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Re: convert to pixel to RA and DEC in degrees? [message #49581 is a reply to message #49561]

Wed, 02 August 2006 09:57

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

xyad.pro in the IDL Astronomy library does return the RA and Dec vectors as
double precision

IDL> xyad,h,23,23,aa,dd
IDL> help,aa,dd
AA DOUBLE = -0.0063888890
DD DOUBLE = 0.0063888890

Perhaps you are confused by the optional printing, which is to display to
tenths of a degree in declination

IDL> xyad,h,23,23
X Y RA DEC RA_2000 DEC_2000
23.00 23.00 -0.0064 0.0064 23 59 58.47 +00 00 23.0

The hr mn sc display format can be adjusted using the the PRECISION keyword

IDL> xyad,h,23,23,precis=4
X Y RA DEC RA_2000 DEC_2000
23.00 23.00 -0.0064 0.0064 23 59 58.46667 +00 00 23.0000

--Wayne

<adisn123@yahoo.com> wrote in message
news:1154536095.539610.137920@i3g2000cwc.googlegroups.com...
> Does anyone know a procedure which does converting job from pixel
> coordinates to RA and DEC in degrees using the image's fits header?
>
> I know there is xyad procedure in IDL library, but I want my result
> goes up to double precision.
>
> Is there any better one than xyad?
>
> Thanks.
>

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[Message index]

		Re: convert to pixel to RA and DEC in degrees? By: adisn123 on Thu, 03 August 2006 09:45
		Re: convert to pixel to RA and DEC in degrees? By: Craig Markwardt on Thu, 03 August 2006 07:12
		Re: convert to pixel to RA and DEC in degrees? By: Wayne Landsman on Wed, 02 August 2006 09:57
		Re: convert to pixel to RA and DEC in degrees? By: adisn123 on Wed, 02 August 2006 09:50

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