+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21022 Ike (1989 CR) Classification: Main-belt Asteroid          SPK-ID: 2021022 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2542757006472229 2.1266e-08   a 2.562649374615191 1.0547e-08 au q 1.911029909371746 5.592e-08 au i 25.01348497551222 7.2245e-07 deg node 110.7383892532883 3.8012e-06 deg peri 117.0635532735189 7.3703e-06 deg M 199.1525480353179 8.9778e-06 deg tp 2459869.989693730208 (2022-Oct-17.48969373) 4.03e-05 TDB period 1498.415341983757 4.10 9.2508e-06 2.533e-08 d yr n .2402538134209136 1.4833e-09 deg/d Q 3.214268839858636 1.3229e-08 au   Orbit Determination Parameters    # obs. used (total)      2034      data-arc span      11709 days (32.06 yr)      first obs. used      1989-02-02      last obs. used      2021-02-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40142      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:36:11   Additional Information  Earth MOID = 1.00163 au   Jupiter MOID = 2.20453 au   T_jup = 3.261  [ 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 13.3   n/a MPO531258   diameter diameter 8.111 km 0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.550 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D. (2006) Minor Planet Bull. 33, 85-88.] geometric albedo albedo 0.203   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   21022 Ike           Discovered 1989 Feb. 2 by T. Seki at Geisei. Koichi Ike (b. 1925) was born in Tosa city in Kochi prefecture. He took an interest in astronomy by reading science magazines when he was a boy in primary school. He is a long-time friend and assistant of the discoverer, who worked together with Ike in astronomical research and observation. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040107/MPCPages.arc Last Updated: 2004-01-07 [ show close-approach data ] Alternate Designations  1989 CR = 1994 NT = 1998 MQ5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-22 12:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin