Viewing additional CALSPEC data in ISIS

[Paul Luckas]

Has anyone successfully viewed additional CALSPEC profiles (available from http://www.stsci.edu/hst/observatory/crds/calspec.html) in ISIS?

I'm receiving the "not a valid 1D FITS file" message when I've tried to load a couple of examples.

Paul

[David Boyd]

The .fits file from CALSPEC will open in Vspec and you can save as a .dat. You might want to crop the wavelength range in the .dat file. ISIS will then open the .dat file.
Cheers,
David

[Paul Luckas]

Thanks David,

Still no luck I'm afraid. I'm trying to load HD160617 from here:
ftp://ftp.stsci.edu/cdbs/current_calspec

Paul

[Ken Harrison]

Paul,
Just tried to download the .fits file and got the error message that it wasn't a valid 1D fits file.......

[David Boyd]

Paul,

It seems there are different formats of .fits files in that directory. The files with filenames under the column headed STIS in the directory http://www.stsci.edu/hst/observatory/crds/calspec.html won't open with the process I suggested. However those under FOS and IUE seem to open successfully.

There are several CALSPEC star spectra in the database which downloads with ISIS. These begin c_.

Cheers,
David

[Andrew Smith]

In trying out IRAF I came across several issues with FIT files created by pro-software and "amateur" software. These included issues with date formats and the wide variety of allowed FIT formats the pros use.

I found tools on this site that let me look at the files https://fits.gsfc.nasa.gov/ and then I had to develop utilities using Python and the astropy.io.fits package.

I found the simplest way to get the relevant packages was to install anaconda from continuum analytics https://www.continuum.io/downloads.

Regards Andrew

[Paul Luckas]

Hi Andrew,

I have Anaconda installed and have run IRAF in the past, but was hoping to avoid turning this into a half day project

Sadly, most of the ISIS CALSPEC spectra are northern hemisphere centric, so I may well have to look at some alternative utilities.

Thanks for your input though,

Paul

[Paul Luckas]

A fix in the unlikely event that anyone is following this thread:

- Download and install Specview from http://www.stsci.edu/institute/software ... s_specview.
- Open the STIS CALSPEC or other troublesome FITs file.
- Save as a text file, edit, rename to .DAT, open in ISIS. Crop, save, etc.

Thanks to John S (via the BAA) and David Boyd for tips.

Paul