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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 2452359.5 (2002-Mar-26.0) TDB
Reference: JPL 58 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .835102709933107 5.327e-08  
a 7.715068887834067 5.7863e-08 AU
q 1.272193952283236 4.1174e-07 AU
i 95.70810333648247 2.2829e-05 deg
node 1.464989629792072 4.2747e-05 deg
peri 47.17654759678189 3.5548e-05 deg
M 305.5923815405813 2.6185e-06 deg
tp 2453542.447183964761
(2005-Jun-20.94718396)
5.7813e-05 JED
period 7827.23078652952
21.43
8.8056e-05
2.411e-07
d
yr
n .04599327780388839 5.1742e-10 deg/d
Q 14.1579438233849 1.0618e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      315  
   data-arc span      7949 days (21.76 yr)  
   first obs. used      1984-01-07  
   last obs. used      2005-10-12  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .95357  
   data source      ORB  
   producer      Otto Matic  
   solution date      2011-Sep-14 21:11:35  

Additional Information
 Earth MOID = .447117 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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