+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   79400 (1997 HQ2) Classification: Main-belt Asteroid          SPK-ID: 2079400 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2720804260746542 3.2687e-08   a 2.328059423667986 7.496e-09 au q 1.694640023749286 7.5045e-08 au i 10.77455876269901 3.6267e-06 deg node 139.1111756943722 1.6442e-05 deg peri 181.3323247248373 1.8007e-05 deg M 120.9567419447432 6.3043e-06 deg tp 2458564.569657603620 (2019-Mar-22.06965760) 2.1853e-05 TDB period 1297.446680023753 3.55 6.2664e-06 1.716e-08 d yr n .2774680497802109 1.3401e-09 deg/d Q 2.961478823586686 9.5356e-09 au   Orbit Determination Parameters    # obs. used (total)      1148      data-arc span      8574 days (23.47 yr)      first obs. used      1997-04-30      last obs. used      2020-10-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5234      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:23:24   Additional Information  Earth MOID = .681823 au   Jupiter MOID = 2.37346 au   T_jup = 3.500  [ 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 15.3   n/a MPO502634   diameter diameter 2.382 km 0.559 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   geometric albedo albedo 0.248   0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   79400 (1997 HQ2)          Discovered 1997-Apr-30 by Spacewatch at Kitt Peak Reference: 20040504/Numbers.arc Last Updated: 2004-07-16 [ show close-approach data ] Alternate Designations  1997 HQ2 = 2001 QK31  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-25 09:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin