Archive for March 10, 2020

03/10/2020 – Ephemeris – A Closeup look at Gemini’s namesake stars

March 10, 2020 Comments off

Ephemeris for Tuesday, March 10th. Today the Sun will be up for 11 hours and 39 minutes, setting at 7:43, and it will rise tomorrow at 8:01. The Moon, 1 day past full, will rise at 9:07 this evening.

At 9 p.m. the constellation of Gemini the twins will be seen high in the south-southeast. The namesake stars of the two lads are the two bright stars at the upper left of the constellation. Pollux the pugilist, or boxer, is the lower of the two, while Castor, the horseman, is the other star, or rather a six star system. In telescopes two close stars may be seen each is a spectroscopic binary, meaning the two stars can be detected by the rainbow colors of light from the star. A faint nearby spectroscopic binary also belongs. Pollux, though a single star, does have at least one planet, over twice the mass of Jupiter orbiting it at a distance somewhat greater than Mars is from the Sun. Pollux is 34 light years away while Castor is 50 light years away.

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


Gemini finder

Gemini finder looking south-southeast at 9 p.m. March 10th, 2020. Created using Stellarium.

Castor and Pollux namesakes of Gemini

Castor and Pollux namesakes of the twins of Gemini in its position at 9 p.m. EDT March 10th. Created using Stellarium.

Castor star system

The Castor star system exploded in this JPL/NASA infographic.


Categories: Ephemeris Program, stars Tags: , ,