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161P/Hartley-IRAS
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000042
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2453190.5 (2004-Jul-04.0) TDB
Reference: JPL 60 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8350880971909477 5.3611e-08  
a 7.730366119265318 8.797e-08 au
q 1.274829386138673 4.1323e-07 au
i 95.69805019936666 2.3761e-05 deg
node 1.398165371226708 4.3147e-05 deg
peri 47.09145237546669 3.6063e-05 deg
M 343.8652517154134 2.6896e-06 deg
tp 2453542.350534576275
(2005-Jun-20.85053458)
5.904e-05 TDB
period 7850.52175672687
21.49
0.00013401
3.669e-07
d
yr
n .04585682469977579 7.8276e-10 deg/d
Q 14.18590285239196 1.6143e-07 au
  Orbit Determination Parameters
   # obs. used (total)      335  
   data-arc span      7994 days (21.89 yr)  
   first obs. used      1983-11-23  
   last obs. used      2005-10-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .8739  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:27:43  

Additional Information
 Earth MOID = .448405 au 
 Jupiter MOID = .114876 au 
 T_jup = 0.540 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 2.874168916578947E-15 -2.214047040620775E-14 1.075076431693314E-12 -5.798091722607883E-13 3.183520745529608E-13 2.560537618601632E-13
q -2.214047040620775E-14 1.707621505374562E-13 -8.211828170106171E-12 4.389841444016828E-12 -2.466755228106999E-12 -1.923047636313907E-12
tp 1.075076431693314E-12 -8.211828170106171E-12 3.485775230493639E-9 -5.179505004922274E-10 1.83855598591776E-9 2.282968859323173E-10
node -5.798091722607883E-13 4.389841444016828E-12 -5.179505004922274E-10 1.861692549346386E-9 -6.69260868618962E-11 -2.904651480314467E-10
peri 3.183520745529608E-13 -2.466755228106999E-12 1.83855598591776E-9 -6.69260868618962E-11 1.300551444590048E-9 2.512932233418087E-11
i 2.560537618601632E-13 -1.923047636313907E-12 2.282968859323173E-10 -2.904651480314467E-10 2.512932233418087E-11 5.646002754917704E-10

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.5   2. 60 2 parameter fit from 30 observations, autocmod 2.9c
comet total magnitude slope K1 11.5   n/a 60 autocmod 2.9c
comet nuclear magnitude M2 15.0   0.6 60 from 184 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 60 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 60 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2005.5   161P/2004 V2       
 1984.0   161P/1983 V1   1984 III   1983v 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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