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A User’s Introduction to the IRAF C...Started by:itso, 07/18/2008 03:00PM
Hi all!

I am relatively new to IRAF and I want
to improve. I read from different
sources that the best source as a start
would be "A User’s Introduction to the
IRAF Command Languag" by Shames and
Tody. I had a look for it on Google but
I couldn't fin...

2729

By: itso

07/18/2008 03:00PM

About imexamStarted by:boscoyung, 11/09/2006 08:47AM
Hi everyone!

I am currently using the 'imexamine'
task to take some simple measurements,
but I am not sure where I could find out
the errors. Say, if I use the curser key
'r' to plot a radial profile of a
certain star, using the gaussian fit,
how do I ...

3606

By: fitz

11/09/2006 08:47AM

About scaling, transformation and rot...Started by:jeffrey, 02/02/2009 02:28PM
I would like to ask a questions about
scaling, transformation and rotation of
FITS file, actually I got ~10 FITS which
has a small shifting, rotation and
scaling with each other, and in those
images, only one object has moved while
other background star...

2878

By: valdes

02/02/2009 02:28PM

about the exposure time of dark in cc...Started by:china_108, 02/20/2009 04:16AM
I combined 10 dark images of 30 seconds.
If the ccd images of my target have
exposure times of 50 seconds or 80
seconds or whatever, when I subtract the
dark from these images, iraf will
subtract the dark of the original 30
seconds from them or iraf wil...

2799

By: fitz

02/20/2009 04:16AM

Absolute value of a numberStarted by:piverson, 04/27/2008 02:36PM
Mike-

This is a dumb question, but is there an
absolute value command for real numbers
in IRAF? I have thought about importing
the abs() command from linux but all
comments say that it only works with int
(I thought this was weird). I can get
around th...

3479

By: piverson

04/27/2008 02:36PM

Accepted filenames rulesStarted by:pskoda, 06/09/2012 12:27PM
Hi Mike,

After some searching in forums I do not
still have complete answer for the
following question so I have to ask
here.

We are now considering radical changes
in our CCD acquisition system and people
want to introduce new more verbose
filenames ...

1976

By: pskoda

06/09/2012 12:27PM

Accessing the SLALIB routinesStarted by:FSBoyden, 10/12/2010 08:10AM
Hi

I want to correct some MJD values for
light arrival - i.e. correct to
Barycentre.

To do this I need to access some of the
SLALIB routine.

I used refer and help to identify the
specific routine to use - the Q is:

What is the easiest way to access/...

2346

By: fitz

10/12/2010 08:10AM

ACE and CRUTIL questionStarted by:Jason Quinn, 10/25/2007 03:30AM
Anyone know if the ACE (Astronomical
Cataloging Environment) package is
available for download somewhere? I've
looked all over. Don't really need it
but thought I'd install it.

Also, NOAO.IMRED contains a CRUTIL
package. It appears that version
distrib...

3325

By: valdes

10/25/2007 03:30AM

acknowledgementsStarted by:massey, 09/05/2007 04:47AM
Mike, et al---

Now that IRAF is no longer
NOAO-supported, what is the proper way
of
acknowledging it in a publication? I
still see "IRAF is distributed by the
National Optical Astronomy
Observatories...." But, that's not
really true
any more, is it? ...

2797

By: fitz

09/05/2007 04:47AM

Adding comments and history informati...Started by:joel, 02/15/2007 03:09AM
Howdy,
In some of my cl scripts, I would like
them to be able to add COMMENT and
HISTORY lines to a FITS header. I would
also like to add comment fields after
keywords (e.g., KEYWORD = VALUE /
comment). I can't seem to find a syntax
for HEDIT that wil...

4377

By: fitz

02/15/2007 03:09AM

adding observatory to obsdb.datStarted by:Sunshine, 06/02/2006 04:00AM
How can I add an observatory to my iraf
account? I don't need it added to the
general one.

Thanks.

9522

By: Sunshine

06/02/2006 04:00AM

adding small images to big imagesStarted by:dbrenner, 06/19/2009 02:56PM
I want to add a small image, say 10 by
10 to various locations in a large
image.
Can I do this? How?

Thanks

1722

By: dbrenner

06/19/2009 02:56PM

advice requested please: running IRAF...Started by:Guest, 06/30/2006 07:08PM
Hello! This somewhat of a strange
request, but I've been sending emails to
various astronomy-related websites
(observatories included) in order to get
some advice about laptops and Linux and
astronomy-related software (I haven't
been able to find any in...

3490

By: fitz

06/30/2006 07:08PM

after imarith command IRAF saving the...Started by:Sherry, 06/15/2011 09:09PM
I use IRAF to process onedspec from the
IRTF. The images are in pairs and are
subtracted to remove bias etc...
After I subtract the spectral image
pairs the new file is sub***.imh, but
IRAF is saving it as a fits file and I
am not able to extract the s...

5544

By: Sherry

06/15/2011 09:09PM

agetcat on usnob1@noao gives not 404 ...Started by:Santiago, 12/08/2016 01:45PM
Hi, i'm trying to solve some plates with
agetcat, ccmap, etc, and i cannot
download the usnob1@noao region, i get
an html 404 not found page. Was this
task deprecated or some? Maybe my way is
not fancy, anyways to plate solve with
other iraf package? My...

907

By: fitz

12/08/2016 04:23PM

AlignmentStarted by:e92m3, 11/25/2010 12:13PM
I took a series of exposure and I would
like to know whether there is a way to
align them such that a given star in the
different images will be at the same xy
coordinates. I want to do this
automatically without needing to go into
each image and identi...

2132

By: e92m3

11/25/2010 12:13PM

ambiguous parameter in imexprStarted by:dbrenner, 09/24/2009 05:37PM
imexpr ( expr= " ( ((sqrt
((I-125)*(I-125) + (J-125)*(J-125) )
> 10 *(a+ 1)) && ((sqrt
((I-125)*(I-125) + (J-125)*(J-125)) ))
=< 10 *(a + 2) ) ? 1: 0", output =
annulus//"[0,overwrite]", a =
"/data/masks/ringvalue.fits", dims =
dim, ver...

1927

By: fitz

09/24/2009 05:37PM

An error messageStarted by:smp, 06/04/2009 05:09AM
Hi,

While running my procedure script, I got
following error message:

[quote:11988285bd]*** glibc detected ***
free(): invalid pointer: 0x8005302e
***[/quote:11988285bd]

And then script stopped executing
further commands.

Why do I get this message a...

1611

By: fitz

06/04/2009 05:09AM

Analysing FITS files with WSTART1Started by:jsmoker, 11/17/2015 12:03PM
Hello,

I am working on some data reduced with
the UVES pipeline. The "merged" spectrum
produced by the pipeline has ripples in
it hence I am hoping to do the last part
of order merging "by hand" in IRAF.

The fits file contains 20 different
orders,...

2025

By: fitz

11/20/2015 04:55PM

And/or logic in IRAFStarted by:piverson, 07/27/2007 04:37PM
Is there and/or logic in IRAF and if so
do you have any short examples of its
use. I am trying to use it in a match
command.

i.e. match ("light" or "object",
"datalist1", > "datalist2")

Thanks,
Paul

3461

By: fitz

07/27/2007 04:37PM

Another ECL suggestionStarted by:jturner, 11/26/2006 09:49AM
Hi Mike,

First, thanks for implementing some of
the improvements I suggested previously
for ecl. The 2.13 version is quite nice
to use now.

Second, I have noticed something that I
think could be made more convenient.
When I enter an expression with "=...

3662

By: fitz

11/26/2006 09:49AM

Another problem with imalignStarted by:, 06/19/2006 07:59PM
Hi,

I know that there is lots of answers to
problems connecting to imalign, but I
couldn't find just similar to mine.

I have successfully used before imalign,
but this is new problem that I haven't
solved (with tens of other :).

About the problem. Im...

14331

By: moppi

06/19/2006 07:59PM

any one with any advice..Started by:james1986, 03/22/2008 12:13AM
i'm currently working using iraf, on my
final year thesis..

trying to use iraf for differiental
phototmetry..

i'm trying to get the instrumention
magnitudes from a set of stars from a
collection of images..

i have tried using imexamine but with
'a...

1641

By: fitz

03/22/2008 12:13AM

anybody did fors2 of vlt spectrum bef...Started by:haha, 11/08/2013 11:47AM
Q1
The wavelength range is fixed once the
grim of fors2 is choosed,right?
http://www.eso.org/sci/facilities/paranal/instruments/fors/inst/grisms.html
what is the wavlength range of g300v?
Q2
Who has the extinction file of Paranal
Observatory whic...

1178

By: haha

11/08/2013 11:47AM

apall command shifting the apertureStarted by:Sherry, 02/14/2012 07:39PM
IRAF is giving me apall centers that are
shifted by ~200 channels.
This is only happening with asteroid
spectra as apall is reading out the
correct cenrtwertd for bstandard star
spectra. What is going on?
linux 64 bit iraf v2.15.1a

1331

By: valdes

02/14/2012 07:39PM

Apall extracts only 26 pixelsStarted by:sirmarcos, 08/08/2008 08:34PM
Well, this is a new one. I'm befuddled.
apall is acting weird. I'm trying to
use it to extract some echelle scectra.
The apertures have already been found
and traced, but I let apall edit them
and review the tracings, everything
looks fine.

But the...

2737

By: sirmarcos

08/08/2008 08:34PM

apall outputStarted by:devereux, 06/25/2009 06:55PM
Is there a way to get apall to produce a
text file output of the extracted
spectrum
in columns of "flux" "wavelength" and
"error"?

If not, is there a way to get splot to
do this?

If not, is there any other way to get a
text version of the spectrum?

...

2616

By: valdes

06/25/2009 06:55PM

apall problemsStarted by:Bimal, 02/27/2008 05:51PM
Hi Mike, I am back after some time has
passed... I have problems with running
apall. Here is what it happens:
[quote:167dc4d6e0]
List of input images (ima0001.imh):
Recenter apperture for ima0001.imh
(yes):
Warning: OPEN: File does not exist
(localhost...

2284

By: Bimal

02/27/2008 05:51PM

apall's multispec vs echelle make dif...Started by:Jason Quinn, 06/05/2009 08:34PM
It appears that choosing "multispec" vs
"echelle" for the format parameter in
the apall task can produce different
APNUM keywords in the output headers. I
tested this on an image after unlearning
apall (actually the imred.kpnoslit
apall) and the relevan...

2558

By: Jason Quinn

06/05/2009 08:34PM

apextract-apall-edit apertures for......Started by:tomph, 03/21/2008 12:10PM
Hi again
To recap I am using cygwin, everything
has been working until this point.
I am using apall on raw images to
extract spectra, i believe i should have
a graph appear when it has worked
correctly.

I have used epar apall to set up most
the option...

2197

By: owen

03/21/2008 12:10PM

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