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Last Post

Bug? Does FITPSF output RSIGMA or HWHM?Started by:csimpson, 06/02/2011 05:18PM
Edit: should have said I'm running IRAF
V2.15 on Fedora 13.

I'm running digiphot.apphot.fitpsf on an
image to fit circular gaussians
(radguass) to stars but find that the
values it outputs are always too large
when compared to imexam. The help says
tha...

1628

By: valdes

06/02/2011 05:18PM

Can task IMSURFIT work for multi circ...Started by:owen, 01/06/2009 04:17PM
Hi, I am faced with a problem on the
task imsurfit. If I set 'circle' in its
'region' option, it can only work for
one circle. But I have a number of
circles in images, what should I do? In
fact, what I want to do is to fit
regions exterior to the circl...

1628

By: valdes

01/06/2009 04:17PM

ccdmask errorStarted by:jdm, 11/21/2012 10:28PM
Hi,

I'm trying to create a bad pixel mask
for each panel of a six-chip mosaic
image. I run mscarith to divide one flat
by another (creating ratio.fits), and
then I run ccdmask individually for
ratio.fits[1] through ratio.fits[6]. It
creates the first f...

1629

By: jdm

11/21/2012 10:28PM

Mosaic Split and Mosaic RotateStarted by:David Emory, 10/08/2008 12:18AM
Two Questions
1. When I split a mosaic file, all the
headers for the split images have the
sane original R.A/Dec from the original
mosaic. Is there a way to split mosaic
files and have the new individual images
have the proper coordinates in the new
hea...

1632

By: valdes

10/08/2008 12:18AM

SDSS catalogs in astcatStarted by:vall, 03/23/2010 11:42PM
Hello,

I have a simple question. Is it possible
to access the SDSS catalogs from the
ASTCAT package and if yes, what changes
should be made to the relevant database
files? I would like to be able to access
the images, as well as the photometric
and ast...

1633

By: vall

03/23/2010 11:42PM

imcalc command line for combing imagesStarted by:jaclyndp, 06/24/2009 03:18PM
If I have a list of images to simply
combine (just adding each corresponding
pixel value), what should the command
line read? I'm not sure of the syntax.
Thanks!

1634

By: fitz

06/24/2009 03:18PM

ds9 errorStarted by:donzelli, 08/26/2015 03:10PM
Hi,
I installed ds9.linux64.7.3.2 under
Fedora 22 (64-bit), and when I run ds9 I
get:

./ds9: error while loading shared
libraries: libXss.so.1: cannot open
shared object file: No such file or
directory

However, the library is already
installed in...

1639

By: donzelli

08/26/2015 06:18PM

Silent APALLStarted by:gzhou, 03/01/2011 04:35AM
Hi,

I'm trying to write a pyraf script for
apall. I have interactive and review
turned off when running apall via the
script, but can't find a way to remove
the prompt

Number of apertures to be found
automatically (1):

even though I set the aperture...

1644

By: gzhou

03/01/2011 04:35AM

MSCDISPLAY produce imaginary noiseStarted by:johannes1808, 12/11/2009 02:53PM
HI

I have some problems with the mscred
task mscdisplay. When I am looking at my
data with mscdisplay and ds9 many noise
were produced, this noise does not occur
when using display and furthermore the
initial data does not have that thing.
Im using IRA...

1646

By: johannes1808

12/11/2009 02:53PM

PSF + matchbyid=noStarted by:vall, 10/29/2010 08:57AM
Hi,

What is the matching radius in PSF if
the parameter matchbyid=no? I would
guess it is "matchrad" in "daopars", but
this does not seems to be documented
anywhere. Could you please confirm?
Thanks.

Vallery

1648

By: vall

10/29/2010 08:57AM

how to apply an aperture fit to multi...Started by:kyle.h, 03/28/2010 11:25PM
Hi all,

I would like to apply an aperture trace
from an image to multiple rows of that
same image. In other words, I want to
define an aperture initially, trace it
initially, fit it, and then use that
very same fit on another row of pixels
on my 2D im...

1649

By: kyle.h

03/28/2010 11:25PM

Trouble with Isophote packageStarted by:mostskier, 07/21/2009 02:29PM
Hi,

I am trying to perform surface
photometry on an optical image of a
galaxy to create a surface brightness
profile as a function of galactocentric
radius. I have been trying to use the
ellipse task in the Isophote package to
do this.

The problem ...

1653

By: valdes

07/21/2009 02:29PM

FXCOR questionStarted by:Guest, 04/08/2009 05:03PM
Hello,

Is it possible to turn off the
calculation of the heliocentric
correction for
a template star in the FXCOR package? I
want to use a synthetic template
which of course has zero velocity.

many thanks for your help,

Ian Thompson

1655

By: fitz

04/08/2009 05:03PM

computing error in EWStarted by:rohit, 04/27/2009 12:23PM
I use the SPLOT task to obtain the
equivalent width, however, IRAF does not
give me the precision or the error
involved in measuring EW. Is there
something I need to enable? How do I get
the error in EW?

Thanks,

1660

By: valdes

04/27/2009 12:23PM

how to use tcreate with x_ttools fro...Started by:fjjames, 01/04/2011 03:08AM
I need to create a table from the
command line.
From the >cl prompt, I can issue
tcreate table cdfile datafile, where
table is the output file, and cdfile and
datafine are input files, and everything
works.

However, I need to do this outside of
iraf...

1661

By: fitz

01/04/2011 03:08AM

Problem(s) with scombineStarted by:jdonley, 12/10/2008 12:24AM
I'm having two problems with scombine.
The first is that none of the cosmic ray
rejection algorithms work when I feed
flux-calibrated spectra into scombine.
Should they?

Second, if I extinction calibrate my
individual spectra, combine them in
scombin...

1663

By: valdes

12/10/2008 12:24AM

How to Change String to Number in tableStarted by:Quietskies, 08/05/2009 11:22AM
Hi

I met a problem when I tried to rebin
some spectra in text format.

The format is like :

Wavelength Flux
1000 1.000E29
1005 1.0100E29
...... ........

But when I tried to rebin them by the
trebin task, the Flu...

1669

By: Jason Quinn

08/05/2009 11:22AM

psf matching and negative bits around...Started by:stinker, 05/01/2009 07:41PM
Hi all,

I'm using psfmatch -- pretty much out of
the box, which is likely to be the
problem.

OK, I'm doing the obvious stuff, but
around my brightest stars, I get small
sections of negative values. They are
always offset from the centre of the
stars...

1673

By: raybutler

05/01/2009 07:41PM

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...

1674

By: Gaba_p

07/16/2009 11:05PM

Error in WAT of multispec headerStarted by:dr.michi, 01/27/2010 02:29PM
There is a bug in dispcor, which appears
if using more than one reference
spectrum, thus having more than one
dispersion function. There is no space
between the last coefficient of the
first function and the weight value for
the next function. This is n...

1678

By: pskoda

01/27/2010 02:29PM

Changing apertures in FXCORStarted by:rohit, 04/13/2010 08:12PM
I am using an echelle spectra.

Is there a way to change apertures in
FXCOR interactively? Like the way you
change the fitting function by typing
:func center1d

Doing a "?" in the interactive window
gave me a the following keyword:

:apertures

I ...

1680

By: rohit

04/13/2010 08:12PM

Problem when using <msctpeak>Started by:Jun Xu, 06/10/2011 04:29AM
Hi all!

I've been troubled by a problem when I
use the command <msctpeak> to
update the WCS. The parameters are
setted as below.
---------
mscred> mscfinder
mscfinder> epar msctpeak

I R A F
Image Reduction and Analysis
F...

1682

By: valdes

06/10/2011 04:29AM

Addstar outputing wrong coordinates.Started by:khl, 06/01/2009 02:47PM
Hi,

When I try to use tvmark to circle the
stars I have added to the image via
addstar, the circles that correspond to
the coordinate file produced by addstar
does not line up with the actual
location of the stars on the image.

Any help would be gre...

1683

By: khl

06/01/2009 02:47PM

Setting b_sampl in doecslitStarted by:jsmoker, 09/15/2008 08:38PM
Hello,

I often use doecslit within
noao.imred.echelle in order to reduce my
echelle data. What I would like to know
is how to set a background region
a-priori i.e. without using the 'b' key
once I am running the package (or A,b to
set all background a...

1683

By: valdes

09/15/2008 08:38PM

The syntax error: **: }Started by:cosmologist, 01/24/2011 03:40PM
Does anyone know what this syntax error
might mean?

[code:1:988210480c]
** Syntax error, line 1315
**: }
[/code:1:988210480c]

It says line 1315, but how do I know
which file is that?

1684

By: cosmologist

01/24/2011 03:40PM

Daophot/PSF problemStarted by:jimbojones, 09/27/2008 08:04PM
I have a quick search and can't seem to
find anything like the odd problem I am
having with the PSF task in daophot.

Initially I was trying to create a PSF
from 500 stars which I had done fine at
work using PYRAF. Having finally got
IRAF working on my...

1684

By: fitz

09/27/2008 08:04PM

Spectral flux calibration problemStarted by:garfield, 09/29/2008 07:07AM
Hi, we're having a problem with flux
calibration of our spectra.

When we try to follow the standard
routines described in the Users guide to
Reducing SlitSpectra with IRAF we get a
divide by zero problem, because the
telluric absorption features on the...

1686

By: valdes

09/29/2008 07:07AM

imlintranStarted by:dbrenner, 03/14/2009 03:45AM
When I use imlintran, it prints out
values for xshift and y shift. It seems
that the images are shifted by that
amount. How to I keep the magnification
centered around the origin, likewise for
magnify?

1689

By: fitz

03/14/2009 03:45AM

photcal fitparams fitting problemsStarted by:sochuwing, 09/27/2009 06:56AM
Hi all,
I have a question on
[i:65521dda10]fitparams[/i:65521dda10]
task in
[i:65521dda10]photcal[/i:65521dda10]
package.
I am doing BVR CCD photometry on Landolt
standard fields. I carried out aperture
photometry using
[i:65521dda10]phot[/i:65521dda10...

1690

By: sochuwing

09/27/2009 06:56AM

iminsert in scriptStarted by:dbrenner, 09/12/2009 05:40PM
You would think at least one of these
syntax would work. The program "runs"
but produces no output; I can use
iminsert from the command line with no
problem.

procedure preparetofft
begin

#iminsert (input1 = "zeros.fits", input2
= "test.fits[1:125,1:1...

1690

By: dbrenner

09/12/2009 05:40PM

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