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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 2456572.5 (2013-Oct-07.0) TDB
Reference: JPL 67 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000637623065637 2.5719e-06  
a -2193.737676889376 8.8459 AU
q 1.398777742741776 3.0653e-06 AU
i 129.0273669898213 1.9686e-05 deg
node 300.9764182464359 4.6868e-05 deg
peri 2.441466623134332 0.00014588 deg
M -.003677329185539376 2.2241e-05 deg
tp 2456955.858834490513
(2014-Oct-25.35883449)
0.00026759 JED
period n/a
n/a
n/a
n/a
d
yr
n 9.592394526205654E-6 5.802e-08 deg/d
Q n/a n/a AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.E-8 3.372E-9
  Orbit Determination Parameters
   # obs. used (total)      367  
   data-arc span      694 days (1.90 yr)  
   first obs. used      2012-10-04  
   last obs. used      2014-08-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   fit RMS      .29089  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2014-Sep-12 14:22:45  

Additional Information
 Earth MOID = .382601 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 67 2 parameter fit from 182 observations, autocmod 2.6
comet total magnitude slope K1 7.   n/a 67 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 0.000927555858868514 0.000916730351444305 0.000938465527164993 55.9637232067541 55.9582077572206 2456950.269785729 0.24835067700912 721.891931139447 217.102332274202 -44.1247905834497 448.992110125059 T 67 CATAB v2.0c-linF95 2014-Sep-12 14:32:01 2014-Sep-12 14:32
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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