+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1543050963941917 1.2369e-08   a 2.630386938140646 1.0502e-08 au q 2.224504828096831 3.5833e-08 au i 15.99070375942887 8.6497e-07 deg node 109.7499379200972 3.3196e-06 deg peri 145.7163049821601 8.15e-06 deg M 266.7198291379889 1.0084e-05 deg tp 2459604.252029078782 (2022-Jan-24.75202908) 4.4707e-05 TDB period 1558.216812052995 4.27 9.3321e-06 2.555e-08 d yr n .2310333178382858 1.3836e-09 deg/d Q 3.036269048184461 1.2123e-08 au   Orbit Determination Parameters    # obs. used (total)      3277      data-arc span      16683 days (45.68 yr)      first obs. used      1975-07-11      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .37213      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:04:15   Additional Information  Earth MOID = 1.22334 au   Jupiter MOID = 2.12468 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 12.81   n/a E2021B10   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. 2020-October); 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.] [McNeill, A.; Mommert, M.; Trilling, D.E.; Llama, J.; Skiff, B. (2019) Ap. J. Suppl. Series 245, id.29.] 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 ] 2021-Apr-16 04:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin