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when does ccxymatch fail?Started by:aoxsic, 09/02/2008 08:03PM
Dear IRAF staff,

I have some images with WCS in the
headers. I also have a list of RA DEC
coordinates of stars that could be used
for photometry. I want to run some IRAF
task, I guess ccxymatch, in order to
transform the RA DEC to pixel
coordinates. Th...

1852

By: valdes

09/02/2008 08:03PM

What does FITPARAMS do when only 1 fi...Started by:aoxsic, 04/21/2007 01:03AM
Does anyone know this? If I have only
one filter and prepare the observations
file and configuration file the right
way, and then run fitparam to get the
zero point, then what would the output
be?

It normally gives a catalog of stars and
then the magn...

2546

By: rjvo

04/21/2007 01:03AM

what are the general tasks like sextr...Started by:haha, 09/30/2014 12:51PM
I mean tasks in iraf.

859

By: haha

10/04/2014 01:34PM

Weird XDIMSUM problemStarted by:vall, 05/13/2009 03:10PM
I have a very weird problem with
XDIMSUM. It seems to work, but sometimes
one of the sky-subtracted imagesis
screwed up. What happens is that the
left ~200 columns in the image are
shifted last to the right of the image.
The rest of the images is shifte...

2965

By: valdes

05/13/2009 03:10PM

weird thing in IRAF's WCSStarted by:Guest, 10/13/2005 09:55PM
[b:aa520eeeb1]From:
[/b:aa520eeeb1]"Dmitry Bizyaev"
<dmbiz@noao.edu
([email]dmbiz@noao.edu[/email])>
[b:aa520eeeb1]Date: [/b:aa520eeeb1]July
28, 2005 4:19:00 PM MST
[b:aa520eeeb1]To:
[/b:aa520eeeb1]iraf@noao.edu
([email]iraf@noao.edu[/email])
[b:a...

3039

By: Guest

10/13/2005 09:55PM

Weird residuals in DAOPHOT PSFStarted by:jthorstensen, 12/05/2008 10:48PM
Hello Everyone,

We have a strange problem with the PSF
fitting in DAOPHOT. Has anyone else
run into this?

We are selecting stars manually and
looking at their radial profiles --
they're fine. But when we hit f to fit
the residuals, the RMS is much ...

3170

By: jthorstensen

12/05/2008 10:48PM

weighting scheme in the daophot psf taskStarted by:juge, 04/13/2017 09:41AM
Hi guys,

I use the psf task in daophot package to
build semi-emperical PSFs
(Gaussians+residuals) for my images. One
thing that puzzles me is that when the
gain parameter is arbitrarily adjusted,
output of the psf task does not change
at all. If the...

1398

By: valdes

04/25/2017 10:04PM

wcslabStarted by:duvall, 04/05/2006 06:38PM
I am having trouble getting wcslab to
put a grid around an image. It works
fine when
stdimage=imt512 but for larger frame
sizes, the grid info gets spewed all
over the window.
I am using ds9 and linux iraf. I set
wcslab.device=imdwhiite.
Thanks.
Tom ...

3102

By: fitz

04/05/2006 06:38PM

wcsctran and SIPStarted by:snd22, 03/30/2010 05:03PM
Hello,

I would like to use wcsctran (or an
equivalent task) to convert a list of
pixel coordinates on an image to a list
of RA/DEC sky coordinates using the WCS
defined in the image header. However, I
also need the conversion to respect the
SIP distor...

1363

By: fitz

03/30/2010 05:03PM

wcs using imeaxm and ds9Started by:jcadien1, 06/11/2013 11:18PM
I have images with wcs in header
computed by imwcs(from wsctools). When I
load an image into ds9 directly the wcs
info is displayed, and the "display fits
header" shows the entire header.
However, when I run "imexam filename
wcs=world" from the ecl, th...

2434

By: b1quint

07/01/2015 09:43PM

WCS Distortion ConventionsStarted by:snd22, 01/26/2010 10:34PM
Hello,

I have some distortion correction
parameters for a particular instrument
that are in the SIP format (stored in
the headers as "A_m_n", etc.). I would
like to convert these parameters to the
TNX format (header parameters named
"WAT*"). From wha...

2105

By: valdes

01/26/2010 10:34PM

WCS coordinates andStarted by:jh, 04/10/2006 10:46PM
Dear all IRAF users,
I have been dealing w/ optical images
from KPNO 2.1 m.
As you knew, fits files from 2.1m do not
have any information of WCS.
While I have been suggested to use tasks
from immatch package, I somehow
fell in love w/ msccmatch since, i...

3679

By: jh

04/10/2006 10:46PM

WCS and DS9Started by:massey, 08/15/2006 03:06PM
Hi, Mike et al---

This problem may be well known to
everyone, but I've found myself using
ds9 and discovered it. When I display
an image in ds9, it fails to pick up the
WCS. But, if I load the same fits file
into ds9 externally to IRAF (i.e.,
directl...

6594

By: fitz

08/15/2006 03:06PM

Wavelength units on NIR spectraStarted by:massey, 04/10/2017 09:58PM
I have some NIR spectra taken with FIRE
on Magellan that I reduced with their
IDL pipeline. When I splot the spectra,
they look fine, and the units on the X
axis are Angstroms--all well and good!
But, when I wspect the spectra to a text
file, the uni-...

1139

By: valdes

04/25/2017 10:14PM

Wavelength solution troublesStarted by:jeanm12, 10/29/2013 01:53AM
Hello,

I have lots of echelle data that I am in
the process of reducing. I have gone
through and used ecidentify to obtain an
accurate wavelength solution from one
night's data that I am using as the
basis for the rest of my nights. I then
have run e...

772

By: jeanm12

10/29/2013 01:53AM

Wavelength Dispersion ErrorStarted by:rohit, 05/04/2009 06:23PM
I have used ecidentify and ecreidentify
for high-res IR spectra. I would like to
compute the wavelength dispersion error
that I get from wavelength solution.
Could you please let me know how to find
that for each order?

1777

By: valdes

05/04/2009 06:23PM

wavelength and flux calibration files...Started by:haha, 11/27/2013 10:04AM
about wavelength calibration
Which arc files should I use?
There are no FORS2 calibration
files at http://www.eso.org/pipelines/.
However I tried FORS's files but
only found,say,

F2_GMDT_090210A_G300I_OG590_Norma.fits
is a 6x10 mat...

1246

By: haha

11/27/2013 10:04AM

Vogit. lorentzian & Guassian FWHMStarted by:Sparkles, 11/17/2010 08:06PM
Hi guys,

so I'm trying to model some spectra and
using the interactive "d" key in splot
to do it. plan is then to use the
resulting FWHM and convert to a
velocity. However when using a vogit you
get two FWHM one for the lorentizan and
on e for the guas...

2161

By: fitz

11/17/2010 08:06PM

Very slow annotation using tvmark + x...Started by:jturner, 12/20/2008 02:25AM
Our acquisition script uses tvmark to
overlay a simple line on a displayed
image indicating the slit position, like
so:
[code:1:2d6ed59427]printf
("%9.3f %9.3f 301 s \n",
l_x1, l_y1, > tmpin)
printf ("%9.3f %9.3f 301 s
...

7891

By: jturner

12/20/2008 02:25AM

Variable star phot with daophot?Started by:FSBoyden, 11/07/2006 01:25PM
Hi all.

I am new to daophot, and enc.

What I would like to ask is, when you do
varaible star photometry in batch mode
on a number if images, must the images
be properly alligned. That is, if you
sit with a problem of varying tracking,
and your images ...

3932

By: phil

11/07/2006 01:25PM

Variable PSFStarted by:Gaba_p, 07/16/2009 11:05PM
Hi all,

I'm trying to perform photometry on
frames with a variable PSF.
I found this on' A User's Guide to
Stellar CCD Photometry with IRAF' by
Massey & Davis:

The worst thing to find at this point is
that there is a systematic pattern with
positi...

1673

By: Gaba_p

07/16/2009 11:05PM

USNO-B1.0 Catalog access?Started by:LBT_Dave, 08/21/2006 11:24PM
Is there any hook in iraf (specifically
in mscred/mscgetcatalog) for access to
USNO-B1.0 data like there is for the
A2.0? The obvious does not seem to
work.

Thanks, Dave (LBTO)

7349

By: LBT_Dave

08/21/2006 11:24PM

Using wmosaic with FITS filesStarted by:lnxbil, 01/03/2008 03:48PM
Hi everyone,

I'm new to this software and get it
successfully installed on my Ubuntu
machine and everything seems to work
fine. I can login and use things like
[b:cefaafbf7b]STSDAS[/b:cefaafbf7b].
Furthermore, I'm not a astronomer I am a
computer scien...

2726

By: lnxbil

01/03/2008 03:48PM

Using SynphotStarted by:cosmologist, 06/12/2011 08:34PM
I am trying to use synphot to open the
1993 Kurucz model images ( available
here:
ftp://ftp.stsci.edu/cdbs/grid/k93models/
)

The instructions are here:

Synphot tasks now permit the use of
spectra selected from one of many
columns in a single STSDAS t...

1818

By: cosmologist

06/12/2011 08:34PM

Using seed = INDEF in addstar functionStarted by:MichaelCampbell, 12/11/2008 02:07PM
Hi,

I am trying to create lists with 100
random co-ordinates and magnitudes
within the addstar function. I wish to
create 100 different lists each
containing 100 stars. I have set the
seed function INDEF, but it doesn't
appear to work. Each list is the...

1614

By: fitz

12/11/2008 02:07PM

Using RVCORRECTStarted by:rohit, 12/12/2007 04:47PM
I would like to find V_helio correction
and therfore thought of using RVCORRECT.

Now as the observatory is KECK, I put
that in using epar rvcorrect under
observatory and as the year of
observation is all 2007 I have done the
same. I created a text fil...

6753

By: valdes

12/12/2007 04:47PM

Using RV FXCOR packageStarted by:rohit, 09/28/2007 09:50PM
I have been working on high-resolution
NIRSPEC data obtained from KECK to
calculate radial velocities. I have
reduced the spectrum of a target of
unknown RV (call the file tar.fits).
When I open this target in IRAF using
splot, I can use shift+ ( or ) t...

2782

By: IvanRamirez

09/28/2007 09:50PM

Using RSPECStarted by:rohit, 11/03/2007 03:28PM
I am trying to create an image file from
a text file. In my text file I have two
columns; wavelength and flux, like the
sample shown below. When I use RSPEC, it
plots the correct flux but arbitrary
wavelength scale, basically from 0 to
1000. I want it t...

3419

By: IvanRamirez

11/03/2007 03:28PM

using pdmStarted by:jcadien1, 07/08/2015 05:37PM
I am trying to use the IRAF pdm period
finder. I have begun by getting data on
a known variable, with cataloged period
of 86.5 days. Pdm seems to find a
period, regardless of the min/max range
I choose. The period is always between
the min/max. So, if I...

1578

By: jcadien1

07/09/2015 09:52PM

using mscred with Subaru Suprime Cam ...Started by:joshw, 06/06/2006 01:05AM
I'm about to try reducing Suprime Cam
data from Subaru. Suprime is a wide
field camera similar to Mosaic with 10
CCDs instead of 8. I've reduced a lot
of KPNO and CTIO Mosaic data and am
familiar with mscred, so I was hoping to
use it for Suprime cam ...

3177

By: fitz

06/06/2006 01:05AM

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