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87P/Bus
Classification: Encke-type Comet          SPK-ID: 1000010
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | 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 2456870.5 (2014-Aug-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3890210684886514 9.6595e-07  
a 3.439988882211404 8.0274e-07 AU
q 2.101760731664442 3.3779e-06 AU
i 2.600758107323592 7.3981e-05 deg
node 181.8982979881928 0.00070259 deg
peri 24.71860995154904 0.00094233 deg
M 34.66653612875152 0.00027067 deg
tp 2456646.090140525146
(2013-Dec-19.59014053)
0.0017003 JED
period 2330.418854393253
6.38
0.00081572
2.233e-06
d
yr
n .1544786677816891 5.4072e-08 deg/d
Q 4.778217032758366 1.115e-06 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.940275121176924E-8 8.199E-10
A2 [EST] -2.347188563695528E-9 2.759E-11
A3 [EST] 1.075735009316867E-9 4.229E-10
  Orbit Determination Parameters
   # obs. used (total)      269  
   data-arc span      7792 days (21.33 yr)  
   first obs. used      1993-01-01  
   last obs. used      2014-05-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      1  
   fit RMS      .80163  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2014-Aug-12 08:18:02  

Additional Information
 Earth MOID = 1.09733 AU 
 T_jup = 3.009 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.5 mag 0.9 18 2 parameter fit from 123 observations, autocmod 2.5c
comet total magnitude slope K1 11.   n/a 18 autocmod 2.5c
comet nuclear magnitude M2 16.1 mag 0.8 18 from 134 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 18 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 18 autocmod 2.5c
diameter diameter 0.56 km n/a DASTCOM value unverified

87P/Bus          Discovered 1981-Mar-02 by Bus, Schelte J. at U. K. Schmidt Telescope Unit, Siding Spring
discovered on plate/photo taken on discovery date
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1994.8       1994 XVI   1993b 
 1988.4   87P/1987 B4   1987 XXXIV   1987f 
 1982.1   87P/1981 E1   1981 XI   1981b 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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