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C/1995 O1 (Hale-Bopp)
Classification: Comet          SPK-ID: 1000132
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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:
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 ]
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