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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 2456533.5 (2013-Aug-29.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000606925639957 3.4417e-06  
a -2304.973317163849 13.072 AU
q 1.398947405603506 5.3875e-06 AU
i 129.0270739116052 2.5076e-05 deg
node 300.9754751992989 6.9004e-05 deg
peri 2.438175914634823 0.00016882 deg
M -.003761901740381517 3.1995e-05 deg
tp 2456955.878912085539
(2014-Oct-25.37891209)
0.00088348 JED
period n/a
n/a
n/a
n/a
d
yr
n 8.906462024362776E-6 7.5764e-08 deg/d
Q n/a n/a AU
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      638 days (1.75 yr)  
   first obs. used      2012-10-04  
   last obs. used      2014-07-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   fit RMS      .41586  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 11:52:56  

Additional Information
 Earth MOID = .383754 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 51 2 parameter fit from 181 observations, autocmod 2.5c
comet total magnitude slope K1 7.   n/a 51 autocmod 2.5c

[ 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 18:33 < 00:01 Mars 0.000875731990904132 0.000854644609078469 0.000896936477534995 55.9637454950638 55.9579036388058 2456950.273125496 0.735002753169696 1175.67980816112 321.307359944974 -27.8446206652964 204.091860180245 T 51 CATAB v2.0c-linF95 2014-Jul-14 11:52:59 2014-Jul-14 11:53
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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