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C/2015 A1 (PANSTARRS)
Classification: Halley-type Comet*          SPK-ID: 1003367
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457110.5 (2015-Mar-29.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9008144851681094 9.3593e-06  
a 20.11891422556591 0.0019243 au
q 1.995504865321403 3.5106e-06 au
i 80.36574604899475 5.1316e-05 deg
node 341.0859682683059 7.1034e-05 deg
peri 244.8792987589252 0.00026006 deg
M .1741277630586031 2.4217e-05 deg
tp 2457094.556973954384
(2015-Mar-13.05697395)
0.00061806 TDB
period 32961.36856987085
90.24
4.729
0.01295
d
yr
n .01092187659735303 1.567e-06 deg/d
Q 38.2423235858104 0.0036578 au
  Orbit Determination Parameters
   # obs. used (total)      60  
   data-arc span      279 days  
   first obs. used      2015-01-08  
   last obs. used      2015-10-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .40569  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:05  

Additional Information
 Earth MOID = 1.40169 au 
 Jupiter MOID = .576811 au 
 T_jup = 0.544 
[ 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 7.3   0.4 18 from 25 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 32.5   n/a 18 autocmod 2.9c
comet nuclear magnitude M2 17.0   0.6 18 from 30 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 18 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 18 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2015.2   C/2015 A1       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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