+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   162082 (1998 HL1) Classification: Apollo [NEO, PHA]          SPK-ID: 2162082 [ 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 151 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1870614499151168 8.8479e-09   a 1.246321031381239 2.1713e-09 au q 1.01318241219136 1.0157e-08 au i 20.05175704878562 4.1154e-06 deg node 213.5418858713961 9.0189e-07 deg peri 148.6394440428364 6.4675e-06 deg M 316.4912833996217 3.6753e-06 deg tp 2459261.921028508688 (2021-Feb-16.42102851) 5.1546e-06 TDB period 508.2101241050004 1.39 1.3281e-06 3.636e-09 d yr n .7083684148047807 1.8511e-09 deg/d Q 1.479459650571117 2.5775e-09 au   Orbit Determination Parameters    # obs. used (total)      1334      # delay obs. used      3      # Doppler obs. used      1      data-arc span      7977 days (21.84 yr)      first obs. used      1998-04-18      last obs. used      2020-02-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .37135      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 20:08:20   Additional Information  Earth MOID = .0410542 au   Jupiter MOID = 3.9269 au   T_jup = 5.078  [ 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 19.13   n/a E2021B55   rotation period rot_per 11.7864 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm] [Franco, L.; Marchini, A.; Scarfi, G.; Bacci, P.; et al. (2020) Minor Planet Bull. 47, 144-147.] [Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 105-120.] 162082 (1998 HL1)          Discovered 1998-Apr-18 by LINEAR at Socorro Reference: 20070926/Numbers.arc Last Updated: 2007-09-30 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-22 10:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin