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JPL Small-Body Database Browser
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C/2013 A1 (Siding Spring)
Classification: Hyperbolic Comet          SPK-ID: 1003228
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457480.5 (2016-Apr-02.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000085526301256 2.8601e-06  
a -16366.48574855812 547.3 au
q 1.399764990633582 1.2332e-06 au
i 129.0329176101494 2.0974e-05 deg
node 300.9994099243701 0.00011762 deg
peri 2.449169482138664 7.3405e-05 deg
M .0002470499453610851 1.2392e-05 deg
tp 2456955.675811088666
(2014-Oct-25.17581109)
0.0001338 TDB
period n/a
n/a
n/a
n/a
d
yr
n 4.707289613947705E-7 2.3612e-08 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
AJ1 [EST] 8.332797598358188E-8 3.877E-9
AJ2 [EST] 1.857140671424592E-7 5.099E-8
ALF [EST] 68.42599143656125 6.618
DEL [EST] 17.2325492121477 8.506
DTH [EST] 7.940553933291362 1.464
ET1 [EST] 57.8449393653458 2.069
ET2 [EST] 149.0589506591809 4.181
  Orbit Determination Parameters
   # obs. used (total)      449  
   data-arc span      1291 days (3.53 yr)  
   first obs. used      2012-10-04  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   norm. resid. RMS      .30255  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2016-Apr-22 14:11:17  

Additional Information
 Earth MOID = .383565 au 
 Jupiter MOID = 3.6748 au 
 T_jup = -0.919 
[ 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   2. 105 from 467 observations, assumed slope, autocmod 2.6f
comet total magnitude slope K1 9.   n/a 105 autocmod 2.6f
comet nuclear magnitude M2 12.0   1. 105 from 2074 observations, autocmod 2.6f
comet nuclear magnitude slope K2 5.   n/a 105 autocmod 2.6f
comet nuclear phase coefficient PC 0.03   n/a 105 autocmod 2.6f

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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