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ASCL Code Record

[ascl:9910.006] BHSKY: Visual distortions near a black hole

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.

Website:
http://antwrp.gsfc.nasa.gov/htmltest/rjn_bht.html http://ascl.net/phpBB3/download/file.php?id=8
Appears in:
http://adsabs.harvard.edu/abs/1993AmJPh..61..619N
Bibcode:
1999ascl.soft10006N
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