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Last Post

buying a mac laptopStarted by:duvall, 02/20/2014 08:58PM
I'm thinking of buying a mac laptop that
I would use to run iraf. Are there
minimum memory requirements to run iraf?
What works comfortably? Macbook Air or
Pro?
Thanks.
Tom

895

By: fitz

02/20/2014 09:04PM

questions about findgainStarted by:oliver, 03/21/2014 08:17PM
Hi,

I used to use IRAF for reduction but
didn't use it for a long time. I have
noticed that the findgain task is moved
into obsutil package. Does this mean
that there is another task, doing
similar thing like findgain, which is
not obsolete?

*help...

886

By: oliver

03/22/2014 09:41AM

data typesStarted by:CosmicLettuce, 10/27/2014 12:49PM
I have a FITS file with the following
header segment:

% less section.fits
SIMPLE = T / file
does conform to FITS standard

BITPIX = 16 / Number
of bits per data pixel

NAXIS = ...

882

By: fitz

10/27/2014 03:34PM

MSCSETWCSStarted by:dopitz, 05/26/2016 07:05AM
Hello

I am trying to apply a WCS Database
(created by someone else) to other
exposures. I am doing:

mscred

for(i=1;i

881

By: dopitz

05/26/2016 07:05AM

Can't add headers to file using heditStarted by:e.longstaff, 09/10/2018 05:43PM
When I type this,

imutil> hedit myfile.fits
CUNIT1="Angstrom" add+ addonly+

I get this error,

ERROR: parameter `CUNIT1' not found

I've so far got around it by epar hedit
and setting add and addonly to yes but
this isn't a permanent solution....

875

By: fitz

09/10/2018 06:07PM

IRAF ExpressionsStarted by:blackhole612, 11/14/2016 08:02PM
Hello,

I am translating some IRAF code to
another programming language, but I
can't figure out this snippet of code
below.

n_expression="z"//n_i//"*(nclus=="//n_i//")+1000.*(nclus!="//n_i//")"
print(n_expression, >tmpexp)
tcalc(tmpall,"z"//n...

871

By: fitz

11/14/2016 08:52PM

iraf online task helpStarted by:harvester, 10/12/2016 03:12PM
hello, just wanted to ask about iraf
online help (html formatted). they
disappeared from both websites
iraf.noao.edu and iraf.net at some point
and i found them very useful, because of
their much better readability than
classic help and xhelp. is it pea...

856

By: harvester

10/12/2016 04:53PM

Streaks on image after geotranStarted by:dantes, 04/18/2017 06:11PM
Hi, I'm new to IRAF and I've run into a
bit of a problem. I'm geotranning an
image against another, but whenever I do
it comes out with these awful streaks
which are quite annoying. I've tried
messing with the value for "boundary"
and the value for "con...

848

By: valdes

04/25/2017 09:39PM

SAOImageDS9 version 8.0rc6 is now ava...Started by:joye, 10/22/2018 03:37PM
SAOImageDS9 version 8.0rc6 is now
available for download. Please use this
version or version 7.5 with IRAF.

http://ds9.si.edu/site/Beta.html

845

By: joye

10/22/2018 03:37PM

CanStarted by:massey, 03/09/2019 10:45PM
Hi Mike et al---

I've come across about dozen ancient
IRAF images (IIDS data) that are still
in the "imh" and "pixels" form. The
weird thing is that although I can see
them find with an ls, imhead says it
can't open the file. I could understand
it ...

837

By: fitz

03/11/2019 02:10AM

RGB Fits image reduction with iraf?Started by:ambrosc, 05/31/2018 11:55AM
Hi,

I got an observation run from a friend,
who tested his new SBIG STL-8300c
camera. It's the same camera like the
ST-8300m but with the color chip.
I got bias frames, flats and darks but
I'm not sure if I can do the reduction
in the same manner l...

836

By: ambrosc

06/05/2018 01:01PM

broken imdelete Started by:kanaan, 06/19/2016 03:34PM
hi Guys,

I am sure this must be really stupid, I
have been fighting this since yesterday
though.

I cannot imdelete files in my system. I
was just using !rm instead, but within
mscred some of the scripts run imdelete
then I cannot circumvent the ...

833

By: kanaan

06/20/2016 12:00PM

Which precession model?Started by:Sergei Schmalz, 01/17/2016 10:45PM
Hello!

Which precession model is used by the
'precess' task of the 'noao.astutil.'
package? If it's the one suggested by
the IAU in 1984 (based on IAU 1976
system of astronomical constants), then
are there any plans to replace it by a
newer model IAU...

830

By: fitz

01/17/2016 10:58PM

problem with imshiftStarted by:taylor, 07/21/2017 12:22AM
Hi all,

I have troubles after running imshift on
my images. I shift my images using a
file containing shifts and I have tried
different options for the parameter
"interp". Then I compare the initial and
the shifted image. The count value on
differen...

829

By: taylor

07/21/2017 12:22AM

n2gaussfitStarted by:sscibell, 09/25/2015 10:35PM
Hello,

I am new to using the n2gaussfit task
and I was wondering if, for example, if
when you type the command:

n2gaussfit image.fits[134:153,367:409]
out.dat

Is it creating a 19x42 box to then fit a
2D Gaussian to? So do the Xcent and
Ycent va...

825

By: fitz

09/29/2015 05:32PM

Bus error when attempting to run Started by:leonard, 10/14/2013 07:11PM
Hello,

I have a Macbook Pro Retina 15" with
an Intel Core I7 ("Mid 2012"), 64-bit,
with IRAF v. 2.16 installed. When I
attempt to run the fitparams task (in
the noao.digiphot.photcal package) it
exits immediately with:

ERROR: bus error

From ...

825

By: leonard

10/14/2013 07:11PM

FITS kernelStarted by:shaw, 12/21/2015 10:52PM
I'm trying to select FITS MEF files
based upon information that is split
between the PHDU and the HDUs. For
whatever reason, the file from the
(Gemini) archive has INHERIT=F. I
thought clever use of FITS kernel
features would allow me to use hselect
to ...

820

By: fitz

12/22/2015 03:10AM

No command line for xgtermStarted by:JoshuaJoseph, 04/30/2016 04:40AM
I have installed IRAF on Mac (I needed
to disable the SIP firstly to allow
mkiraf to install the iraf.h file in
/usr/include/) and when I open an xgterm
and 'ecl' to open IRAF, I get this
window:

[img]/Users/joshuajd/Desktop/iraf_screenshot[/img]
...

818

By: fitz

05/05/2016 10:21PM

imstack for different galaxiesStarted by:michgradstudent, 06/30/2016 04:30PM
I want to stack 50 different galaxies on
top of each other, each having different
central coordinates and in very
different parts of the sky.
I'm trying to calculate the cumulative
light from all of them, and stacking is
a nice way to do this.

Is th...

817

By: fitz

07/09/2016 03:36AM

chpixtype questionStarted by:massimo55, 03/04/2015 05:52PM
Hello,
I have a problem converting pixel type
from “real” to “ushort”.
I am working on images that originally
were in MEF format, and that were
converted with WFIT command in single
images with pixel type “real”.
I would like to convert ...

796

By: massimo55

03/04/2015 05:52PM

SAOImage DS9 7.4b7 is availableStarted by:joye, 09/23/2015 04:43PM
SAOImage DS9 7.4b7 is available at
http://ds9.si.edu/site/Beta.html.

This version contains a number of bug
fixes addressing issues with IRAF. In
particular, a problem with imexamine
introduced in earlier beta versions has
been corrected.

Regards
...

795

By: joye

09/23/2015 04:43PM

dispersion axis in iraf of UrekaStarted by:haha, 07/06/2015 11:52AM
It seems there is no effect if I use
noao.twodspec
apextract
apextract.dispaxis=2
when the dispersion axis is along
columns.

I am using IRAF in Ureka.
How to set the dispersion axis exactly?

792

By: haha

07/06/2015 12:53PM

arc/standard star/object comsbination...Started by:haha, 07/10/2015 09:22AM
Hi all,
If there are two different exposures
along two different columns for one
object, one has to process them
independently, and at last combine the
two spectra to remove cosmic rays?

If arc lines are taken independently,
for example, He/Ne/Ar ar...

790

By: haha

07/10/2015 09:22AM

Help with a simple zerocombine scriptStarted by:tasso1db, 07/22/2016 05:38PM
Hello,

I am trying to write a very simple
reduction pipeline for my schools
observatory. However I am getting the
following error: "Too many positional
arguments for 'zerocombine'" on line 12.
I'm slightly confused as to how I could
have too many ar...

788

By: fitz

07/22/2016 05:45PM

Stop querying for hidden and defined ...Started by:eggles, 07/31/2018 06:49PM
Hi,

I have a problem while running the task
'phot' where I am unable to run the task
without being queried/prompted for
parameters. My goal is to be able to
run this task (preferably through a
python script using Pyraf) as part of an
automated seque...

787

By: eggles

08/02/2018 08:16AM

ds9 and disappearing imagesStarted by:dah@lowell.edu, 06/27/2014 04:23PM
My student and I have been trying to
make color images with ds9, something I
have done successfully in the past. We
click on "new rgb" and load in the three
images one by one. But then when we go
back to look at the previous images we
loaded, one or mo...

781

By: fitz

06/28/2014 01:14PM

SAOImageDS9 version 8.0rc2 is now ava...Started by:joye, 09/04/2018 08:23PM
SAOImageDS9 version 8.0rc2 is now
available for download. Please use this
version or version 7.5 with IRAF.

http://ds9.si.edu/site/Beta.html

761

By: joye

09/04/2018 08:23PM

Problems with lists and "//" operatorStarted by:alba.aller, 05/08/2018 04:22PM
Hi!

I am trying to use the "//" (operator)
to prepend a new letter to an already
existing name but, for some reason, it
doesn't work for some time now. This is
what I am doing (with the error I get):

imred> imarith @all.list -
master_bias.fits b//...

754

By: alba.aller

05/09/2018 01:07PM

IRAF host scripting fails with segmen...Started by:mcba, 09/17/2018 07:31AM
Hi guys,

I'm trying to use an IRAF command in a
bash script, so I am creating a file
like this:

#!/home/mcba/miniconda3/envs/iraf27/iraf/bin.linux/ecl.e
-f
task $hello=/home/mcba/iraf/hello.e
imhead g.fits
hello
logout

When I run this, the ...

753

By: mcba

09/17/2018 10:55PM

fields task keeps asking Started by:Gaba_p, 11/04/2016 09:35PM
I can't seem to be able to run the
'fields' task without it asking me to
input the 'Fields to extract'.

This happens even with mode='h'.

Example:

ecl> fields.mode='h'
ecl> fields.fields='1,2'
ecl> fields.lines='1'
ecl> fields.files='test.dat...

751

By: fitz

11/14/2016 05:20PM

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