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Aperture and area in PhotStarted by:RMendez, 10/22/2010 03:35PM
I am using noao/digi/daophot to do
aperture photometry.

In photpars I set the aperture to a
given radius.

I do phot on an image, and in the output
photometry file there is an entry for
"AREA". In general, it is quite close to
PI x Radius^2, but not ex...

1533

By: fitz

10/22/2010 03:35PM

Aperture photometry done, what now...?Started by:AnTaR3s, 12/12/2009 04:24PM
Hello everyone.

I've recently done some observations and
I#m trying my luck with aperture
photometry in IRAF. I've managed to get
a full list of my measurements, which
looks something like this:

#N IMAGE ID XCENTER
YCENTER ...

3491

By: fitz

12/12/2009 04:24PM

APEXTRACT ExamplesStarted by:fitz, 06/19/2018 09:16AM
[color=red]]Moderator's Note: Forwarded
from story submission][/color]

Hi,

I am new to using IRAF for aperture
extraction. Does anyone know of any good
examples to show how to use the
apextract tasks in the noao package? I
tried using the help fe...

1932

By: fitz

06/19/2018 09:22AM

apextract with more than 1000 aperturesStarted by:kanaan, 12/01/2011 06:23PM
hi All,

I am using apextract for IFU spectra.
We have 1300 fibers. I get the
keywords:

APNUM###

there is only three digits. In my case
it goes all the way to APNUM999

actually if I look at apertures around
100 I see:

APNUM100= '1009 1009 3098.03...

1595

By: valdes

12/01/2011 06:23PM

apflatten problemsStarted by:tsergori, 08/14/2007 05:52AM
Hi IRAF gurus

I am trying to use apflatten
(imred.ccdred.echelle) to produce a
normalised flat field for echelle
spectra. The CCD has 20 or so
"glitches". Two are shown in the image
below. These glitches have fewer counts
than the surrounding pixels. T...

3382

By: valdes

08/14/2007 05:52AM

apflatten with varying fit parameters...Started by:dr.michi, 05/16/2007 12:19PM
I noticed that on our flat fields it
would be nice to have a lower order fit
in one part of the spectrum (the
fringe-plagued red part), while on the
rest a higher order would be nice.

Is there any way I can do this in an
automated manner?

Michael

2887

By: dr.michi

05/16/2007 12:19PM

Appending a file extensionStarted by:massey, 04/26/2006 06:53PM
Hi, Mike et al:

I'm experiencing a slightly weird
problem: I have a set of files with long
wacky names like
s73475g0.5m15z-0.75t2.0.spec
s73500g0.5m15z-0.75t2.0.spec
s73525g0.5m15z-0.75t2.0.spec

It seems as if anything I do to try to
change the end o...

3295

By: fitz

04/26/2006 06:53PM

appending to a metaplot file in stsda...Started by:massey, 05/15/2006 08:54PM
Maybe this is a question for the boys
& girls at STScI, but my reading of
the
"igi" help pages makes me suspect that
whoever wrote this was just unfamiliar
with iraf command syntax. (They were
certainly unfamiliar with how to
construct a useful help...

3765

By: massey

05/15/2006 08:54PM

APPHOT Bug under PyrafStarted by:fitz, 05/12/2014 04:22PM

[color=red][Moderator's Note: Forwarded
from story posting][/color]

qphot outputs an invalid floating-point
number (such as "-299866.375-58") when
the coordinates of the object to be
measured fall considerably off (>= ~100
degrees) the FITS ima...

1134

By: iaa

05/22/2014 02:15PM

APPHOT/DAOPHOT ProblemsStarted by:Jason Quinn, 04/29/2007 09:48PM
I'm running 2.12.2a on a machine and I
just tried using APPHOT/DAOPHOT on it
and I'm get problems I've never seen
before.

The first one is that the automatic
"coo" and "mag" suffixes from daofind
and phot, respectively, get added to the
whole filename ...

3815

By: Jason Quinn

04/29/2007 09:48PM

aprecenterStarted by:caldwell, 02/14/2014 09:32PM
Hi,
I'm having troubles with an existing
script, and have tracked it down to
using aprecenter on some multifiber
spectra. I have a reference aperture,
called apref_DOME_2x3, and an image
which has been run through
apall once, called DOME. The ide...

1275

By: caldwell

02/19/2014 03:50PM

Apscatter for long-slit spectroscopyStarted by:jchavez, 01/28/2011 08:03PM
Hi,

I would like to subtract scattered light
across the dispersion (not necessarily
[i:79ec690410]along[/i:79ec690410] the
disperson, although that wouldn't hurt).
I have 3 stars in the slit. When I
extracted the spectra, I got 3
apertures.

I'm tr...

1506

By: valdes

01/28/2011 08:03PM

apsum definitionsStarted by:massey, 05/21/2010 10:03PM
Hi, Frank et al---

I'm in the process of measuring the Kitt
Peak sky brightness (20 years and
counting...) and I just want to make
absolutely sure that I understand the
number of pixels in my aperture using
APSUM. I have an upper limit of +20 and
a lo...

1422

By: fitz

05/21/2010 10:03PM

APSUM error Started by:ham, 06/19/2021 09:18PM
Running iraf 2.16.1-2018.11.01 on a
linux64 machine.

Desire: Reducing data from a Fiber
Spectrograph

Step 1) apsum from apextract pkg is run
on a flat-field image. This image is
designed to permit the determination of
the location and shape of ea...

1719

By: valdes

07/19/2021 11:00PM

apsum. Width of profileStarted by:azastro, 04/26/2007 08:34PM
Hi, all!

I don`t understand how it work.
I start
> [b:eb40043cc6]apsum[/b:eb40043cc6]
myfitsimage background="none"
pfit="fit2d"
and extract my spectra. but I need know
a width of profile for every wavelentgh.
(to control it for strong line)
How...

3639

By: azastro

04/26/2007 08:34PM

artdata.mknoise task gives low values...Started by:karsten brogaard, 01/26/2007 02:39PM
Hi,

I have tried to use the task
artdata.mknoise to add poisson noise to
my images. But for all pixels which are
saturated in the original images (value
= 65535) I get very low values
(~10-100)? Why is that?

Karsten

3931

By: fitz

01/26/2007 02:39PM

asthedit and lst/airmass not being ca...Started by:mikesdbv, 06/23/2014 03:17PM
I am having a bizarre problem. I am
calculating lst and airmass using
asthedit and I've found an instance
where it doesn't seem to be working
correctly, yet I can't figure out why.
This will be long, as I try to be
complete.
First, the raw header...

1047

By: fitz

06/23/2014 09:23PM

Asthedit and sexstrStarted by:IanWaite, 06/03/2009 06:02AM
Hi,
I have, in my fits header, a keyword
"UTC-OBS". The format in this keyword is
##:##:## If I use asthedit to write the
information into another keyword (to be
passed into a completely different
script), such as "UTSTART", I use
UTSTART = sexstr(@'UTC...

3547

By: IanWaite

06/03/2009 06:02AM

asthedit problemStarted by:JediWill, 06/28/2006 08:48PM
Hi everybody,

I am trying to update the headers of my
image files with asthedit. I am using a
.cmds file. The problem I am having is
that I am getting a syntax error when I
try to run it. I have V2.13 installed.
The weird thing is that when I use a
sch...

5058

By: fitz

06/28/2006 08:48PM

Astro::IRAF::CLStarted by:tgbotg, 11/13/2007 06:19AM
Does anyone here use Astro::IRAF::CL? I
tried using the CPAN forum for that Perl
module without any replies. Here's what
I posted on that forum:

[quote:b1429b1c65]
Any ideas on why I can't create a .coo
file from daofind or a .mag file from
phot? I'v...

8993

By: fitz

11/13/2007 06:19AM

astrometric image shiftsStarted by:mdg, 03/25/2008 12:50AM
Hi,

I have a simple problem: I have two
images from the same instrument of two
adjacent fields which overlap slightly.
Each image has a WCS in the header.
There are about 20 objects detected in
the overlap region, so I have x,y,ra,dec
for these objec...

1951

By: valdes

03/25/2008 12:50AM

astrometry problem on CTIO Mosaic dat...Started by:, 04/26/2006 04:40PM
Hello,

My Mosaic data taken from CTIO-4m on
2004 and 2005 seem have astrometry
problem. MSCCMATCH seems run ok through
them and the rms is less than 1.
But be dithered images could not be
stack well, especially at the center of
the image. By examinin...

3862

By: ping

04/26/2006 04:40PM

astrometry with MSCREDStarted by:Guest, 10/13/2005 09:48PM
[b:e48ce6ea01]From: [/b:e48ce6ea01]licia
troisi <troisi@mporzio.astro.it
([email]troisi@mporzio.astro.it[/email])>
[b:e48ce6ea01]Date:
[/b:e48ce6ea01]September 27, 2005
7:42:35 AM MST
[b:e48ce6ea01]To:
[/b:e48ce6ea01]fvaldes@noao.edu
([email]fvald...

3801

By: Guest

10/13/2005 09:48PM

astutil and artdataStarted by:dbrenner, 09/13/2006 03:23PM
What site should I use to download these
packages?

thanks

5078

By: dbrenner

09/13/2006 03:23PM

Atomic data in STSDAS nebular packageStarted by:aturby, 12/18/2013 05:34AM
Is the atomic data current by default in
the newest versions of IRAF and STSDAS?

Specifically, the atomic data available
in the analysis.nebular package of
STSDAS. In this directory, the most
recent reference is from 2001, besides
one reference from...

1106

By: fitz

12/18/2013 06:34AM

Atomic Data in the nebular packageStarted by:shaw, 08/25/2008 04:51PM
A user recently posed some questions
about the STSDAS.nebular package:

[i:6d2f5cad78]Dear Sir,

I am currently working on the planetary
nebular density and temperature
diagnostics for our reseach objects. And
I am checking some IRAF nebular
routines, e...

2169

By: shaw

08/25/2008 04:51PM

atomic lines in stellar atmospheres?Started by:, 08/29/2008 12:01PM
Hello,

I would like to calculate equivalent
widths and relative abundances in
stellar atmospheres. I searched through
the help page above but only find
something for gaseous nebula that is the
"nebular" package. Are there any atomic
line lists that I c...

2563

By:

08/29/2008 12:01PM

autoidenify does not auto find featur...Started by:holt, 06/25/2009 03:34AM
Hi,

I am trying to have autoidentify run
automatically for our tests. There are
four features in my arc and I provided a
coordlist with wavelengths of said four
features. Initially autoidentify does
not find a solution; however, in
interactive mode, a...

1506

By: valdes

06/25/2009 03:34AM

autoidentify with non-linear dispersionStarted by:jacosta, 09/09/2009 01:32PM
Hi there,
I'm trying to set up a semi-automatic
wavelength calibration for near IR
spectra. The spectral formats are very
reproducible since the instrument is
based on grisms which produce only few
configurations. I mean the spectral
range and dispersio...

1882

By: valdes

09/09/2009 01:32PM

Automatic extraction with apallStarted by:mrtomppa, 01/13/2009 09:31AM
Hi,
I have a little problem using the
apall routine in e.g. the apextract
package. I want to extract spectra
automatically. This doesn't sound like a
big problem but I'm reducing
spectropolarimetric data and I have two
spectra in each image. I want to...

2168

By: mrtomppa

01/13/2009 09:31AM

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