4
2011-02-04
Blog: [Question] How to convert a HEALPIX image to e.g. CAR projection?
Question from user Christoph:
Does anyone know a command line tool or python module that can convert a HEALPIX FITS image to a projection like e.g. CARtesian or AIToff?
Aladin can convert to / from HEALPIX, but I need something non-GUI. As far as I can tell MONTAGE and SWARP can't handle HEALPIX, is that correct?
2
2010-10-26
Blog: [Question] Overplot multiple coordinate systems with Basemap
Astropython.org visitor Danny writes:
"I have a question maybe somebody in this community can answer regarding coordinate lines drawn by Basemap [within Matplotlib].
Does anyone know if its possible to draw onto a map, grid lines (meridians and parallels) using a different coordinate system. For example an astronomical image plotted in equatorial coordinates with galactic parallels overlain. I am particularly attached to Basemap for plotting as it ...
1
2010-09-27
Blog: [Question] period-finding packages in python
Tom asked:
"Hi, I have a question about period-finding packages in python. I know that in IDL the Lomb-Scargle periodogram is commonly used, and I am looking for an equivalent function from some package somewhere.
I've googled "Lomb Scargle python" (noquotes) and found a couple of possibly useful results, but nothing that was included in any of the modules recommended by this website (such as scipy).
Do ...
5
2010-06-07
Blog: Spectral analysis tools?
Kelle writes:
I'm looking for preexisting code to do two things:
1) given an observed spectrum and a filter profile, compute mags
2) given a spectrum and two wavelengths, measure equivalent widths of
absorption/emission lines. similar to the 'e' function in splot (IRAF).
Aldo asked:
"I am quite new to python and trying to convert my old IDL scripts. In particular I'm interested in cross-correlating source catalogs: is anything already publicly available on this problem?"
To get this started, I'll comment that I think the poster is looking for cross-correlation based on positional separation (match within 1 arcsec). I do not know of a full fledged script but among ...