Comet ISON is approaching

Comet ISON will shortly appear in images from our suite of Sun-watching instruments available via the Helioviewer Project. It has already been seen in images from the Heliospheric Imager onboard STEREO.

Comet ISON will first appear in LASCO C3 at 02:00 UT on Wednesday 27th November, and will appear in the LASCO C2 field-of-view at 13:00 UT on Thursday 28th November.

Path of COMET ISON as seen from SOHO

Path of COMET ISON as seen from SOHO LASCO C2 and C3 coronagraphs.

The comet will exit the LASCO C2 field of view at C2 field-of-view at 23:00 UT on Thursday November 28, and the C3 field-of-view at 23:00 UT on Friday, 29th November.

Comet ISON will also move in to the SDO field of view. SDO is taking special observations of the passage of the comet in order to learn more about what happens to a comet so close to the Sun. You’ll be able to see some of the latest available images from SDO at

Please note that images will not be available precisely the times mentioned here since it takes time for the data to be downloaded from their spacecraft and processed on the ground. We will endeavor to ensure that all out users will be able to see this rare event

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  1. #1 by Владимир on November 28, 2013 - 8:19 pm

    Когда уже мы будем наблюдать за кометами из туристического космокоробля на близком расстоянии?

  2. #2 by Lee on November 30, 2013 - 1:04 am

    Love the project, superb stuff. I tried downloading the helioviewer for Mac OSX from the site but each time I tried installing it it said the “JHelioviewer” is damaged and can’t be opened. You should eject the disk image”. Been looking all over the place for a way to contact someone for assistance, figured I’d try here.

    • #3 by jack on November 30, 2013 - 2:29 pm

      We are glad that you are enjoying Helioviewer.

      Which version of Mac OSX are you using? In more recent versions of OSX you need to tell OSX that it is OK to install applications that were downloaded NOT using Apple’s App Store. If you don’t tell your computer it is OK to install such applications the operating system can report errors such as the one you are encountering.

      You can try changing some settings on your machine to allow applications to be run. For more instructions, please go to


      If you are still having problems, please contact us again.


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