This Week’s Sky at a Look, July 19 – 27

July 19, 2019 - Comment

All week Jupiter hangs higher left of Antares, and Saturn hangs higher left of the Sagittarius Teapot. Friday, July 19 • The tail of Scorpius is low due south after darkish, as proven above. How low relies on how far north or south you reside: the farther south, the upper. Search for the 2 stars



Jupiter and Saturn at nightfall, mid-July 2019

All week Jupiter hangs higher left of Antares, and Saturn hangs higher left of the Sagittarius Teapot.

Friday, July 19

• The tail of Scorpius is low due south after darkish, as proven above. How low relies on how far north or south you reside: the farther south, the upper.

Search for the 2 stars particularly shut collectively within the tail. These are Lambda and fainter Upsilon Scorpii, often called the Cat’s Eyes. They’re canted at an angle; the cat is tilting his head and winking.

The Cat’s Eyes level to the suitable by almost a fist-width towards Mu Scorpii, a a lot tighter pair (proven as a single dot on the map) often called the Little Cat’s Eyes. They’re oriented nearly precisely the identical approach as Lambda and Upsilon. Are your eyes sharp sufficient to resolve the Mu pair with out utilizing binoculars? Not many individuals can!

Saturday, July 20

• Scorpius is typically known as “the Orion of Summer season” for its brightness, its blue-white big stars, and its distinguished pink supergiant (Antares within the case of Scorpius, Betelgeuse for Orion). However Scorpius passes quite a bit decrease throughout the south than Orion does, for these of us at mid-northern latitudes. Which means it has just one actually good night month: July.

Catch Scorpius due south simply after darkish now, earlier than it begins to tilt decrease towards the southwest. It is filled with deep-sky objects to hunt with a sky atlas and binoculars or a telescope.

• As soon as the Moon does rise, ponder the second 50 years in the past at the moment when a person took step one onto one other world. The sundown terminator tonight is approaching Tranquillity Base, and the whole lot there should be casting lengthy shadows.

Sunday, July 21

• After dusk, Altair shines within the east-southeast. It is the second-brightest star on the japanese aspect of the sky, after Vega very excessive to its higher left. Above Altair by a finger-width at arm’s size is little orange Tarazed.

A bit greater than a fist-width to Altair’s left or decrease left is little Delphinus, the Dolphin, leaping leftward.

Above the midpoint between Altair and Delphinus is even fainter little Sagitta, the Arrow.

Monday, July 22

• Bought a extremely darkish sky? Or planning to trip underneath one? The Milky Approach arches excessive throughout the japanese sky now — from Perseus and Cassiopeia low within the north-northeast, throughout Cygnus and thru the Summer season Triangle excessive within the east, and down by means of Sagittarius and the tail of Scorpius low within the south.

Deliver a low-power, wide-field scope for some grand star fields. And for an uncommon tour, carry the July problem of Sky & Telescope to hunt out a few of the spooky darkish nebulae in Ophiuchus over Jupiter — utilizing Richard Wild’s “Going Deep” column and chart beginning on web page 57.

Tuesday, July 23

• Week by week, shiny Arcturus is dropping a few of its peak within the west after darkish.

Search for Spica decrease left of Arcturus by about three fists at arm’s size. Decrease proper of Arcturus by the identical quantity is Denebola, tailtip of Leo. These three stars kind a virtually good equilateral triangle.

Wednesday, July 24

• Final-quarter Moon (actual at 9:18 p.m. EDT). The Moon rises late tonight, round midnight or 1 a.m., approach down beneath Andromeda and Pegasus within the east.

Thursday, July 25

• With the advance of summer time, the Sagittarius Teapot is within the south these evenings (to the decrease proper of Saturn). It is beginning to tilt and pour from its spout to the suitable. The Teapot will tilt farther and farther for the remainder of the summer time — or for a lot of the night time in case you keep out late.

Friday, July 26

• Vibrant Vega now passes closest to overhead round 11 p.m., relying on how far east or west you reside in your time zone. How intently it misses your zenith relies on how far north or south you’re. It passes proper by means of your zenith in case you’re at latitude 39° north (Washington DC, Cincinnati, Kansas Metropolis, Lake Tahoe). How intently are you able to decide this simply by wanting?

Deneb crosses closest to the zenith nearly precisely two hours after Vega.

Moon in Taurus with Aldebaran, July 27-29, 2019

As daybreak begins to brighten on July 27th by means of 29th, the waning crescent Moon hangs in Taurus.

• Chilly-weather preview: Earlier than the start of daybreak on Saturday morning the 27th, you may discover the waning Moon hanging almost between Aldebaran and the Pleiades, stars which can be extra acquainted within the night sky of late fall and winter.

The “5 a.m.” on the chart right here applies provided that you are near your time zone’s commonplace longitude. In any case, wherever you’re, your finest time — with probably the most stars — shall be simply earlier than daybreak begins: as a lot as two hours earlier than your native dawn.

Saturday, July 27

• We’re not but midway by means of summer time, however already W-shaped Cassiopeia, a constellation of fall and winter evenings, is climbing up within the north-northeast as night grows late. And the Nice Sq. of Pegasus, emblem of fall, comes as much as steadiness on one nook over the japanese horizon.

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Wish to turn out to be a greater astronomer? Study your approach across the constellations. They’re the important thing to finding the whole lot fainter and deeper to hunt with binoculars or a telescope.

That is an outside nature passion. For an easy-to-use constellation information protecting the entire night sky, use the massive month-to-month map within the middle of every problem of Sky & Telescope, the important information to astronomy.

Jumbo Pocket Sky Atlas cover

The Pocket Sky Atlas plots 30,796 stars to magnitude 7.6, and tons of of telescopic galaxies, star clusters, and nebulae amongst them. Proven above is the Jumbo Version for simpler studying within the night time. Pattern chart.

When you get a telescope, to place it to good use you may want an in depth, large-scale sky atlas (set of charts). The fundamental commonplace is the Pocket Sky Atlas (in both the unique or Jumbo Version), which reveals stars to magnitude 7.6.

Subsequent up is the bigger and deeper Sky Atlas 2000.zero, plotting stars to magnitude eight.5; almost 3 times as many. The following up, as soon as you understand your approach round, are the even bigger Interstellarum atlas (stars to magnitude 9.5) and Uranometria 2000.zero (stars to magnitude 9.75). And skim easy methods to use sky charts with a telescope.

You may additionally desire a good deep-sky guidebook, equivalent to Sue French’s Deep-Sky Wonders assortment (which incorporates its personal charts), Sky Atlas 2000.zero Companion by Robust and Sinnott, or the larger Evening Sky Observer’s Information by Kepple and Sanner.

Can a computerized telescope change charts? Not for newbies, I do not suppose, and never on mounts and tripods which can be lower than top-quality mechanically (that means heavy and costly). And as Terence Dickinson and Alan Dyer say of their Yard Astronomer’s Information, “A full appreciation of the universe can not come with out growing the abilities to search out issues within the sky and understanding how the sky works. This data comes solely by spending time underneath the celebs with star maps in hand.”

This Week’s Planet Roundup

Mercury, Venus, and Mars are out of sight within the glare of the Solar. Mercury shall be again in view within the daybreak come August, however Venus and Mars are mainly gone till October.

Jupiter with Red Spot on July 2, 2019

Jupiter’s Nice Purple Spot seems to be fairly regular visually in a telescope, however study this high-res picture taken July 2nd by Christopher Go. South right here is up. Be aware the small extensions on the spot’s previous (left) and south following (higher proper) sides. And, says Go, “Be aware the flake exercise on the next aspect.”

Jupiter (magnitude –2.5, in southern Ophiuchus) is the white level evident within the south throughout and after nightfall. Orange Antares, a lot fainter at magnitude +1.zero, twinkles 7° to Jupiter’s decrease proper.

Jupiter and Antares kind a large, shallow, isosceles triangle with Delta Scorpii (Dschubba) to their proper. Delta, a long-term eruptive variable of the Gamma Cassiopeiae kind, has been not a lot fainter than Antares for a lot of the final 19 years — after it brightened by some 50%, with out warning, in July 2000.

In a telescope Jupiter is shrinking just a bit, from 44 to 43 arcseconds vast this week. See Bob King’s observing information to Jupiter.

Saturn (magnitude +zero.1, in Sagittarius) is the regular, pale yellowish “star” within the south-southeast after darkish, 31° east (left) of Jupiter. Look to Saturn’s decrease proper for the Sagittarius Teapot.

In a telescope Saturn’s rings are tilted a large 23° to our line of sight, not fairly as open as they have been for the final couple of years.

Uranus (magnitude 5.eight, in Aries) is excessive within the east earlier than the primary beginnings of daybreak.

Neptune (magnitude 7.eight, in Aquarius) is excessive within the south at the moment. Finder charts for Uranus and Neptune.

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All descriptions that relate to your horizon — together with the phrases up, down, proper, and left — are written for the world’s mid-northern latitudes. Descriptions that additionally rely on longitude (primarily Moon positions) are for North America.

Jap Daylight Time (EDT) is Common Time (UT, UTC, GMT, or Z time) minus four hours.

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Audio sky tour. Out underneath the night sky along with your earbuds in place, take heed to Kelly Beatty’s month-to-month podcast tour of the heavens above. It is free.

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“This journey is made potential by generations of searchers strictly adhering to a easy algorithm. Check concepts by experiments and observations. Construct on these concepts that go the check. Reject those that fail. Observe the proof wherever it leads, and query the whole lot. Settle for these phrases, and the cosmos is yours.”
— Neil deGrasse Tyson, 2014

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