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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:46 
Transit: 13:03 
Sunset: 21:19
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Comets » 

Comet C/2012 S1 (ISON)

Above the horizon.  Rise: 3:26 | Tran: 14:01 | Set: 0:36
Alt: 31.61°   Az: 69.27°   Direction: South-West

Comet C/2012 S1 (ISON) is in the constellation of Auriga, at a distance of 4,670,690,760.0 kilometers from Earth. The current Right Ascension is 07h 25m 12s and the Declination is +36° 42’ 45” (apparent coordinates).

Finder Charts

The sky charts below show, at different resolutions, the position of comet C/2012 S1 (ISON) in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of comet C/2012 S1 (ISON) in the constellation of Auriga on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of comet C/2012 S1 (ISON) in the constellation of Auriga on F, d Y. Field of view: 15x9 degrees. View in interactive star map.

The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet C/2012 S1 (ISON) against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.

C/2012 S1 (ISON)
RA: 07h 23m 30s
Dec: +36° 45’ 48”
Simplified high-resolution deep sky chart showing the current position of comet C/2012 S1 (ISON). Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

07h 25m 12s
+36° 42’ 45”
18h 25m 58s
01h 51m 11s

J2000

07h 23m 30s
+36° 45’ 48”

Additional Information

Auriga
n/a
n/a
n/a
n/a
-

The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted 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.

Rise and Set Times

The following table lists today's rise, transit and set times of comet C/2012 S1 (ISON) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 53.3°
Max altitude: 75.2°
Azimuth: 306.7°

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Distance from Earth

The distance of comet C/2012 S1 (ISON) from Earth is currently 4,670,690,760.0 kilometers, equivalent to 31.2216393064 Astronomical Units. Light takes 4h 19m 39.747s to travel from comet C/2012 S1 (ISON) and arrive to us.

4,670,690,760.0
31.2216393064
4h 19m 39.747s

The following graph shows the distance of comet C/2012 S1 (ISON) from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.

Chart of the distance of comet C/2012 S1 (ISON) from Earth in Astronomical Units (au)
Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).

The value of the distance of C/2012 S1 (ISON) from Earth is also available as a real time updated value in the live position tracker.

Closest Approach to Earth

In the period between January 1, 2000 and December 31, 2099, the closest approach of comet C/2012 S1 (ISON) to Earth happened on Friday 27 December 2013 at a distance of 0.430624 Astronomical Units, or 64,420,498 kilometers:

Friday 27 December 2013
64,420,498
0.430624

Note: the values for the closest approach are computed with a sampling interval of 1 day.

Light Curve

Orbital Elements

The following table lists the orbital elements of comet C/2012 S1 (ISON) at epoch April, 30 2013 00:00 UTC (JD: 2456413.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00000510
Orbit inclination i 62.16289398°
Perihelion distance q 0.01246671 AU
1,864,994 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp November 28, 2013
2,456,625.2645 JD
Argument of perihelion peri 345.54119894206°
Longitude of the ascending node node 295.68654180456°
Mean anomaly M -0.00172478090192°
Mean motion n 0.00000814°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of comet C/2012 S1 (ISON) relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.

15 Days 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. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
Jun 20 2025 07h 24m 08s +36° 45’ 38” N.A. Auriga
Jun 21 2025 07h 24m 17s +36° 45’ 13” N.A. Auriga
Jun 22 2025 07h 24m 26s +36° 44’ 49” N.A. Auriga
Jun 23 2025 07h 24m 35s +36° 44’ 25” N.A. Auriga
Jun 24 2025 07h 24m 44s +36° 44’ 01” N.A. Auriga
Jun 25 2025 07h 24m 52s +36° 43’ 37” N.A. Auriga
Jun 26 2025 07h 25m 01s +36° 43’ 15” N.A. Auriga
Jun 27 2025 07h 25m 10s +36° 42’ 52” N.A. Auriga
Jun 28 2025 07h 25m 19s +36° 42’ 29” N.A. Auriga
Jun 29 2025 07h 25m 28s +36° 42’ 08” N.A. Auriga
Jun 30 2025 07h 25m 37s +36° 41’ 47” N.A. Auriga
Jul 01 2025 07h 25m 46s +36° 41’ 25” N.A. Auriga
Jul 02 2025 07h 25m 56s +36° 41’ 04” N.A. Auriga
Jul 03 2025 07h 26m 05s +36° 40’ 44” N.A. Auriga

Additional Resources on TheSkyLive