Planètes du crépuscule et de l’aube, une éclipse lunaire et l’amas d’étoiles Coma

Quoi de neuf en mai ? Les planètes du crépuscule et de l’aube, une éclipse lunaire et l’amas d’étoiles Coma.

Carte du ciel montrant Mercure bas dans le ciel occidental le 2 mai, accompagné du croissant de lune et de l’étoile brillante Aldebaran. Crédit : NASA / JPL-Caltech

Le mois de mai commence et se termine par quelques excellentes opportunités d’observation des planètes. Le 2 mai, regardez vers l’ouest environ 45 minutes après le coucher du soleil pour trouver Mercure à environ 10 degrés de l’horizon, accompagné d’un mince croissant de lune. Juste au sud de la Lune se trouve l’étoile géante rouge brillante Aldebaran, qui devrait avoir à peu près la même luminosité que Mercure. (Et en passant, c’est la seule chance de repérer une planète à l’œil nu en début de soirée jusqu’en août.)

Jupiter et Mars apparaîtront extrêmement proches

Carte du ciel montrant comment Jupiter et Mars apparaîtront extrêmement proches dans le ciel du matin les 28 et 30 mai. Crédit : NASA / JPL-Caltech

Ensuite, la dernière semaine de mai, vous pouvez regarder chaque matin comme[{” attribute=””>Jupiter and Mars get increasingly close in the predawn sky. Their morning meetup culminates in a close conjunction that you can watch on the 28th through the 30th, where they’ll be separated by barely the width of the full moon. Should look incredible with binoculars, where you can also see Jupiter’s largest moons.

Skywatchers in the Western Hemisphere can look forward to a total lunar eclipse in mid-May. The event will be visible across the Americas, Europe, and Africa – basically anywhere the Moon is above the horizon at the time.

Eclipse Visibility Map May 2022 Total Lunar Eclipse

Eclipse visibility map for the May 15-16, 2022 total lunar eclipse. Credit: NASA/JPL-Caltech

The visible part of the eclipse begins about 10:30 p.m. U.S. Eastern time on May 15th, with totality starting an hour later and lasting for about an hour and a half. Those in the Eastern U.S. will see the eclipse start with the Moon well above the horizon. For the Central U.S., the eclipse starts about an hour and a half after dark, with the Moon relatively low in the sky. On the West coast of the U.S., the Moon rises with totality beginning or already underway, so you’ll want to find a clear view toward the southeast if viewing from there.

Now, lunar eclipses are the ones that are safe to look at directly with your eyes, binoculars, or a telescope (unlike solar eclipses).

The Moon takes on a dim, reddish hue during the period of totality. Even though the Moon is fully immersed in Earth’s shadow at that time, red wavelengths of sunlight filter through Earth’s atmosphere and fall onto the Moon’s surface. One way to think of this is that a total lunar eclipse shows us a projection of all the sunrises and sunsets happening on the planet at that moment.

So check your local details for this eclipse, and find lots more eclipse info from NASA at this link. 

Finally in May, a really nice target for binoculars: the Coma star cluster. This loose, open star cluster displays 40 or 50 stars spread over a region of sky about three finger-widths wide. The brightest stars in the cluster form a distinctive Y shape, as seen here.

Coma Star Cluster in May

Sky chart showing where to find the Coma star cluster in May. The cluster is about 6° wide, and is located about 15° east of the hindquarters of Leo, the lion constellation, which is found high overhead in the south. Credit: NASA/JPL-Caltech

The Coma star cluster is located about 300 light-years away, making it the second-closest open cluster to Earth after the Hyades cluster in Taurus.

To find the Coma star cluster, look southward for the constellation Leo. It can be easiest to start from the Big Dipper, toward the north, and use the two “pointer stars” on the end which always point you toward Leo. Once you’ve identified Leo, the Coma star cluster is about 15 degrees to the east of the triangle of stars representing the lion’s hindquarters. It’s relatively easy to find with binoculars, even under light-polluted urban skies – as long as it’s clear out.

So here’s wishing you clear skies for finding the Coma star cluster and any other wonders you discover in the night sky in May.

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