+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15621 Erikhovland (2000 HO20) Classification: Main-belt Asteroid          SPK-ID: 2015621 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1543891456397549 3.7281e-08   a 2.630498487540552 1.1873e-08 au q 2.224378073442498 9.8878e-08 au i 15.99112050014301 3.8703e-06 deg node 109.7505116720978 1.6571e-05 deg peri 145.6793688938349 2.1775e-05 deg M 220.5666676555444 1.615e-05 deg tp 2459604.058843254403 (2022-Jan-24.55884325) 7.1538e-05 TDB period 1558.315934347852 4.27 1.055e-05 2.888e-08 d yr n .2310186221323973 1.5641e-09 deg/d Q 3.036618901638605 1.3706e-08 au   Orbit Determination Parameters    # obs. used (total)      2957      data-arc span      16360 days (44.79 yr)      first obs. used      1975-07-11      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38032      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:13:14   Additional Information  Earth MOID = 1.22498 au   Jupiter MOID = 2.12522 au   T_jup = 3.329  [ 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 12.8   n/a MPO502289   diameter diameter 10.321 km 1.561 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 5.3426 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Casalnuovo, G.B. (2013) Minor Planet Bull. 40, 204-205.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.151   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   15621 Erikhovland           Discovered 2000 Apr. 29 by JPL/MSSS NEAT at Haleakala. Erik Hovland (b. 1970) is a computer programmer at the Jet Propulsion Laboratory. He developed the NEAT operations software when it changed telescopes to the MSSS 1.2-m on Maui and has helped deploy the first phase of the Keck Interferometer. His little free time is spent with his son and wife. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010509/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  2000 HO20 = 1975 NX = 1979 MJ9 = 1983 HZ1 = 1992 OG1 = 1998 XL93  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-23 22:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin