Questions tagged [fits]
The fits tag has no usage guidance.
34
questions
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Plotting scatter graphs with fits binary file?
Basically I'm trying to create code in python which will allow me to open a Fit's binary file, read it and create a scatter diagram with it. Hopefully plotting LogG vs Teff. But it seems like ...
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34
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Crop a FITS file in shape of another
I have a FITS file, let us say file A. I have another FITS file, file B. File B has a smaller footprint than file A. I want to crop file A in shape of file B. How do I go about doing that?
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30
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CMB maps analysis (Planck, ESA, FITS)
I wanted to analyze Planck mission FITS files and was wondering about the parameters. So the map uses color coding for temperature-based anisotropies right? So the maximum angular resolution is ...
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Not finding some FITS Spectra files in SDSS
I'm trying to automate downloading FITS files from SDSS. Currently, I'm getting information on the plate, mjd, and fiberID of certain objects from an SQL query on SpecObj, which I'm using in an url ...
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35
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ds9 configuration issue
I'm trying to use DS9 for X-ray image analysis. Before that I have to configure it for use, I need to click on option using web proxy.
Beside use internal web browser checkbox there should be another ...
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55
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Creating a small data pipeline
I wanted to create a small data pipeline such that it consists of images of sky in the filters F125W, F160W, F606W and F850LP. The 4 images for a single object should be in a single FITS File which ...
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113
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Plot several FITS files in one graph
At the moment, I get three separate graphs. Ideally I would like to overlay all graphs, so that I only have one plot with multiple FIT files.
I have a folder on my desktop with the HARPS-N data, the ...
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129
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Split Multi-Extension fits file - fits.fz format
I have CFHT/MegaCam fits.fz file on which I want to do photometry. I want to split these large fits.fz file into separate CCD detector fits and then run Source Extractor on them for photometric ...
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238
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What do the negative values in FITS images mean?
I am using FITS images, and noticed negative values in value matrix. What they mean? For example, for one of the images, the minimum value is -0.34472656 and the maximum = 552.0. The data type(format) ...
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28
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How to reproject a fits file using MontagePy
I am fairly new to image reprojection so I am trying to use MontagePy to go from a bigger fits file to its smaller subsection (which is in a different observation, therefore header) but the output ...
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2
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263
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Making RGB image using FITS files with different dimensions
I want to make an RGB image using 3 FITS files: one IR image from Spitzer and the other two from UVIT. I tried to make them using make_lupton_rgb in Astropy, but it doesn't work in the case of FITS ...
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332
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How to slice WCS in a FITS file?
I have three WCS axes in a FITS image. I want to slice the axes and use only the first one. Note that though there are three axes, the WCS is superimposable. So there is no worry about a shift in WCS ...
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3
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44
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Frequency coverage for first spectral channel of .fits cube?
A .fits cube has 3 dimensions, where the 1st axis is RA, 2nd axis is Declination and 3rd axis is frequency.
My question is rather simple, but causing pain none-the-less. Given a .fits cube, what is ...
- 257
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63
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What do negative values on bright sources in TIRSPEC mean?
I opened a FITs image data from TIRSPEC (NIR imaging) (an HgCdTe infrared imaging sensor) on DS9 and I saw that some of the bright stars have black patches at the center (negative values).
Can you ...
- 503
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59
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Where does FireCapture save FITS photos during recording?
I made a lot of FITS photos yesterday and accidentally the laptop battery was discharged and it was turned off before I pressed the stop button. Now, I don't see that last session in folder with other ...
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101
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Why does the same file differ so much in size between FITS / CSV / ECSV formats?
Maybe this is obvious for some people but I'm a newbie when it comes to working with astronomical data. I have the same catalogue in different formats and am a bit surprised as to how sizes change. ...
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How can I use the "stiff"(the library from this site; astromatic.net). I can not escape from the error[*Error*: no 2D FITS data in <MY FITS FILE>]
I try to use "stiff" library now.
This library is from astromatic.net
I follow the tutorial's example1(page 18), but It is not worked.
...
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35
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Can't read documentation in pow, launched form fv: Error: can't read "env(POW_HELPDIR)": no such variable
I'm launching the pow tool from fv version 5.5, installed via apt on Ubuntu 20.04.
It is part of HEASoft's FITS software suite.
...
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3
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106
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What's mean of the "FITS BLOCK"?
I am studying FITS file, through this: Definition of FITS
They said Fits block is like below(page3).
A sequence of 2880 eight-bit bytes aligned on
2880-byte boundaries in the FITS file, most commonly ...
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35
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uvotdetect sometimes doesn't make valid .fits files for DS9 to read (Swift UVOT, Heasoft)
I have downloaded galactic center sky images from the Swift database (https://www.swift.ac.uk/swift_live/index.php#doSimpleSearch.php?catname=swiftmastr&searchpos=galactic+center&searchrad=10&...
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22
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How to choose numeric precision when creating a file with STILTS?
I am using the STILTS command-line tools, popular in astronomical data processing, to merge many (~330k) .fits astronomic tables into 1 large table. I am doing this with the STILTS command in the ...
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619
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How to quickly loop through many small fits files for data analysis?
I need to extract information from a few columns in ~20k different fits files with python. Each file is relatively small, ~0.2MB. I have been doing this so far with a loop and ...
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66
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How to superimpose an optical image upon a radio contour image using AIPS?
I am using AIPS by NRAO. I am trying to overlay a radio contour image with an optical image in the r-band. From the cookbook I could not find the suitable command for it. Both are fits files pf course....
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92
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Frame used for RGB cube in SAOImage
I have RGB FITS images with NAXIS=3 so I read them into SAOImage (ds9 8.2.1). I use this command line:
$ ds9 -rgbcube myimage.fits
Doing so, the window is split in ...
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79
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healpix: creating isometric tiles for flat map of survey
I am currently tasked with creating a visual of a recently completed survey which is in HEALPix1 format. I am also required to use the DSS and Planck skymaps also in HEALPix, and would like to flatten ...
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68
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.fits Files for Exoplanets
I am learning to use AstroImageJ software. And using this software to plot transit graph for Exoplanet orbiting the star. I want to know from where can we find the .fits file of target star ? I tried ...
3
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253
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Finding galaxy spectra in SDSS Catalog by object name
I am looking to find galaxy spectra of early type elliptical galaxies in the SDSS catalog by the objects name. See: https://dr12.sdss.org/advancedSearch. I dont know how to find out the PLATEID of my ...
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working with stellar spectra in fits format in python
Hey I am new to working with astronomical data in Python. I wanted to start working with stellar spectra and I am having trouble with the data. To get a first look I just wanted to plot a spectra (...
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4
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382
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Algorithm to fit galaxies
Do you know of any other data analysis algorithm that fits 2-D analytic functions to galaxies and point sources directly to digital images, other than GALFIT? Especially to subtract lens light from ...
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584
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Issues in dimensions and slicing while plotting contours over a FITS Image in Astronomical Plotting Library in python (APLpy)
I have been trying to plot the contours of a FITS image over itself in APLpy. The image was created in AIPS, and has dimensions (1024,1024,1,1), viz., right ascension (RA--SIN), declination (DEC--SIN),...
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30
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superimpose borders of several FITS on the sky map
I have several FITS files with correct WCS info (as far as I know) and want to project them or preferably their borders only in the same sky projection, so it will be easy to understand an actual ...
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269
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How can I create a mask for a fits image?
I need to create a mask of a fits image.
By this I mean that I want to create the image that covers all secondary objects from the original image except the one is in the center.
I have some routines ...
2
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2
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155
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How to invert fits headers order (primary/secondary)?
I have an image from Hubble telescope with two headers and this creates a problem because my program expects the NAXIS, NAXIS1, NAXIS2 in the first header, but in this image case, this info is in the ...
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How can I crop a fits file and get correct WCS header info without a new plate solve and WITHOUT USING PYTHON?
While my question is similar to this one, the suggestions offered there won't work for my specific situation. For over a month I've been trying to find software capable of this but it's been an ...
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