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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 September, 26 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
07h 40m 51s
+37° 06’ 13”

The Observed Magnitude and Coma Diameter values are derived from the Comet Observers Database by averaging the values reported in recent observations (more recent than 4 days), when available. The Estimated Magnitude comes from the JPL Horizons ephemerides service and might be inaccurate given the highly dynamic and unpredictable behvior of comets. When available please refer to the Observed Magnitude value and consider the Estimated Magnitude as a directional indication. We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations.

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

Today's Comet C/2012 S1 (ISON) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 52.9°
Max altitude: 75.6°
Azimuth: 307.1°

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 Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Sep 19 07h 40m 05s +37° 01’ 33” N.A. Lynx
2018 Sep 20 07h 40m 11s +37° 02’ 08” N.A. Lynx
2018 Sep 21 07h 40m 18s +37° 02’ 44” N.A. Lynx
2018 Sep 22 07h 40m 26s +37° 03’ 21” N.A. Lynx
2018 Sep 23 07h 40m 32s +37° 04’ 00” N.A. Lynx
2018 Sep 24 07h 40m 39s +37° 04’ 39” N.A. Lynx
2018 Sep 25 07h 40m 45s +37° 05’ 18” N.A. Lynx
2018 Sep 26 07h 40m 50s +37° 06’ 00” N.A. Lynx
2018 Sep 27 07h 40m 55s +37° 06’ 42” N.A. Lynx
2018 Sep 28 07h 41m 00s +37° 07’ 23” N.A. Lynx
2018 Sep 29 07h 41m 05s +37° 08’ 08” N.A. Lynx
2018 Sep 30 07h 41m 09s +37° 08’ 52” N.A. Lynx
2018 Oct 01 07h 41m 14s +37° 09’ 37” N.A. Lynx
2018 Oct 02 07h 41m 18s +37° 10’ 23” N.A. 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.