last update
12:27 UTC
SFI: 81 | Ap index:  26  | Kp index:  3  ( 3 +39m,  4 +219m) | X-ray flux:  B1.1 
SW: Density= 1.1 p/cm3 | Speed= 592.0 km/s | Temp=296(x1000)K
IMF: Bx=-4.3nT | By=-0.9nT | Bz= 2.1 nT | Bt= 4.9 nT | Lat= 25.8 ° | Lon=191.2°
Sunspots: 11 | Area: 30 10-6/Hemi | New regions: 0
[i]X-ray flares: C=0 M=0 X=0 | Optical flares: M1=0 M2=0 M3=0 | Sub-flares=1
Comet C/2012 S1 (ISON) is now visible in the ENLIL spiral models. It is represented by a pink rectangle near Mars (as of 27 Sep). You can track its position with the newly released models.

C/2012 S1 (ISON) will come to perihelion (closest approach to the Sun) on 28 November 2013 at a distance of 0.012 AU (1,800,000 km; 1,100,000 mi) from the center point of the Sun. Its trajectory is nearly parabolic, which suggests that it may be a dynamically new comet coming freshly from the Oort cloud. On its closest approach, C/2012 S1 will pass about 0.0724 AU (10,830,000 km; 6,730,000 mi) from Mars on 1 October 2013, and it will pass about 0.429 AU (64,200,000 km; 39,900,000 mi) from Earth on 26 December 2013. Earth will pass near the orbit of ISON on 14–15 January 2014, well after the comet has passed, when micron-sized dust particles blown by the Sun's radiation may cause a meteor shower, or noctilucent clouds.


Predicted hour-by-hour position of Comet ISON in the COR2-A/B (blue) and COR1-A/B (green) fields-of-view between 06:00UTC on November 26, and 00:00UTC on November 30:

Day-by-day position in the HI2-A field-of-view:
Oct 10 on the left, to Nov 23 on the right:
EUVI-B in 10min intervals
17:50UTC to 20:00UTC on Nov 28, 2013:

Predicted day-by-day position in the HI1-A/B field-of-view
(HI1-A: Nov 21-28 from left to right; HI1-B: Oct 24-Nov 25 from right to left, assuming a roll of 180°)


The LASCO C2 and C3 coronagraphs on the Solar and Heliospheric Observatory (SOHO) satellite will also have a view of the comet as it passes through their fields-of-view, as shown below.

Predicted hour-by-hour position of Comet ISON in the LASCO C3 (blue) and C2 (red) fields-of-view on SOHO, November 27-30, 2013.

From SOHO's viewpoint the comet enters from the lower right early on November 27 and exits towards the top near the end of November 30.

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