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100P/Hartley 1
Classification: Jupiter-family Comet          SPK-ID: 1000040
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455057.5 (2009-Aug-14.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4187071505270601 2.265e-07  
a 3.410329312126768 3.1408e-07 au
q 1.98240004348726 8.4741e-07 au
i 25.65332278421983 2.3912e-05 deg
node 37.84596497146841 3.79e-05 deg
peri 181.7070943094326 0.00017112 deg
M 342.1361828796595 9.8606e-05 deg
tp 2455171.647043373621
(2009-Dec-06.14704337)
0.00064225 TDB
period 2300.344620507417
6.30
0.00031779
8.701e-07
d
yr
n .1564982902086167 2.162e-08 deg/d
Q 4.838258580766276 4.4559e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.783381577280413E-9 2.406E-10
A2 [EST] -7.067341702565178E-11 1.302E-11
A3 [EST] -6.436140199144167E-10 2.063E-10
  Orbit Determination Parameters
   # obs. used (total)      396  
   data-arc span      11354 days (31.09 yr)  
   first obs. used      1985-06-13  
   last obs. used      2016-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      1  
   norm. resid. RMS      .65287  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:27:34  

Additional Information
 Earth MOID = .975567 au 
 Jupiter MOID = .138355 au 
 T_jup = 2.851 
[ 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 11.3   0.7 22 2 parameter fit from 172 observations, autocmod 2.9c
comet total magnitude slope K1 19.   n/a 22 autocmod 2.9c
comet nuclear magnitude M2 16.2   0.7 22 from 92 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 22 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 22 autocmod 2.9c

100P/Hartley 1          Discovered 1985-Jun-13 by Hartley, Malcolm at U. K. Schmidt Telescope Unit
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 
 1991.0   100P/1991 E1   1991 VII   1991j 
 1984.7   100P/1985 L1   1985 VII   1985f 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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