Home > Ephemeris Program, Stars > 01/26/2021 – Ephemeris – A look at the bright red giant star Betelgeuse

01/26/2021 – Ephemeris – A look at the bright red giant star Betelgeuse

January 26, 2021

This is Ephemeris for Tuesday, January 26th. Today the Sun will be up for 9 hours and 35 minutes, setting at 5:43, and it will rise tomorrow at 8:06. The Moon, 2 days before full, will set at 7:38 tomorrow morning.

At 8 pm the constellation of Orion the hunter is in the southeastern sky. The bright reddish star at the top left of Orion’s distinctive seven-star pattern is Betelgeuse a star near the end of its life. Being a single bright star, its distance is not well determined and is estimated to be about 550 light years away with an uncertainty of up to 20 percent, which make other estimates that uncertain too, like its mass and diameter. It’s somewhat less than 20 times the mass of the Sun, and a diameter possibly as large as Jupiter’s orbit of the Sun. It is old for a star of its mass, probably 8 million years old, with up to a million years to go on the outside before it will probably explode as a supernova and grace our skies as bright as the Moon for the better part of the better part of a year.

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



The seven brightest stars of Orion in the south-southeast at 8 p. in late January.

Betelgeuse drawing

“This artist’s impression shows the supergiant star Betelgeuse as it was revealed thanks to different state-of-the-art techniques on ESO’s Very Large Telescope, which allowed two independent teams of astronomers to obtain the sharpest ever views of the supergiant star Betelgeuse. They show that the star has a vast plume of gas almost as large as our Solar System and a gigantic bubble boiling on its surface. These discoveries provide important clues to help explain how these mammoths shed material at such a tremendous rate. The scale in units of the radius of Betelgeuse as well as a comparison with the Solar System is also provided.” Credit: ESO/L. Calçada (ESO is the European Southern Observatory)

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