Planet Hunters Talk

Accessing fits files for K2?

  • Ptd by Ptd

    Hi
    Been out of the game for a while and not wanted/needed to download a K2 fits file before though I was used to doing so in the old planethunters.

    And I'm struggling to find the data, for example where is the KID for Image APH0000t7f listed? it has a 2MASS id of 03431893+1901143 which is a search field at https://archive.stsci.edu/kepler/data_search/search.php but when I run the search I get multiple KIDs listed eg 757076, 757280, 891901 etc. all of which are from the dates K1 files not K2 files.

    What do the EPIC numbers listed in the descriptions refer to are they a new kind of KID?
    I found something I could access here https://www.cfa.harvard.edu/~avanderb/k2c4/ep210744182.html by pasting the EPIC id directly into the url but I'm not sure how to use the files that I found on that site as they are not in the format I am used to. I downloaded the .tar.gz file and managed to unzip it to a .tar file with 7-zip, but I'm left with a.tar file and I haven't so far been able to work out what I'm supposed to do with that.

    Sorry if I'm being daft and missing something obvious.

    Please help

    Ptd

    Posted

  • ajamyajax by ajamyajax in response to Ptd's comment.

    The KID to use in search is the EPIC no, for example 210744182. Yes they are a new kind of KID for K2 but you need to enter that in the "K2 ID" field in the K2 search here:

    https://archive.stsci.edu/k2/data_search/search.php

    Regarding FITS files though, wouldn't working with TXT files be easier? They aren't always available for K2 targets, but I would look for those first. Click or tap on "8" or a higher number in High-Level Science Products if it is available and you might find one there. I just checked and it is available for the 210744182 example you mentioned.

    Edit: if you insist on using FITS files, you can find software to help with that here:

    http://keplergo.arc.nasa.gov/DataAnalysisTools.shtml

    (or the newer link)

    http://keplerscience.arc.nasa.gov/software.html

    Hope this helps.

    Posted

  • Ptd by Ptd in response to ajamyajax's comment.

    Hi ajamyajax I have no particular affection for fits files I was only looking for them because that was how K1 light curves seemed to be available, if there is now an easier to use alternative, that would be great.
    I followed the link you kindly provided https://archive.stsci.edu/k2/data_search/search.php which lead me here
    https://archive.stsci.edu/k2/preview.php?dsn=KTWO210744182-C04&type=LC , which was offering me a fits file again, which while I know it was what I asked for, it sounds from your kind response like I might not have asked for the best thing, where can I get the TXT files?

    MT
    Ptd

    Posted

  • ajamyajax by ajamyajax in response to Ptd's comment.

    Well the good news is you are close. 😃 Back up from the screen you are on, then look in the far right for "High-Level Science Products." Then click or tap on "8" or a higher number there and you should see a list of files. The TXT file should have that extension if I remember right. From there you are on your own, but you might remove the two text headers describing the data because they are not both comma delimited if I remember right. Good luck!

    Posted

  • Ptd by Ptd in response to ajamyajax's comment.

    Yup found it now many thanks, the web page was wider than my PC screen and I hadn't realized Doh! Found the TXT file, much easier than working with a fits, and Open Office spreadsheet opened it fine without deleting anything. A bit of folding suggests this is an EB with a period of .382 days, but the LC is a bit of a mess, I think one or both of the pair are variables of some kind, but working things out beyond that ...

    MT
    Ptd

    Posted

  • ajamyajax by ajamyajax in response to Ptd's comment.

    Awesome, Ptd! I am glad it all worked for you.

    Posted