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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 2456587.5 (2013-Oct-22.0) TDB
Reference: JPL 58 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000647997621514 2.379e-06  
a -2158.550296435509 7.9226 AU
q 1.398735458008349 2.5686e-06 AU
i 129.0274045575442 1.6706e-05 deg
node 300.9765309370206 3.9139e-05 deg
peri 2.442201699479515 0.00012916 deg
M -.003620146756019953 1.993e-05 deg
tp 2456955.853975722910
(2014-Oct-25.35397572)
0.00022604 JED
period n/a
n/a
n/a
n/a
d
yr
n 9.827901949246684E-6 5.4107e-08 deg/d
Q n/a n/a AU
  Orbit Determination Parameters
   # obs. used (total)      359  
   data-arc span      687 days (1.88 yr)  
   first obs. used      2012-10-04  
   last obs. used      2014-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   fit RMS      .30086  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2014-Aug-25 09:13:05  

Additional Information
 Earth MOID = .38426 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 mag 0.5 58 2 parameter fit from 182 observations, autocmod 2.6
comet total magnitude slope K1 7.   n/a 58 autocmod 2.6

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (AU) Minimum Distance (AU) Maximum Distance (AU) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2014-Oct-19 18:28 < 00:01 Mars 0.000934453717365117 0.000926027467025439 0.000942902527793168 55.9639276027492 55.9584528886072 2456950.269550600 0.190407754106147 484.486017408592 145.176257174474 -31.7321919644391 539.244220708271 T 58 CATAB v2.0c-linF95 2014-Aug-25 09:22:02 2014-Aug-25 09:22
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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