+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21708 Mulhall (1999 RV90) Classification: Main-belt Asteroid          SPK-ID: 2021708 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05781400146668061 3.643e-08   a 2.619224013087962 1.134e-08 au q 2.46779619215373 9.6562e-08 au i 6.304384144980493 3.8531e-06 deg node 142.3579192528619 3.1355e-05 deg peri 193.778933889479 4.4104e-05 deg M 24.70929196699118 2.9813e-05 deg tp 2459094.228895888086 (2020-Sep-01.72889589) 0.00012836 TDB period 1548.308123575405 4.24 1.0055e-05 2.753e-08 d yr n .2325118589242275 1.51e-09 deg/d Q 2.770651834022195 1.1996e-08 au   Orbit Determination Parameters    # obs. used (total)      1254      data-arc span      8747 days (23.95 yr)      first obs. used      1997-01-31      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53646      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:54:05   Additional Information  Earth MOID = 1.4561 au   Jupiter MOID = 2.45177 au   T_jup = 3.395  [ 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 14.92   n/a E2021B10   diameter diameter 5.015 km 0.206 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.102   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21708 Mulhall           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Michael Mulhall (b. 1987) was awarded first place in the 2005 Intel International Science and Engineering Fair for his physics team project. He attends the Synge Street CBS Secondary School, Dublin, Ireland. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050822/MPCPages.arc Last Updated: 2005-08-26 Alternate Designations  1999 RV90 = 1998 KS59  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 12:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin