last obs. used      2020-04-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50421      source      ORB      producer      Otto Matic      solution date      2020-May-20 06:09:55   Additional Information  Earth MOID = .846157 au   Jupiter MOID = 2.49544 au   T_jup = 3.630  [ 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 15.6   n/a MPO468049   diameter diameter 2.000 km 0.405 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.335   0.260 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   27291 Greghansen           Discovered 2000 Jan. 5 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Gregory A. Hansen mentored a finalist in the 2011 Intel Science Talent Search, a science competition for high-school seniors. He teaches at the Lawrenceville School, Lawrenceville, New Jersey, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20110319/MPCPages.arc Last Updated: 2011-03-23 [ show close-approach data ] Alternate Designations  2000 AV129 = 1991 OS = 1998 SB132  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-21 22:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin