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JPL Small-Body Database Browser
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C/1917 F1 (Mellish)
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000985
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2421318.5 (1917-Mar-31.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .993058227782871 3.7766e-05  
a 27.39843681521469 0.14808 au
q .1901937074766215 9.4684e-06 au
i 32.68731667605889 0.0029288 deg
node 88.67459867129705 0.0033842 deg
peri 121.3136763048433 0.0027589 deg
M 359.9231968048763 0.00062395 deg
tp 2421329.675420974762
(1917-Apr-11.17542097)
0.00036856 TDB
period 52382.60653657028
143.42
424.68
1.163
d
yr
n .006872510243427279 5.5717e-05 deg/d
Q 54.60667992295275 0.29514 au
  Orbit Determination Parameters
   # obs. used (total)      11  
   data-arc span      38 days  
   first obs. used      1917-03-24  
   last obs. used      1917-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      6  
   norm. resid. RMS      .66659  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:29:02  

Additional Information
 Earth MOID = .061778 au 
 Jupiter MOID = 1.53416 au 
 T_jup = 0.644 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.0   0.7 2 2 parameter fit from 4 observations, autocmod 2.9c
comet total magnitude slope K1 16.   n/a 2 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1917.3   C/1917 F1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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