+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   48164 (2001 HJ9) Classification: Main-belt Asteroid          SPK-ID: 2048164 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1712115966114839 4.2372e-08   a 3.065805843049553 2.1666e-08 au q 2.540904329760223 1.3109e-07 au i 13.76072529734576 5.4205e-06 deg node 52.0768350744694 2.0086e-05 deg peri 278.7801684147433 2.507e-05 deg M 115.767211730295 1.5491e-05 deg tp 2458369.980574944802 (2018-Sep-08.48057494) 8.334e-05 TDB period 1960.719184881873 5.37 2.0784e-05 5.69e-08 d yr n .1836060986069705 1.9463e-09 deg/d Q 3.590707356338884 2.5375e-08 au   Orbit Determination Parameters    # obs. used (total)      1039      data-arc span      10192 days (27.90 yr)      first obs. used      1992-11-24      last obs. used      2020-10-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53019      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 23:38:39   Additional Information  Earth MOID = 1.57674 au   Jupiter MOID = 1.98373 au   T_jup = 3.166  [ hide covariance matrix ] Orbital Elements at Epoch 2456872.5 (2014-Aug-03.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1739384442334019 4.2771e-08   q 2.529729659950501 1.3236e-07 au tp 2456399.457603259278 (2013-Apr-16.95760326) 7.9729e-05 TDB node 52.48453660388054 2.0193e-05 deg peri 276.7696208225735 2.4811e-05 deg i 13.73218082677654 5.4082e-06 deg   Orbit Determination Parameters    # obs. used (total)      1039      data-arc span      10192 days (27.90 yr)      first obs. used      1992-11-24      last obs. used      2020-10-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53019      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 23:38:39   Additional Information  Jupiter MOID = 1.98373 au   T_jup = 3.166  Orbit Covariance (6×6)   e q tp node peri i e 1.829393411259445E-15 -5.610604753463671E-15 6.094591283585049E-13 -1.580396491093819E-15 1.158899312599284E-13 -3.331625429135816E-15 q -5.610604753463671E-15 1.751844177380499E-14 -1.977512759089692E-12 5.461771802146296E-15 -3.619393089071457E-13 1.259351911716244E-14 tp 6.094591283585049E-13 -1.977512759089692E-12 6.356684007178414E-9 2.517621313691957E-12 1.177323678579631E-9 7.565595164438059E-13 node -1.580396491093819E-15 5.461771802146296E-15 2.517621313691957E-12 4.077379544179687E-10 -3.952249454310718E-10 -1.93238673476944E-11 peri 1.158899312599284E-13 -3.619393089071457E-13 1.177323678579631E-9 -3.952249454310718E-10 6.155790217326063E-10 1.868407145603039E-11 i -3.331625429135816E-15 1.259351911716244E-14 7.565595164438059E-13 -1.93238673476944E-11 1.868407145603039E-11 2.924874071789666E-11 [ 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 14.0   n/a MPO459182   diameter diameter 8.566 km 0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 86.0116 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.055   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   48164 (2001 HJ9)          Discovered 2001-Apr-16 by LINEAR at Socorro Reference: 20020921/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  2001 HJ9 = 1999 BM18  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 14:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin