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151P/Helin
Classification: Jupiter-family Comet          SPK-ID: 1000115
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455225.5 (2010-Jan-29.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5707454240855666 1.5757e-06  
a 5.807941838469509 1.5676e-06 au
q 2.493085610807924 9.5062e-06 au
i 4.73497202072889 4.9549e-05 deg
node 143.5574035298307 0.0004025 deg
peri 215.5180433913689 0.0012497 deg
M 213.7617554378156 0.00021111 deg
tp 2457302.278978845222
(2015-Oct-06.77897885)
0.0038237 TDB
period 5112.482269071298
14.00
0.0020699
5.667e-06
d
yr
n .0704158921347996 2.8509e-08 deg/d
Q 9.122798066131095 2.4623e-06 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.480785304011472E-8 4.49E-8
A2 [EST] -3.904921622402226E-10 1.824E-10
  Orbit Determination Parameters
   # obs. used (total)      412  
   data-arc span      10382 days (28.42 yr)  
   first obs. used      1987-08-24  
   last obs. used      2016-01-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      1  
   norm. resid. RMS      .55361  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:27:40  

Additional Information
 Earth MOID = 1.49229 au 
 Jupiter MOID = .234537 au 
 T_jup = 2.625 
[ 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 8.5   0.8 34 2 parameter fit from 196 observations, autocmod 2.9c
comet total magnitude slope K1 21.75   n/a 34 autocmod 2.9c
comet nuclear magnitude M2 14.9   0.5 34 from 141 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 34 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 34 autocmod 2.9c
diameter diameter 8.4 km n/a Scotti,J (1994) BAAS 26:1375  

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2001.8   151P/2001 M1       
 1987.8   151P/1987 Q3   1987 XVII   1987w 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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