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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 JED
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  
   fit RMS      .30255  
   data 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 mag 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 mag 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

[ 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 18:29 < 00:01 Mars 0.000939164098618428 0.000939084403330223 0.000939243793897697 55.9632438367936 55.9577965158768 2456950.269839177 0.0140160745903975 3.95915095393488 3.44583694587973 -2.59746655184413 34496.4261864985 T 105 CATAB v2.0c-linF95 2016-Apr-22 14:12:01 2016-Apr-22 14:12
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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