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    Ronny Pfannschmidt
    @RonnyPfannschmidt
    so from my pov there is going to be some back and forth to sort out the comprehension and and the future direction
    ASMIT SINGH
    @asmitks
    Hello! This is Asmit singh . I am a CSE undergrad from IIITD . I would like to contribute to open astronomy and Pyastro as part of GSOC 2019. Please let me know some issues to get started.Thank you
    _
    matrixbot
    @matrixbot
    lbracher on Freenode HI there! I would like to know if it's possible to calculate the next perigee of an artificial satellite using its TLE and astropy. Do you know how to do that? TIA!
    Ghosha
    @gekaremi
    Is there an easy way to make the coordinate (angle) periodic (2pi)? This is a pendulum-like problem, and with some parameters at some points in time the body rotates, and with some it only librates/swings
    It is clear that it is possible to apply mod2pi to a solution, but this is not always convenient.
    matrixbot wildlander on Freenode says goodbye: see you in the next! o/
    matrixbot
    @matrixbot
    kerel on Freenode lbracher: I can recommend the method twoline2rv from sgp4 to read the TLE and then skyfield, poliastro or sgp4 to propagate around the orbit. To determine the perigee you could then use the optimization functions from SciPy. I don't think there is a method which directly returns the next perigee.
    matrixbot
    @matrixbot
    lbracher on Freenode kerel, thank you! I'll try those!
    matrixbot
    @matrixbot
    kerel on Freenode lbracher: Here is an example for propagation with sgp4: https://gitlab.com/kerel-fs/jupyter-notebooks/blob/master/beresheet/Beresheet.ipynb
    kerel on Freenode If you implement a method for next perigee I would be interested as well (might use it to follow Beresheet :D).
    kerel on Freenode (only cell In[9] is relevant here)
    matrixbot
    @matrixbot
    lbracher on Freenode kerel, thank you! :)
    Ghosha
    @gekaremi
    oh sorry, the past message was meant for another chat.
    matrixbot
    @matrixbot
    mithrison on Freenode hey
    mithrison on Freenode what’s exactly this framework for?
    matrixbot
    @matrixbot
    SuperMcFreaky on Freenode Hi All. I've got a question about handling FITS files with io.fits
    SuperMcFreaky on Freenode Is there a way to convert a PrimaryHDU object to an ImageHDU object?
    SuperMcFreaky on Freenode I can do i = fits.ImageHDU(primary.data, header=primary.header)
    SuperMcFreaky on Freenode and that works, but it copies the data into memory, which can be a real problem in my case
    matrixbot
    @matrixbot
    astrofrog (@slack_astropy_U07529085:openastronomy.org) Just to check, why do you need to do this?
    matrixbot
    @matrixbot
    SuperMcFreaky on Freenode I have a large collection of single-HDU FITS files that get collected into a custom data object
    SuperMcFreaky on Freenode for debugging purposes it is sometimes useful to write this aggregate object as a single FITS file
    SuperMcFreaky on Freenode and an HDUList with all PrimaryHDUs produces a non-compliant FITS file
    SuperMcFreaky on Freenode it won't even write unless I set output_verify='ignore|warn" in the call to .writeto()
    astrofrog (@slack_astropy_U07529085:openastronomy.org) interesting, I would have thought an HDUList of PrimaryHDU would do the right thing
    astrofrog (@slack_astropy_U07529085:openastronomy.org) it might be worth opening an issue in the GitHub repo to ask whether astropy could be smarter about auto-converting to ImageHDU when writing, we definitely shouldn't be writing files that don't comply with the standard
    astrofrog (@slack_astropy_U07529085:openastronomy.org) I'm not sure how to avoid the copy, if you join the astropy Slack team there is a #fits channel where you could ask
    SuperMcFreaky on Freenode well, it won't do that unless I tell it that I'm OK with a non-standard file
    matrixbot
    @matrixbot
    SuperMcFreaky on Freenode ok, I had thought about opening an issue on GitHub but I figured I'd check here first to make sure I wasn't missing something obvious
    SuperMcFreaky on Freenode I feel like the capability should/could be there because io.fits already is really good about using memmap, etc.
    SuperMcFreaky on Freenode for example, if I open 1000 files with large ImageHDUs and put them together in a new HDUList and write that to disk then they data never enters memory
    SuperMcFreaky on Freenode which is exactly what I want, except for PrimaryHDUs
    saimn I don't think that the data is copied if it is a numpy array, but maybe it needs to be copied because it is memmmaped
    matrixbot
    @matrixbot
    @saimn:matrix.org was kicked by @appservice-irc:matrix.org ("30 day idle timeout.").
    Anne Archibald
    @aarchiba
    anyone have any idea why I might not be able to make files or directories readonly under CircleCI? It's 32-bit but it's Linux and I'm using chmod. (And it works on my machine and Travis Linux.)
    wait, is CircleCI running astropy as root? really?
    matrixbot
    @matrixbot
    Cadair (@cadair:cadair.com) yeah that's pretty common
    Cadair (@cadair:cadair.com) it's all containers in VMs etc
    Anne Archibald
    @aarchiba
    well that'll do it I guess. any good ways for root to temporarily make it impossible to write to a directory?
    matrixbot
    @matrixbot
    @cadair:openastronomy.org was kicked by @appservice-irc:matrix.org ("User has been idle for 30+ days.").
    matrixbot
    @matrixbot
    @slackbot:openastronomy.org was kicked by @appservice-irc:matrix.org ("User has been idle for 30+ days.").
    Santam Roy Choudhury
    @SantamRC
    Screenshot from 2020-01-18 01-12-45.png
    How to install astropy?... I am getting this
    matrixbot
    @matrixbot
    astrofrog Cadair: what's the URL for the openastronomy matrix server? (to log in to Riot)
    Cadair (@cadair:cadair.com) openastronomy.modular.im
    astrofrog I got logged out due to a corrupt session (think I ran out of disk space)
    Cadair (@cadair:cadair.com) oh 😕
    matrixbot
    @matrixbot
    Peanut on Freenode Hi everyone - I'm trying to plot a few stars, in RA and Dec. I keep running into how to initialize a useful WCS without having a FITS file. Does anyone have suggestions please?
    matrixbot
    @matrixbot
    @slack_astropy_U78DGPA6M:openastronomy.org was kicked by @appservice-irc:matrix.org ("User has been idle for 30+ days.").
    @slack_astropy_U7WT8K0BV:openastronomy.org was kicked by @appservice-irc:matrix.org ("User has been idle for 30+ days.").