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90P/Gehrels 1
Classification: Jupiter-family Comet          SPK-ID: 1000029
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2457800.5 (2017-Feb-16.0) TDB
Reference: JPL K172/12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5097929126747022 6.639e-07  
a 6.068654576868308 1.1368e-05 au
q 2.974897484109951 2.9707e-06 au
i 9.635377864966653 1.5612e-05 deg
node 13.25190332544677 0.00013869 deg
peri 29.26997752861308 0.00040184 deg
M 351.8727719107262 0.0001357 deg
tp 2457923.775565136283
(2017-Jun-19.27556514)		 0.001846 TDB
period 5460.558380000803
14.95		 0.015343
4.201e-05		 d
yr
n .06592732371811894 1.8524e-07 deg/d
Q 9.162411669626664 1.7163e-05 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.38734542294088E-7 5.044E-8
A2 [EST] 3.444369439891368E-7 5.354E-8
   Orbit Determination Parameters
   # obs. used (total)      572  
   data-arc span      6092 days (16.68 yr)  
   first obs. used      2001-08-10  
   last obs. used      2018-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      2  
   norm. resid. RMS      .56407  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2018-Apr-30 15:27:56  

Additional Information
 Earth MOID = 1.98855 au 
 Jupiter MOID = .494724 au 
 T_jup = 2.689 
[ hide covariance matrix ]
Orbit Covariance (8×8)
  e q tp node peri i A1 A2
e 4.407625974346917E-13 4.940286219656945E-13 -2.835915597225972E-10 1.030884081235969E-13 -7.671149598334051E-11 2.041118723406352E-12 -1.634267779768097E-15 3.30522782696942E-14
q 4.940286219656945E-13 8.825010885589211E-12 -3.981670384401995E-9 9.885096486613903E-13 -8.348778262977216E-10 1.377384765662618E-11 -1.330276671604909E-13 9.128511944502886E-14
tp -2.835915597225972E-10 -3.981670384401995E-9 3.407556012913405E-6 -3.410164192771669E-9 6.945618426884756E-7 -1.091287884490381E-8 4.209228229966016E-11 -4.980382526660992E-11
node 1.030884081235969E-13 9.885096486613903E-13 -3.410164192771669E-9 1.923471461538133E-8 -1.96586201439252E-8 1.180032826658471E-9 -2.329064685980136E-14 1.15645410418255E-14
peri -7.671149598334051E-11 -8.348778262977216E-10 6.945618426884756E-7 -1.96586201439252E-8 1.614782057227681E-7 -3.427011367947432E-9 9.02609475354516E-12 -1.148998158833398E-11
i 2.041118723406352E-12 1.377384765662618E-11 -1.091287884490381E-8 1.180032826658471E-9 -3.427011367947432E-9 2.437442651283499E-10 -1.332171697298483E-13 2.433582414787853E-13
A1 -1.634267779768097E-15 -1.330276671604909E-13 4.209228229966016E-11 -2.329064685980136E-14 9.02609475354516E-12 -1.332171697298483E-13 2.543898573037785E-15 -8.619717767699079E-16
A2 3.30522782696942E-14 9.128511944502886E-14 -4.980382526660992E-11 1.15645410418255E-14 -1.148998158833398E-11 2.433582414787853E-13 -8.619717767699079E-16 2.866401023860871E-15

[ 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 6.5   01. K172/12 from 212 observations, assumed slope, autocmod 2.6n
comet total magnitude slope K1 19.   n/a K172/12 autocmod 2.6n
comet nuclear magnitude M2 13.3   0.6 K172/12 from 261 observations, autocmod 2.6n
comet nuclear magnitude slope K2 5.   n/a K172/12 autocmod 2.6n
comet nuclear phase coefficient PC 0.03   n/a K172/12 autocmod 2.6n
diameter diameter 7.8 km n/a Scotti,J (1994) BAAS 26:1375  

90P/Gehrels 1          Discovered 1972-Oct-11 by Gehrels, Tom at Palomar Mountain Observatory, California
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 
 1987.6   90P/1987 Q2   1987 XVI   1987v 
 1972.6   90P/1972 T1   1973 I   1972k 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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