+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/1995 O1 (Hale-Bopp) Classification: Comet          SPK-ID: 1000132 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2008-Sep-15.0] J971B/1 (default) [epoch=1996-Sep-22.0] J971A/1 Orbital Elements at Epoch 2454724.5 (2008-Sep-15.0) TDB Reference: JPL J971B/1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9949607008417696 1.1526e-05   a 182.0519703474959 0.42291 au q .9174143409263262 3.9278e-05 au i 89.21708989130315 0.00024682 deg node 282.9487539423989 0.00069828 deg peri 130.662020526416 0.0022003 deg M 1.67964178642615 0.0059279 deg tp 2450538.437848275592 (1997-Mar-30.93784828) 0.19071 TDB period 897204.6223184657 2456.41 3126.4 8.56 d yr n .0004012462609362447 1.3982e-06 deg/d Q 363.1865263540654 0.8437 au   Orbit Determination Parameters    # obs. used (total)      39      data-arc span      3098 days (8.48 yr)      first obs. used      2005-02-18      last obs. used      2013-08-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      norm. resid. RMS      .32601      source      ORB      producer      Davide Farnocchia      solution date      2017-Oct-04 09:43:58   Additional Information  Earth MOID = .116025 au   Jupiter MOID = .00736038 au   T_jup = 0.045   Not valid before 2005-1-1  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 4.0   0.8 J971B/1 from 32 observations, assumed slope, autocmod 2.6k comet total magnitude slope K1 8.   n/a J971B/1 autocmod 2.6k diameter diameter 60 km 20 Fernandez (2002) Earth, Moon and Planets 89:3-25   geometric albedo albedo 0.04   0.03 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1997.2   C/1995 O1        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2020-Dec-01 09:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin