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87P/Bus
Classification: Encke-type Comet          SPK-ID: 1000010
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2457467.5 (2016-Mar-20.0) TDB
Reference: JPL K203/18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3893476920698341 5.0921e-07  
a 3.440869358876915 2.8337e-07 au
q 2.101174815284378 1.7475e-06 au
i 2.6023944932398 2.6702e-05 deg
node 181.8898060895848 0.00031244 deg
peri 24.75638615410691 0.00066668 deg
M 126.7935222833317 0.00024799 deg
tp 2456646.401481615152
(2013-Dec-19.90148162)
0.0016097 TDB
period 2331.313629398277
6.38
0.00028799
7.885e-07
d
yr
n .1544193777535276 1.9076e-08 deg/d
Q 4.780563902469451 3.9371e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.255996545216359E-8 1.286E-9
A2 [EST] -2.017205026726924E-9 4.033E-11
A3 [EST] 5.855153256434009E-9 2.393E-10
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      7602 days (20.81 yr)  
   first obs. used      1999-11-13  
   last obs. used      2020-09-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .70867  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Sep-28 09:20:31  

Additional Information
 Earth MOID = 1.0978 au 
 Jupiter MOID = .180999 au 
 T_jup = 3.009 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 12.7   0.7 K203/18 2 parameter fit from 461 observations, autocmod 2.9a
comet total magnitude slope K1 14.   n/a K203/18 autocmod 2.9a
comet nuclear magnitude M2 16.1   0.7 K203/18 from 165 observations, autocmod 2.9a
comet nuclear magnitude slope K2 5.   n/a K203/18 autocmod 2.9a
comet nuclear phase coefficient PC 0.03   n/a K203/18 autocmod 2.9a
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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