19 April 2018 at 10:40 pm #574005Adam RawlinsonParticipant
My first posting here and dont quite know what to do.
I have just been looking at M108 and I have convinced myself that a supernova is present.
Seems a bit unbelievable so is anyone any to check the attached image and/or have a look and confirm.?
I have a FIT file and taking some better exposures as we speak.
Dont shoot me down if this an error – but I cannot see an easy way to find out about reports and none of the images I have taken before have this pronounced bright point (normally seems far less bright)
Attachments:20 April 2018 at 5:03 am #579361
After reading your post I managed several images of M108 no filter at 60 and 30 sec and with a V filter at 60 sec at about 02.00-0230 UT on 2018-04-20
If you are referring to the bright centre (forground) star then this appears in images I’ve quickly looked at and hence do not think there is any urgency and will delay processing until later today as I’m far too tired now.
Eric (Essex, UK)20 April 2018 at 5:06 am #579362
Apologies I used a Celestron 14 edge + paramount MEII + QSI532
Eric20 April 2018 at 9:26 am #579363Mr Andrew Jonathan WilsonKeymaster
On this ocassion I think it is a foreground star. I’ve found some old images which show the bright star at that position.
Though this bright star near the centre is not always so obvious as can be seen from Graham Winstanley’s image.
It might be that it is a variable star, or possibly a very red star that shows up more prominently in some images than others depending on filters and equipment sensitivity. I’ve tried to identify the star to confirm its nature, but no luck.
Good call though as it is always a good idea to check images for the unexpected.
Andy20 April 2018 at 11:24 am #579364
It is very likely 2MASS 11112688+5540232 which is indeed quite red. V=12.538, J=11.272 according to Vizier.20 April 2018 at 4:51 pm #579366
Following my earlier posts I have attached a couple of my images. The foreground star is obvious, however, linear stretching reveals a fainter star close to this foreground star that gets lost in the glare of the brighter star. I’ve not yet checked to see if this is normal in other archived images.
Images taken on 2018-04-20 @ 02:37 and 02:21 hrs Ut Unfiltered @ 60sec and 20 sec exposure respectively.
Using C14 edge F:7.7, QSI 532 CCD camera, binned 3×3
I also have V filtered images should they be required.
Eric20 April 2018 at 6:36 pm #579368
That one looks like 2MASS 11112757+554027 with J=14.82220 April 2018 at 7:59 pm #579369
Thanks Paul, mystery solved it would seem.
Eric20 April 2018 at 8:28 pm #579370
Perhaps. IMAO you should check my assessment. I could well be wrong and have been many times in the past.20 April 2018 at 10:29 pm #579372
just checked an image on Wikipedia and the images match-no SN.
Eric21 April 2018 at 10:47 am #579373Mr Andrew Jonathan WilsonKeymaster
The online resources of SIMBAD and Aladin can be very useful for investigations.
Here is M108 in Aladin Lite displaying an SDSS9 image with 2MASS point sources:
Andy22 April 2018 at 12:32 am #579374Adam RawlinsonParticipant
Thanks folks for all those helpful replies.
Well I was glad I raised to question as now know where to look for verification etc…
Will keep looking though!
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