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News for Norther Colorado and the world

Saturday, November 1, 2014

Sky Tonight—January 18, Moon near Gemini stars Castor and Pollux

Courtesy of EarthSky
A Clear Voice for Science

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phase18 Sky Tonight—January 18, Moon near Gemini stars Castor and Polluxjan18 Sky Tonight—January 18, Moon near Gemini stars Castor and PolluxThe moon will look full tonight as it shines close to the constellation Gemini’s brightest stars, Castor and Pollux. The moon will not actually be astronomically full – or most opposite the sun – until tomorrow, on Wednesday, January 19.

Although we draw in the stick figure of the Gemini Twins on tonight’s chart, you will not see much of Gemini in the moonlight except for Castor and Pollux. By the last week in January – after the moon drops out of the evening sky – look for Gemini to shine in all its starlit majesty.

Are you familiar with the winter constellation Orion? If so, draw an imaginary line from the star Rigel through the star Betelgeuse to locate Castor and Pollux. Star-hop to Castor and Pollux tonight. Then try this trick on a moonless night.

Orion the Hunter easy to spot in January night sky

With binoculars, try finding the star Wasat close to tonight’s moon. As seen from North America this evening, Wasat shines about one pencil-width to the north (left or upper left) of the moon. Wasat is a rather dim 3rd-magnitude star, yet it is special because it sits almost exactly on the ecliptic – the sun’s yearly path in front of the backdrop stars. The sun and Wasat have a conjunction every year on or near July 10. In other words, on that day, Wasat and the sun rise together and cross the daytime sky together, with Wasat located behind the sun, vastly more distant from Earth.

Where is the ecliptic in relation to the Milky Way?

Let tonight’s full-looking waxing gibbous moon guide your eye to Wasat and the bright Gemini stars, Castor and Pollux!

Written by Bruce McClure


Astronomy Picture of the Day from NASA/JPL

EarthSky: Space

CHANDRA Photo Album

U.S. Naval Observator Astronomical Information center

Universe Today

StarDate Online

Sky and Telescope

National Geographic

Space Com

Simostronomy Blog

Amazing Space

The York County Astronomical Society

Scope City

James S McDonnell Planetarium

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