+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   15967 Clairearmstrong (1998 DN20) Classification: Main-belt Asteroid          SPK-ID: 2015967 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2862680040513838 8.2898e-08   a 2.63947021136103 3.503e-08 AU q 1.883874342201624 2.1871e-07 AU i 12.22034174711683 8.4402e-06 deg node 123.5383041376691 3.615e-05 deg peri 273.4346384895684 3.9591e-05 deg M 301.9494255534779 1.6845e-05 deg tp 2456653.067575502512 (2013-Dec-26.56757550) 7.5042e-05 JED period 1566.295046135441 4.29 3.1181e-05 8.537e-08 d yr n .229841753562483 4.5756e-09 deg/d Q 3.395066080520436 4.5058e-08 AU   Orbit Determination Parameters    # obs. used (total)      883      data-arc span      11228 days (30.74 yr)      first obs. used      1982-07-21      last obs. used      2013-04-17      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .52194      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:01:20   Additional Information  Earth MOID = .936834 AU   T_jup = 3.305  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.50 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 diameter diameter 12.16 km 0.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 rotation period rot_per 5.897 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Brinsfield, J.W. (2010) Minor Planet Bul. 37, 50-53.] [Warner, B.D. (2010) Minor Planet Bul. 37, 112-118.] geometric albedo albedo 0.1194   0.021 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 15967 Clairearmstrong           Discovered 1998 Feb. 24 by M. Armstrong at Rolvenden. Claire Armstrong, the wife of supernova discoverer Mark Armstrong, has provided unwavering support throughout the years of Mark's patrol. A large degree of Mark's success is due to Claire's support, which extends to practical help also: she co-discovered minor planet 1997 WQ28 with him. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010109/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1998 DN20 = 1989 CG7 = 1999 JB84  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-19 17:08 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin