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

[ show orbit diagram ]
Orbital Elements at Epoch 2450465.5 (1997-Jan-17.0) TDB
Reference: JPL 221 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.9950817161180430803213 8.9166e-07  
a 185.86432848442490239904 0.033833 AU
q 0.9141335310156932791869 7.7343e-07 AU
i 89.430154349337072972048 9.3333e-06 deg
node 282.4708519554775 6.0982e-06 deg
peri 130.5894923930678 5.6168e-05 deg
M 359.9711632211816 7.8823e-06 deg
tp 2450539.637296150301
(1997-Apr-01.13729615)
3.2687e-05 JED
period 925534.2554790705
2533.97
252.72
0.6919
d
yr
n .0003889645335856949 1.0621e-07 deg/d
Q 370.8145234378341 0.067501 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.430168183270757E-8 2.787E-10
A2 [EST] 9.474703145551488E-10 4.556E-11
  Orbit Determination Parameters
   # obs. used (total)      3317  
   data-arc span      5291 days (14.49 yr)  
   first obs. used      1993-04-27  
   last obs. used      2007-10-22  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   fit RMS      .93168  
   data source      ORB  
   producer      Nick Mastrodemos  
   solution date      2007-Dec-17 14:13:26  

Additional Information
 Earth MOID = .111849 AU 
 T_jup = 0.040 
[ 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 2.3 mag 1. 221 2 parameter fit from 455 observations, autocmod 2.4a
comet total magnitude slope K1 7.   n/a 221 autocmod 2.4a
comet nuclear magnitude M2 6.1 mag 1. 221 from 525 observations, autocmod 2.4a
comet nuclear magnitude slope K2 5.   n/a 221 autocmod 2.4a
comet nuclear phase coefficient PC 0.03   n/a 221 autocmod 2.4a
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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