[AstroPy] Past Mention of Source Extractor Command in IRAF?

Rick Wagner rwagner@physics.ucsd....
Tue Apr 28 22:07:58 CDT 2009


Hi,

Out of curiosity (and some background knowledge), I did some hunting  
around on the IRAF site. My original comment was going to be that  
SExtractor [1], is an independent tool, which "builds a catalogue of  
objects from an astronomical image", and is separate from IRAF [2],  
which is designed for image manipulation. And I was going to agree  
with Rose that what you were probably looking for was astrometry.net.

However, what I found on the IRAF site was this entry in the FAQs:
Is there an ASTROMETRY package I can use?
http://tinyurl.com/dl7sly

Now, what I think your looking for is the imcoords package in IRAF,  
which includes functions like this [3]:

ccfind: Locate reference catalog objects in images
ccxymatch: Match celestial and pixel coordinate lists

Hope I'm close, if not, I hope this didn't take up too much of your  
time.

--Rick

[1] SExtractor - http://tinyurl.com/cbhk4r
[2] IRAF - http://iraf.net
[3] http://iraf.noao.edu/irafnews/apr98/irafnews.14.html
>


> Just IRAF. Well, I can easily get around this in a paper I'm  
> writing by
> just saying that IRAF is another tool that does source extraction.  
> BTW,
> who created IRAF and who supports it?   I found the install pdf.  
> Ah, NOAO.
>
> I don't have it installed, since I'm on Win. I did did install Cygwin,
> but never got around to installing it there. It's not something I need
> immediately.
>
> Rose Finn wrote:
>> I am not sure if you are referring to astrometry.net, but I think it
>> does much of what you describe:
>>
>> http://astrometry.net/
>>
>> Take care,
>> Rose
>>
>> On Tue, Apr 28, 2009 at 8:25 PM, Wayne Watson
>> <sierra_mtnview@sbcglobal.net> wrote:
>>
>>> Probably not, but is what you mentioned source extraction? The  
>>> idea is
>>> that you take a picture of some part of the night sky, and then  
>>> turn it
>>> over to the source extractor. It twists, rescales, and turns your  
>>> image
>>> every which way until it matches 10 or more corresponding objects
>>> (stars, etc.) in a photographic atlas of some sort. If it looks  
>>> right,
>>> you can then extract information about those objects and maybe  
>>> others.
>>> It's an astrometric tool.
>>>
>>> James Turner wrote:
>>>
>>>>> I believe in some of my exchanges on this mailing list in the last
>>>>> many works someone mentioned an IRAF facility akin to what is
>>>>> popularly called source extract. Mention was made of what could be
>>>>> considered a command name that somehow is used in connection  
>>>>> with the
>>>>> idea. Does anyone know what that single (command) word was or  
>>>>> where I
>>>>> would find the extractor topic discussed in IRAF?
>>>>>
>>>> Is it noao.digiphot.apphot (type "help apphot")?
>>>>
>>>> James.
>>>>
>>>>
>>> --
>>>           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
>>>
>>>             (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>>>              Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet
>>>
>>>           All the neutrons, and protons in the human body occupy
>>>           a cube whose side is 5.52*10**-6 meters (tiny!). That
>>>           adds up to a 150 pound person. It's not a surprise that
>>>           we are mostly space. (Calculation by WTW)
>>>
>>>
>>> _______________________________________________
>>> AstroPy mailing list
>>> AstroPy@scipy.org
>>> http://mail.scipy.org/mailman/listinfo/astropy
>>>
>>>
>>
>>
>>
>>
>
> -- 
>            Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
>
>              (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
>               Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet
>
>            All the neutrons, and protons in the human body occupy
>            a cube whose side is 5.52*10**-6 meters (tiny!). That
>            adds up to a 150 pound person. It's not a surprise that
>            we are mostly space. (Calculation by WTW)
>
>
>
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> AstroPy mailing list
> AstroPy@scipy.org
> http://mail.scipy.org/mailman/listinfo/astropy
>



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