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Comet C/2012 S1 (ISON)

Available Resources

Comet C/2012 S1 (ISON) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2012 S1 (ISON) is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Comet C/2012 S1 (ISON) in Lynx on December, 14 2017
High Precision Live Sky Chart
07h 33m 51s
+38° 47’ 30”
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Comet C/2012 S1 (ISON) Rise and Set Times

Comet C/2012 S1 (ISON) is circumpolar from Greenwich, United Kingdom [change] and transits at 02:02 UTC (altitude: 77.3°)

Comet C/2012 S1 (ISON) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2012 S1 (ISON) with respect of the Sun and the orbits of the major planets. The position of Comet C/2012 S1 (ISON) and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Comet C/2012 S1 (ISON)
View Comet C/2012 S1 (ISON) in the 3D Solar System Simulator

Comet C/2012 S1 (ISON) Ephemeris

The following table lists the ephemerides of Comet C/2012 S1 (ISON) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2012 S1 (ISON) in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2017 Dec 07 N.A. 07h 36m 02s +38° 39’ 07” Lynx
2017 Dec 08 N.A. 07h 35m 44s +38° 40’ 23” Lynx
2017 Dec 09 N.A. 07h 35m 26s +38° 41’ 35” Lynx
2017 Dec 10 N.A. 07h 35m 08s +38° 42’ 48” Lynx
2017 Dec 11 N.A. 07h 34m 50s +38° 44’ 00” Lynx
2017 Dec 12 N.A. 07h 34m 31s +38° 45’ 11” Lynx
2017 Dec 13 N.A. 07h 34m 12s +38° 46’ 22” Lynx
2017 Dec 14 N.A. 07h 33m 51s +38° 47’ 30” Lynx
2017 Dec 15 N.A. 07h 33m 33s +38° 48’ 38” Lynx
2017 Dec 16 N.A. 07h 33m 12s +38° 49’ 45” Lynx
2017 Dec 17 N.A. 07h 32m 53s +38° 50’ 52” Lynx
2017 Dec 18 N.A. 07h 32m 33s +38° 51’ 56” Lynx
2017 Dec 19 N.A. 07h 32m 12s +38° 52’ 59” Lynx
2017 Dec 20 N.A. 07h 31m 51s +38° 54’ 02” Lynx

Distance of Comet C/2012 S1 (ISON) from Earth

The following chart shows the distance of Comet C/2012 S1 (ISON) from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2012 S1 (ISON) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2012 S1 (ISON) from Earth between January 2013 and December 2075

Light Curve of Comet C/2012 S1 (ISON)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2012 S1 (ISON), according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Comet C/2012 S1 (ISON) between January 2013 and December 2075

Comet C/2012 S1 (ISON) Orbital Elements

The following table lists the orbital elements of Comet C/2012 S1 (ISON) at epoch 03 December 2013 00:00 UTC (JD: 2456630.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00020100
Orbit inclination i 62.40397752°
Perihelion distance q 0.01245259 AU
1,862,881 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2013-Nov-28 18:41:16
2,456,625.2787 JD
Argument of perihelion peri 345.53124062058°
Longitude of the ascending node node 295.65203155°
Mean anomaly M 0.010553658639203°
Mean motion n 0.00202125°/day
Closest approach to Earth* 2013-Dec-27
Distance of closest approach* 0.43060397 AU
64,417,437 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2075-Dec-31, with a sampling interval of 1 day.