Archive for May 3, 2019

05/03/2019 – Ephemeris – How do you take a picture of a black hole? Find out tonight.

May 3, 2019 Comments off

Ephemeris for Friday, May 3rd. Today the Sun will be up for 14 hours and 19 minutes, setting at 8:49, and it will rise tomorrow at 6:28. The Moon, 1 day before new, will rise at 6:44 tomorrow morning.

Nearly a month ago the world was presented with the news and the image that the Earth spanning Event Horizon Telescope captured a picture of a black hole 55 million light years away. Tonight NMC Professor Jerry Dobek will explain how it was done at tonight’s meeting of the Grand Traverse Astronomical Society at Northwestern Michigan College’s Rogers Observatory starting at 8 p.m. He will explain how simultaneous observations of the black hole by 8 separate sub-millimeter radio telescopes that were separately recorded on disk.  The disks were brought and processed together to produce the image. Starting at 9 p.m. if it’s clear there will be a star party featuring the brighter wonders of the darkening sky.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.


Black hole in M87

The first image of the black hole in M87. Credit Event Horizon Telescope.