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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 2456505.5 (2013-Aug-01.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000604515347663 6.122e-06  
a -2314.311724635852 23.435 AU
q 1.399036956818885 7.3372e-06 AU
i 129.0266593549997 3.1912e-05 deg
node 300.9743378699729 8.3708e-05 deg
peri 2.435502966380776 0.00033199 deg
M -.003987098605085023 6.055e-05 deg
tp 2456955.886833306343
(2014-Oct-25.38683331)
0.0013655 JED
period n/a
n/a
n/a
n/a
d
yr
n 8.852609157810546E-6 1.3446e-07 deg/d
Q n/a n/a AU
  Orbit Determination Parameters
   # obs. used (total)      597  
   data-arc span      516 days (1.41 yr)  
   first obs. used      2012-10-04  
   last obs. used      2014-03-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   fit RMS      .39642  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2014-Mar-14 12:52:28  

Additional Information
 Earth MOID = .383677 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 8.6 mag 0.5 46 2 parameter fit from 161 observations, autocmod 2.5c
comet total magnitude slope K1 7.   n/a 46 autocmod 2.5c
comet nuclear magnitude M2 10.4 mag 0.6 46 from 436 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 46 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 46 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 18:30 00:01 Mars 0.000903808591320195 0.000873506681156686 0.000934208071459073 55.9637531777212 55.9580928073037 2456950.270887061 1.01848163749905 1597.15466006718 705.004395076874 -21.5990298100071 101.745618772633 T 46 CATAB v2.0c-linF95 2014-Mar-14 15:32:01 2014-Mar-14 15:32
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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