+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   150158 (1997 HG2) Classification: Main-belt Asteroid          SPK-ID: 2150158 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09540197157312799 3.9325e-08   a 3.106944600444335 2.559e-08 au q 2.810535959993461 1.2311e-07 au i 9.166336152321719 4.3546e-06 deg node 204.2241708526666 2.7741e-05 deg peri 268.7123998656877 3.9033e-05 deg M 221.2136484929496 3.1174e-05 deg tp 2459971.657255870861 (2023-Jan-27.15725587) 0.00017765 TDB period 2000.316379088667 5.48 2.4713e-05 6.766e-08 d yr n .1799715303856153 2.2234e-09 deg/d Q 3.403353240895209 2.8031e-08 au   Orbit Determination Parameters    # obs. used (total)      497      data-arc span      8602 days (23.55 yr)      first obs. used      1997-04-29      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58793      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 23:09:45   Additional Information  Earth MOID = 1.84618 au   Jupiter MOID = 1.77751 au   T_jup = 3.194  [ 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 15.32   n/a E2021B55   diameter diameter 3.927 km 1.270 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.087   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   150158 (1997 HG2)          Discovered 1997-Apr-29 by Spacewatch at Kitt Peak Reference: 20070303/Numbers.arc Last Updated: 2007-03-07 [ show close-approach data ] Alternate Designations  1997 HG2 = 2002 GY102  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 08:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin