+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16000 Neilgehrels (1999 AW16) Classification: Main-belt Asteroid          SPK-ID: 2016000 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1674197359944437 3.6188e-08   a 2.40278633510585 7.2656e-09 au q 2.000512481231372 8.6469e-08 au i 2.187705320840426 5.1755e-06 deg node 174.8075196186271 8.1207e-05 deg peri 50.81730169697227 8.2419e-05 deg M 179.4931469070542 1.4322e-05 deg tp 2458322.208260689171 (2018-Jul-22.70826069) 5.3334e-05 TDB period 1360.414201653857 3.72 6.1705e-06 1.689e-08 d yr n .2646252880647288 1.2003e-09 deg/d Q 2.805060188980328 8.482e-09 au   Orbit Determination Parameters    # obs. used (total)      1506      data-arc span      10148 days (27.78 yr)      first obs. used      1992-03-25      last obs. used      2020-01-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51129      source      ORB      producer      Otto Matic      solution date      2020-Jan-29 00:00:13   Additional Information  Earth MOID = .992123 au   Jupiter MOID = 2.17566 au   T_jup = 3.504  [ 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 14.7   n/a MPO449067   diameter diameter 2.729 km 0.510 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.343   0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   16000 Neilgehrels           Discovered 1999 Jan. 10 by Spacewatch at Kitt Peak. Neil Gehrels (1952) is an astrophysicist who has worked to develop gamma-ray astronomy into a full astronomical discipline. He is the Principal Investigator for the Swift Gamma-Ray Burst Mission (launched Nov. 2004) and was Project Scientist for the Compton Gamma Ray Observatory (1991-2000). NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2015-03-05 Last Updated: 2015-03-09 Alternate Designations  1999 AW16 = 1992 GL1 = 1993 RK17  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-23 22:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin