+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/1983 H1 (IRAS-Araki-Alcock) Classification: Comet          SPK-ID: 1000304 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2445466.5 (1983-May-12.0) TDB Reference: JPL 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9898702562860567 9.8584e-06   a 97.8642595251924 0.095246 AU q .9913398677450297 1.3926e-07 AU i 73.25259957466264 0.00010779 deg node 49.10246667885038 5.9168e-06 deg peri 192.8513738180423 8.3e-05 deg M 359.990577919114 1.3818e-05 deg tp 2445475.755053337452 (1983-May-21.25505334) 7.5221e-05 JED period 353618.1913319791 968.15 516.23 1.413 d yr n .001018047172980503 1.4862e-06 deg/d Q 194.7371791826397 0.18953 AU   Orbit Determination Parameters    # obs. used (total)      278      # delay obs. used      0      # Doppler obs. used      1      data-arc span      160 days      first obs. used      1983-04-27      last obs. used      1983-10-04      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      3      fit RMS      1.3755      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 21:14:14   Additional Information  Earth MOID = .00583133 AU   T_jup = 0.408  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes diameter diameter 9.2 km 1. Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   geometric albedo albedo 0.02   0.01 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (AU) Minimum Distance (AU) Maximum Distance (AU) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1983-May-11 12:02 < 00:01 Earth 0.0311654561477189 0.0311651035267123 0.0311658087688785 43.7575889702493 43.7556351024393 2445466.002061320 0.00168043899490792 17.814086346333 2.65562648914663 -0.443977173064831 253589.58772197 T 12 CATAB v2.0c-linF95 2011-Sep-15 11:36:04 2011-Sep-15 13:08 Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1983.4   C/1983 H1   1983 VII   1983d  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-25 17:25 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin