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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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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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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