+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2721171402761525 3.1821e-08   a 2.328126971518944 7.4433e-09 au q 1.694603717829429 7.3167e-08 au i 10.77522842449452 3.6134e-06 deg node 139.1097083724068 1.5635e-05 deg peri 181.3573605464519 1.6944e-05 deg M 176.408737555405 6.1655e-06 deg tp 2458564.691965849904 (2019-Mar-22.19196585) 2.0715e-05 TDB period 1297.503147893376 3.55 6.2224e-06 1.704e-08 d yr n .2774559742567834 1.3306e-09 deg/d Q 2.961650225208459 9.4687e-09 au   Orbit Determination Parameters    # obs. used (total)      1225      data-arc span      8720 days (23.87 yr)      first obs. used      1997-04-30      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51733      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 13:41:41   Additional Information  Earth MOID = .679818 au   Jupiter MOID = 2.37344 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 15.29   n/a E2021B10   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 ] 2021-Apr-14 15:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin