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Observing >> Variable Star Observing and Radio Astronomy

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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Galaxy list for SN hunting
      #5487699 - 10/24/12 09:41 PM

In the near future when I get a LX200 12" or 14" I will start to hunt for SN. I know there is the RC3 list and probably some others. Does anyone have links to the actual list? Also I would I go about using the list with a program that will automate the telescope.

Anyone here that hunts for SN on a regular bases, could you show/tell how you go about the hunt?


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StupendousMan
super member


Reged: 08/21/05

Re: Galaxy list for SN hunting new [Re: Nick Rose]
      #5488744 - 10/25/12 02:30 PM

http://cdsarc.u-strasbg.fr/viz-bin/Cat?VII/155

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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: Galaxy list for SN hunting new [Re: StupendousMan]
      #5488840 - 10/25/12 03:35 PM

I was able to find this site: http://www.beares.net/r/astro/obs/galaxies/rc3_making_lists.htm This guy Richard Beare made a excel file of the RC3 list where you can put in you requirements.

But since I'm so new to this I need help on what numbers to put.


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StupendousMan
super member


Reged: 08/21/05

Re: Galaxy list for SN hunting new [Re: Nick Rose]
      #5492277 - 10/27/12 09:08 PM

What do you want to know? If you're interested in finding supernovae, you need a list of galaxies that are

a) close enough that a supernova would be easily visible in your telescope

b) visible from your site for reasonably long periods of time

c) few enough that you can visit each galaxy about once every 3 or 4 nights

So, figure out the limiting magnitude of your system, and pick galaxies with distance moduli which are roughly (your limiting magnitude + 16) or so. That should yield supernovae which your system can detect for a few weeks, at least.


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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: Galaxy list for SN hunting new [Re: StupendousMan]
      #5493740 - 10/28/12 09:31 PM

Right now I only have my 6" Reflector. Since I can faintly see a mag15 galaxy with 100sec, lets say I pick limiting mag of 13 or 14(I know it seems bad but I guess that's because I'm in a Red zone). So I add that to 16 to get my DM. Is that correct? Doesn't size of the galaxy also come into play. The mag15 IC5180 I picked up was I think 1.1arc min.

Edited by Nick Rose (10/28/12 11:03 PM)


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Galaxy list for SN hunting new [Re: Nick Rose]
      #5494595 - 10/29/12 12:48 PM

Quote:

Right now I only have my 6" Reflector. Since I can faintly see a mag15 galaxy with 100sec, lets say I pick limiting mag of 13 or 14(I know it seems bad but I guess that's because I'm in a Red zone). So I add that to 16 to get my DM. Is that correct? Doesn't size of the galaxy also come into play. The mag15 IC5180 I picked up was I think 1.1arc min.


I'm confused if you intend to do visual or imaging SN hunt From the Red Zone you should get down to mag 17/18 stars in ~30s exp with a sensitive [perferably mono] CCD camera + C14 with no trouble - good luck - it's a needle-in-a-haystack enterprise. Check out Bright Supernova homepage

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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: Galaxy list for SN hunting new [Re: nytecam]
      #5494681 - 10/29/12 01:48 PM

Imaging that's why in the last post I was talking about the exposure and faint galaxy I could pick out. Since I wont have the new equipment for a long time I just what to find out about my current setup. Its a 6" Reflector on a GOTO mount with a Orion StarShoot Deep Space Mono Imager III. With this setup I can faintly image a 15mag galaxy. That galaxy was IC5180.

Edited by Nick Rose (10/29/12 01:49 PM)


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Galaxy list for SN hunting new [Re: Nick Rose]
      #5494920 - 10/29/12 04:20 PM

Quote:

Imaging that's why in the last post I was talking about the exposure and faint galaxy I could pick out. Since I wont have the new equipment for a long time I just what to find out about my current setup. Its a 6" Reflector on a GOTO mount with a Orion StarShoot Deep Space Mono Imager III. With this setup I can faintly image a 15mag galaxy. That galaxy was IC5180.


How faint can you record stars? SNe are stars - gxys are diffuse and not a useful guide as to how faint you can record stars in a given exposure

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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: Galaxy list for SN hunting new [Re: nytecam]
      #5494990 - 10/29/12 05:03 PM

I actually don't know. I'll have to look at some subs and see what the faintest star is.

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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: Galaxy list for SN hunting new [Re: Nick Rose]
      #5495657 - 10/30/12 01:09 AM

Ok, I checked and it seems like I can pick up 16mag and faintly 17mag

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