Discussion topics for individual codes
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owlice
- Guardian of the Codes
- Posts: 1129
- Joined: Wed Aug 04, 2004 4:18 pm
- Location: Washington, DC
Post
by owlice » Tue Jul 27, 2010 1:52 pm
BHSKY: Visual distortions near a black hole
Abstract: BHSKY (copyright 1999 by Robert J. Nemiroff) computes the visual distortion effects visible to an observer traveling around and descending near a non-rotating black hole. The codes are general relativistically accurate and incorporate concepts such as large-angle deflections, image magnifications, multiple imaging, blue-shifting, and the location of the photon sphere. Once star.dat is edited to define the position and orientation of the observer relative to the black hole, bhsky_table should be run to create a table of photon deflection angles. Next bhsky_image reads this table and recomputes the perceived positions of stars in star.num, the Yale Bright Star Catalog. Lastly, bhsky_camera plots these results. The code currently tracks only the two brightest images of each star, and hence becomes noticeably incomplete within 1.1 times the Schwarzschild radius.
Credit: Nemiroff, Robert J.
Site:
https://doi.org/10.20356/C4NH21
https://ui.adsabs.harvard.edu/abs/1993AmJPh..61..619N
Bibcode:
1999ascl.soft10006N
ID:
ascl:9910.006
Last edited by
Ada Coda on Wed Nov 18, 2020 5:36 pm, edited 1 time in total.
Reason: Updated code entry. Code-seeking owl at your service
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distefanom
- Posts: 1
- Joined: Wed Jun 16, 2010 6:19 am
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by distefanom » Tue Dec 07, 2010 4:08 pm
If one could *REALLY* see the scene at the shown distance. I think could barely say "OMG" ! ! ! Since he/she would have NO time to say more, NOR could escape in any direction...
simply terrific... isn't IT?
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nealmcb
- Posts: 1
- Joined: Sat Sep 04, 2010 4:53 pm
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by nealmcb » Mon Jul 01, 2013 5:16 pm
Thank you!!
Most of the code seems to be in fortran. What version?
What language is the code in the ".pro" file written in?
Is there a makefile or set of instructions anywhere for compiling and running it? (E.g. on Ubuntu Linux?
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RJN
- Posts: 14
- Joined: Sat Jul 24, 2004 1:58 pm
- Location: Michigan Tech
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by RJN » Mon Jul 01, 2013 6:09 pm
nealmcb wrote:Thank you!!
Most of the code seems to be in fortran. What version?
What language is the code in the ".pro" file written in?
Is there a makefile or set of instructions anywhere for compiling and running it? (E.g. on Ubuntu Linux?
FORTRAN 77. The .pro files are in Interactive Data Language (IDL:
http://en.wikipedia.org/wiki/IDL_%28pro ... anguage%29)
There is no makefile. I hope this is a help! If you want to work with the code I would be grateful to know about your project and offer what advice I could.
- RJN
