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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


:
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 
[ 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 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)		 Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1986-Oct-07 03:46 07:24 Jupiter 1.56435203899062 1.56321812235977 1.56548773546019 5.91017586423802 5.81784096542182 2446710.656673945 444.129422527843 101181.29255086 526.075785272222 -57.3800852334514 198492.207833271 T K172/12 CATAB v2.0e-lin.ifort 2018-Apr-30 15:32:03 2018-Apr-30 15:32
2047-Mar-13 21:52 15:49 Jupiter 1.94150444156397 1.94027260578967 1.94273659220818 7.68591407876758 7.62894047568933 2468783.411226438 949.176674459554 72840.6457145924 357.758037900115 -33.792926441255 254133.760509554 T K172/12 CATAB v2.0e-lin.ifort 2018-Apr-30 15:32:03 2018-Apr-30 15:32
2108-Jan-29 20:10 3_02:50 Jupiter 1.99936534276594 1.99426509591511 2.00447081700037 6.69733333286253 6.63377587696923 2491019.339960196 4489.75199065461 301897.763865723 606.441628667601 37.5310103062704 42166.6230473432 T K172/12 CATAB v2.0e-lin.ifort 2018-Apr-30 15:32:03 2018-Apr-30 15:32

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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