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

[ show orbit diagram ]
Orbital Elements at Epoch 2452749.5 (2003-Apr-20.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8350738462769237 5.3339e-08  
a 7.72123378622071 6.629e-08 AU
q 1.273433390358047 4.1229e-07 AU
i 95.69806814972893 2.316e-05 deg
node 1.415670065293847 4.2944e-05 deg
peri 47.13845022529085 3.5656e-05 deg
M 323.5772227049488 2.6451e-06 deg
tp 2453542.364618675136
(2005-Jun-20.86461868)
5.816e-05 JED
period 7836.614446252856
21.46
0.00010092
2.763e-07
d
yr
n .045938204880315 5.916e-10 deg/d
Q 14.16903418208337 1.2165e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      321  
   data-arc span      7958 days (21.79 yr)  
   first obs. used      1983-12-29  
   last obs. used      2005-10-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .93788  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-13 19:41:43  

Additional Information
 Earth MOID = .447763 AU 
 T_jup = 0.541 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 8.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 10.0   n/a ICQ 2005 Handbook  

[ 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 | Physical Parameters | Close-Approach Data ]
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