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negative magnitude in PHOTStarted by:nakisa, 11/15/2010 10:45PM
Hi, I have two questions about PHOT.
First , I am doing photometry on some
stars in M31. PHOT gave me -23 . I don't
know where this minus comes from!
second, how can I get error bar on the
magnitude value with PHOT?
Best,Nakisa

1217

By: fitz

11/15/2010 10:45PM

ERROR: MWCS: dimension mismatch (mw_o...Started by:rohit, 11/15/2010 09:26PM
I downloaded an HIRES file from their
archive. When I try to open it I get the
following errors:

ecl> imhead
HI.20080915.26299_2_10_flux.fits
HI.20080915.26299_2_10_flux.fits[0][real]:
object (Flux)

ecl> splot
HI.20080915.26299_2_10_flux.fits[...

5551

By: fitz

11/15/2010 09:26PM

rgbsun troubleStarted by:AndrewS, 10/23/2010 01:54PM
Hi all

I'm having trouble making an rgbcolour
image with rgbsun..
First thing is I have three images: _I
,_V and _B filters but when I try
rgbsun I am told that images must all
be of the same size.. images differ by
at most one pixel for given dimen...

1399

By: fitz

10/23/2010 01:54PM

Floating point overflow in continuumStarted by:sdb210, 10/14/2010 02:59AM
I'm using continuum to fit out the blaze
function in some echelle spectra. When
switching between certain apertures, the
task will crash and throw a floating
point overflow error. For some reason
my red chip data tends to go farther
before crashing (f...

1485

By: fitz

10/14/2010 02:59AM

no output file generated by photStarted by:findlay, 10/09/2010 08:07PM
Hello all,

I've been doing some aperture photometry
on some SDSS .fits frames using the
apphot.phot task in batch mode. I've
done this before on non-SDSS images and
never had any problems. As far as I can
tell the only difference between the
sdss and n...

1571

By: findlay

10/09/2010 08:07PM

Using fitpars in fxcorStarted by:sliss1, 10/07/2010 02:34AM
I am using fxcor to determine the radial
velocities of double lined spectroscopic
binary targets. Unfortunately, some of
the spectra are quite noisy. I would
like to use filtpars to filter out some
of the noise, but am not sure what
values to use for ...

1347

By: fitz

10/07/2010 02:34AM

reading very old iraf filesStarted by:Guest, 10/01/2010 09:18PM
Hello,
I am trawling through some very old 1-D
spectral data in the old iraf
format (.imh) that I have not looked at
for years.

I am finding that files generated in the
mid 90s, e.g. 1994,1995 cannot
be read by iraf tasks - at least not
those I have...

1056

By: fitz

10/01/2010 09:18PM

Database entryStarted by:Guest, 08/31/2010 06:29PM
Dear Sir:
Would you please entire our observatory
on your
database? Thank You.

observatory = "jcdo"
name = "Jack C. Davis
Observatory, Western Nevada College"
longitude = 119:47:26.4
latitude = 39:11:08.6
...

1077

By: fitz

08/31/2010 06:29PM

ModellingStarted by:Sparkles, 09/30/2010 04:44PM
Hi guys,

I'm trying to use splot to model some
double peaked spectra. there is really
not much info on this stuff. I've tried
using the d key to set the continuum
level and fit a Lorentzian function to
one of the two peaks. Is there any way
of telling...

1212

By: fitz

09/30/2010 04:44PM

Pixel Coordinates into Sky CoordinatesStarted by:zhengyi7, 09/30/2010 02:38PM
Hi All,

I'm fairly new to IRAF. Is there any
package in IRAF that I can use to
translate pixel coordinates into sky
coordinates (RA & DEC)? Any help
will be greatly appreciated. Thanks.

1351

By: fitz

09/30/2010 02:38PM

from counts to wavelength????Started by:Sparkles, 09/17/2010 03:29PM
Hi Iraf Gods,

I'm really new to Iraf (on placement),
and having some problems. I'm working on
a _x2d file and trying to extract the
spectra using apall, getting a plot and
everything's fine. However I need the
x-axis in terms of wavelengths not
counts,...

1388

By: fitz

09/17/2010 03:29PM

installing tables/stsdasStarted by:shinigami, 09/17/2010 01:36PM
Hi,
I try to install tables/stsdas on my
laptop but i have some problems at the
first steps. I have ubuntu 10.04 on
64bit machine. my csh.cshrc looks like:

setenv iraf ~/iraf/
setenv IRAFARCH linux
source $iraf/unix/hlib/irafuse...

1613

By: fitz

09/17/2010 01:36PM

tiltpars (fortran executable in iraf)Started by:ebubar, 09/14/2010 05:36PM
I wonder if anyone can help with this.
I am reducing some MIKE echelle spectra
using the mike_tools packages. I've
reached the point where I am correcting
for the tilt of the slit using a fortran
program called tiltpars. It is
compliled and I have li...

1158

By: ebubar

09/14/2010 05:36PM

imarith floating point invalid operationStarted by:GalacticKitten, 09/10/2010 08:14AM
I'm getting this error when I try to run
imarith on a set of 2min exposures I
have. The odd thing is that it works
fine for both 30sec and 60sec exposure
times of the same night.
I am trying to subtract the dark from
the light, and it comes up
ERROR: ...

1210

By: fitz

09/10/2010 08:14AM

imcombine offsets recognized but not ...Started by:mzagursk, 08/27/2010 10:13PM
Hey All,

I am running imcombine to stack/offset
many small images. It seems that no
matter what offset i choose (both
physical and wcs), it produces a file
with the correct header information
(naxis1 and naxis2) but when I open it,
it is simply the la...

2139

By: mzagursk

08/27/2010 10:13PM

Error for apallStarted by:cosmologist, 08/26/2010 10:07PM
when I run apall on my data I get the
error:

[code:1:360cb055f8]
Warning: No sample points for fit
Warning: No sample points for fit
Warning: No sample points for fit
[/code:1:360cb055f8]

What might the reason be?

Thanks

1306

By: cosmologist

08/26/2010 10:07PM

imsurfit 'hole'Started by:spacermase, 08/25/2010 04:56PM
Greetings all,

I'm currently doing photometry on some
images of Rhea, and I've been using
imsurfit to remove the gradient from
Saturn. It's been doing this pretty
well, but I've noticed that, after
subtracting the background away from the
image, frequ...

1578

By: fitz

08/25/2010 04:56PM

ds9 + imexamStarted by:afarrow, 08/25/2010 02:01AM
There seems to be a focus issue
occurring between imexam and ds9, I'm
checking here first before I pester the
guys over at ds9.

Problem:
display is issued in xgterm, ds9 opens
the image, imexam is issued, cursor
changes, and I click in the ds9 main
im...

1613

By: fitz

08/25/2010 02:01AM

temden not working for C III 1906,1909Started by:janerigby, 08/12/2010 09:40PM
Can anyone tell me how to get
stsdas.analysis.nebular.temden to
compute densities from the C III ratio?
It's working fine for the [O II] and [S
II] doublets. But for C III, I get
"Density calculation failed". Key pars
below. Thanks in advance for adv...

1258

By: fitz

08/12/2010 09:40PM

psfmeasure for multiple images with d...Started by:angus, 07/20/2010 09:15PM
Hi

I have to measure the PSF parameters of
stars in a large number of fits images,
each image corresponding to a different
stellar field. I know the pixel
coordinates of the stars on each field.
I am trying to use the psfmeasure task
for this job, runn...

2922

By: valdes

07/20/2010 09:15PM

ccdproc removing objects?Started by:spacermase, 07/14/2010 03:45PM
Hello all,

I'm hoping that is the result of a
simple mistake I'm making, but I've been
running ccdproc on a batch of images I
acquired. I created the flat and bias
images using standard protocol, and they
look normal. However, when I actually
run ccd...

1212

By: valdes

07/14/2010 03:45PM

how are poisson corrections calculate...Started by:eduardodelpeloso, 07/12/2010 12:21AM
Hi everyone!

I am trying to understand how the
sigclip algorithm in the
noao.onedspec.scombine task works,
because I am trying to implement it in
C.

If I understood it correctly, it works
more or less the following way:

0) Scale all spectra to a com...

1162

By: valdes

07/12/2010 12:21AM

stand-alone daophot iiStarted by:andres, 07/07/2010 04:08PM
We would like to compile the stand alone
daophot ii (Linux Mandriva) and Peter
Stetson suggested ut to get a 64-bit
version of IRAF/IMFORT from Tucson.
Could you send it to us?

Thanking in advances,
Andrés

2102

By: fitz

07/07/2010 04:08PM

n2gaussfit not fitting all parameters...Started by:ltacconi, 06/29/2010 11:45AM
Perhaps I'm doing something stupid, but
I'm having a problem with n2gaussfit in
that it doesn't seem to fit all the
parameters. Specifically, it seems that
FWHM, Ellip., and Theta remain constant
for all fitting that I do. Below you
will find my param...

2022

By: sscibell

09/28/2015 11:42PM

Phot/datapars/photpars etc.Started by:khl, 06/28/2010 07:00PM
Hi,

I'm currently looking at an image whose
units are in counts/sec. When I run the
task PHOT, it tells me that the
magnitude of the source is ~32nd
magnitude. This is understandable
because the units of the image is
counts/sec and that number very s...

1286

By: khl

06/28/2010 07:00PM

imcombineStarted by:dbrenner, 06/23/2010 05:34PM
How do I translate the cl command
imcombine *SR*.fits sum.fits

to a command in a script?

thanks.

1326

By: dbrenner

06/23/2010 05:34PM

objmasks on Multi-Extension mosaic im...Started by:hawcheng, 06/11/2010 03:30PM
Hi.

Trying to use objmasks on a
multi-extension fits file. But it won't
run. I can get it work fine when it's
just a plain fits file and not a MEF.
Very puzzled.

This is the output :

mscred> objmasks
List of images or MEF files
(BF_Leo_IV_I.095.O...

1357

By: valdes

06/11/2010 03:30PM

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...

1427

By: fitz

05/21/2010 10:03PM

ERROR: MWCS: dimension mismatch (mw_o...Started by:hplana, 05/08/2010 11:40AM
Hi

I am getting this mismatch type error
when trying to average GMOS IFU spectra
with "gscombine". Why IRAF is doing that
now and not previously remains a
mystery. As mention before on the forum
I tried to do a wcsreset image
wcs=world, but IRAF is gi...

1898

By: fitz

05/08/2010 11:40AM

Problems with the daofind taskStarted by:chloe, 05/03/2010 08:32PM
Hi,

I've got some problems with the daofind
task.
When I try to run it with the daophot
package, I have an error message like
"Error, floating point divide by zero".

But when I run daofind with the apphot
package (same parameters), It runs
perfectly. ...

1263

By: fitz

05/03/2010 08:32PM

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