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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 
[ show covariance matrix ]

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

[ hide close-approach data ]
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
1921-Aug-29 02:18 00:02 Jupiter 0.375755922839582 0.375744274499354 0.375767571181753 19.1853646681445 19.0675077551867 2422930.595572255 1.948736678005 583.71722712832 406.069923837374 7.63712122296049 99929.806233676 T 60 CATAB v2.0g-lin.ifort 2021-Apr-15 23:27:45 2021-Apr-15 23:27
2028-Jun-02 21:47 00:01 Jupiter 0.395991471991717 0.395981187282421 0.396001756705154 19.1188052575936 19.006597035752 2461925.407298323 1.3524540272091 523.248661191632 408.150847789025 18.2989972659216 120780.444479938 T 60 CATAB v2.0g-lin.ifort 2021-Apr-15 23:27:45 2021-Apr-15 23:27
2169-Sep-17 09:10 00:31 Earth 0.416762358940565 0.416488700511844 0.417036566961277 49.9418285124635 49.941700497721 2513530.881809337 31.0599560189788 27498.6836639601 90.379086795682 -60.215399585418 601213.803539637 T 60 CATAB v2.0g-lin.ifort 2021-Apr-15 23:27:45 2021-Apr-15 23:27
2171-Feb-03 23:33 00:39 Jupiter 0.66808174823975 0.667867729151537 0.668295768453383 21.1268664949431 21.0667701051662 2514035.481536398 38.7898004745923 10759.8483938816 313.790442671265 7.49378443448391 39338.2473779715 T 60 CATAB v2.0g-lin.ifort 2021-Apr-15 23:27:45 2021-Apr-15 23:27
2190-Sep-14 15:30 00:23 Earth 0.465271373030797 0.465022827707251 0.465520133591042 50.4882378635068 50.4881244365451 2521198.145549623 23.1973316031157 20069.3471551813 102.142787655887 -51.8435851782104 537588.213211 T 60 CATAB v2.0g-lin.ifort 2021-Apr-15 23:27:45 2021-Apr-15 23:27

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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