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Watch the Crescent Moon Occult Spica for North America Early Wednesday Morning

November 29, 2024
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Watch the Crescent Moon Occult Spica for North America Early Wednesday Morning
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Among the finest vibrant star lunar occultations for 2024 happens this week, because the Moon covers Spica.

Have you ever ever seen the Moon blot out a star? If the climate cooperates, early morning viewers throughout japanese North America have an opportunity to see a uncommon spectacle, because the crescent Moon occults (covers) the brilliant star Spica.

When to Watch

The occasion is centered on the early morning hours of Wednesday, November 27th at 12:16 Common Time (UT)/7:16 AM EST/6:16 AM CST. The Worldwide Occultation Timing Affiliation (IOTA) has a listing of ingress/egress occasions for select sites within the occultation footprint. The IOTA additionally has a extra technical dialogue of the occasion here. The Moon is a -13% illuminated, waning crescent (simply 4 days from New) in the course of the occasion, which means that Spica will ingress on the daytime lit facet, and egress alongside the nighttime darkish limb of the Moon.

Map
The occultation visibility footprint for Wednesday morning’s occasion. The strong strains denote the place the occasion is seen underneath darkish skies, blue is twilight, and damaged strains means the occasion happens underneath daytime skies. Credit score: Occult 4.2.

The ‘Wow Issue’

It’s an odd celestial scene: like throughout a complete photo voltaic eclipse, you’re standing within the shadow of the Moon… however on this case, it’s ‘solid’ by +1st magnitude Spica… from 250 light-years away. Also referred to as Alpha Virginis because the brightest star within the constellation Virgo, Spica additionally holds the excellence of a contender for a close-by galactic supernova occasion within the far future.

Map
Cloud cowl proportion prospects for Wednesday morning. Credit score: NOAA/NWS.

Occultations are fascinating and essential to astronomers, as they offer us an opportunity to research each objects concerned. Within the case of the star, we would discover the teeny angular diameter because it winks out, maybe briefly revealing a faint secondary companion. Within the case of Spica, its obvious measurement is 0.906 milliarcseconds, and is a spectroscopic binary with a detailed companion star in a detailed 4 day orbit.

Going to the Grazeline

An occultation also can assist to map out the jagged limb or profile of the Moon. This works because the star blinks out and in of view. Think about the star enjoying peek-a-boo with mountain peaks, shining down lunar valleys. The southern grazeline to see such a spectacle Wednesday morning crosses Texas, New Mexico and Arizona and isn’t to be missed.

Grazeline Map
The grazeline restrict throughout the southwestern U.S. Credit score: IOTA

The ‘Spica Cycle’

Spica is likely one of the 4 vibrant stars that lies alongside the trail of the Moon within the present epoch. The opposite three are Aldebaran, Regulus and Antares. Like eclipses, these happen in cycles. The Moon covers the star as soon as per each 29.5 day synodic lunation. This continues till the monitor of the Moon carries it slowly away. In 2024 into 2025, the Moon can also be occulting Antares as effectively. Additionally, like eclipses, the monitor for occultations strikes 120 levels west in longitude from one occasion to the following.

Observing and Imaging

Spica is vibrant sufficient to trace close to the Moon proper up into the brilliant daybreak, simply earlier than dawn. The occasion additionally lends itself effectively to video seize. You’ll be capable of simply see Spica disappear and reappear utilizing binoculars… and even with simply the unaided eye. The star might be rather more distinguished alongside the darkish nighttime limb of the Moon.

Faint, however there… Spica close to the daytime Moon. Credit score: Dave Dickinson.

In a slow-moving Universe, occultations give us an opportunity to see change occurring in a break up second. Don’t miss ‘The Nice American Occultation,’ as Spica disappears behind the Moon Wednesday morning, and the celestial drama of the sky above us continues.

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