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This Week’s Sky at a Glance, August 30 – September 7 – Sky & Telescope

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Moon, Jupiter, Saturn at dusk, Sept. 4-8, 2019

The waxing Moon will step eastward previous Jupiter and Saturn, over Scorpius and Sagittarius. (The blue 10° scale is concerning the dimension of your fist at arm’s size.)

Friday, Aug. 30

• The Milky Manner extends upward from the low south-southwest simply after darkish. Earlier than the Moon turns into vivid later this week, that is your final good probability this yr to lastly get straight which clumps are the Massive Sagittarius Star Cloud (with M8 above it), the Small Sagittarius Star Cloud (a.ok.a. M24), the lesser-known Gamma Scuti Star Cloud, and the Scutum Star Cloud on high. In a darkish sky they stand out virtually ladder-like. See the labeled picture with Fred Schaaf’s “Musings on Eternity” within the September Sky & Telescope, web page 45.

• New Moon (actual at 6:37 a.m. on this date EDT.)

Saturday, Aug. 31

• Altair is the brightest star on the southern facet of the sky after darkish. (We’re not counting the planets Jupiter and Saturn, far to its decrease proper.) Spot Altair’s little orange companion Tarazed to its higher proper by only a finger width at arm’s size.

Look to Altair’s higher left, by a bit greater than a fist, for little Delphinus, the Dolphin.

Nearer above Altair is even smaller, fainter Sagitta, the Arrow.

Sunday, Sept. 1

• By 9 or 10 p.m. two of probably the most well-known deep-sky objects, the Double Cluster in Perseus and the Nice Andromeda Galaxy M31, are in excessive view within the east. Do you know they’re solely 22° aside? They’re each cataloged as 4th magnitude however to the bare eye they give the impression of being relatively totally different, the extra so the darker your sky. See for your self; they’re plotted on the all-sky constellation map within the heart of the September Sky & Telescope, which needs to be all of the map that you must determine their places. Sky too vivid? Use binoculars!

The 2 clusters of the Double Cluster (NGC 869 and NGC 884) are at very comparable distances about 7,600 light-years away. M31, at 2.5 million light-years, is about 330 instances farther out.

Monday, Sept. 2

• Every time vivid Vega crosses nearest your zenith, because it does at dusk now, you recognize that the Sagittarius Teapot should be at its highest due south even when it is hidden by buildings or bushes (or twilight). The Teapot is at present beneath Saturn.

Two hours later when Deneb crosses closest to the zenith, it is the flip of Delphinus and boat-shaped Capricornus down under to face at their highest within the south.

Tuesday, Sept. three

• Even with a modest telescope beneath a mediocre sky, do you know you possibly can see the black-hole microquasar Cygnus X-1 — or relatively the Ninth-magnitude star feeding it? It is zero.four° east of 4th-magnitude Eta Cygni excessive overhead. For a finder chart, you should utilize the picture that leads Dave Tosteson’s “Microquasars” within the September Sky & Telescope, web page 57. Celestial north there’s up and east is to the left.

Wednesday, Sept. four

• The Moon at nightfall hangs left of Jupiter, Antares, and the top of Scorpius, as proven on the high of this web page.

A winter preview: Step out earlier than the primary gentle of daybreak this week, and the sky shows the starry panorama it’ll after dinnertime in late January and early February. Orion strides up within the southeast, with Aldebaran after which the Pleiades excessive above it. Sirius sparkles far under Orion. The Gemini twins are mendacity on their sides effectively up within the east.

Thursday, Sept. 5

• First-quarter Moon (actual at 11:10 p.m. EDT). It poses in an fascinating setting. As the celebs come out, you may discover Jupiter shining a number of levels to the Moon’s left (for North America) and dimmer orange Antares twinkling farther under it. See the highest of this web page.

Friday, Sept. 6

• The 2 brightest stars (not planets) of September evenings are Vega excessive overhead and Arcturus within the west, each magnitude zero.

Draw a line from Vega all the way down to Arcturus. A 3rd of the best way down you cross the dim Keystone of Hercules.

Two thirds of the best way down you cross the dim semicircle of Corona Borealis with its one modestly vivid star: Alphecca, the gem of the crown.

Effectively to the fitting of Arcturus, within the northwest, the Large Dipper is popping increasingly degree.

Saturday, Sept. 7

• Look left of the gibbous Moon at nightfall for Saturn, as proven on the high of this web page. Under the Moon, are you able to piece out the Sagittarius Teapot?


Need to develop into a greater astronomer? Study your means 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 out of doors nature pastime. For an easy-to-use constellation information protecting the entire night sky, use the massive month-to-month map within the heart of every difficulty 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 a whole lot of telescopic galaxies, star clusters, and nebulae amongst them. Proven above is the Jumbo Edition for simpler studying within the night time. Sample 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 normal is the Pocket Sky Atlas (in both the original or Jumbo Edition), which exhibits stars to magnitude 7.6.

Subsequent up is the bigger and deeper Sky Atlas 2000.0, plotting stars to magnitude eight.5; almost 3 times as many. The following up, as soon as you recognize your means round, are the even bigger Interstellarum atlas (stars to magnitude 9.5) and Uranometria 2000.0 (stars to magnitude 9.75). And browse how to use sky charts with a telescope.

You may additionally desire a good deep-sky guidebook, comparable to Sue French’s Deep-Sky Wonders assortment (which incorporates its personal charts), Sky Atlas 2000.0 Companion by Robust and Sinnott, or the larger Night Sky Observer’s Guide by Kepple and Sanner.

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

This Week’s Planet Roundup

Illustrates impact flashes

On August seventh, newbie imager Ethan Chappel was videorecording Jupiter when a tiny vivid flare appeared on it for a few second — very similar to the six earlier meteor impacts in Jupiter’s environment detected this manner. See Texas Amateur Detects Possible Impact on Jupiter.

Mercury, Venus, and Mars are out of sight behind the glare of the Solar.

Jupiter (magnitude –2.2, between the ft of Ophiuchus) is the white dot hanging within the south-southwest as twilight fades away. Get your scope on it early earlier than it sinks decrease into poorer seeing. Orange Antares, a lot fainter at magnitude +1.zero, twinkles 7° to Jupiter’s decrease proper. In a telescope, Jupiter is barely 39 arcseconds vast and shrinking.

Saturn on August 23rd, imaged by Damian Peach with the 1-meter Chilescope. South is up. “Poor to truthful seeing allowed an affordable consequence,” he writes. That is being modest. With a scope that enormous at a latitude the place Saturn is excessive overhead, the North Polar Hexagon and its central darkish spot present right here clear as day.

Saturn (magnitude +zero.three, in Sagittarius) is the regular, pale yellowish “star” within the south-southeast throughout and after nightfall, 30° left or higher left of Jupiter. Under Saturn is the deal with of the Sagittarius Teapot.

Uranus (magnitude 5.7, in Aries) is effectively up within the east by midnight and highest within the south earlier than the start of daybreak.

Neptune (magnitude 7.eight, very shut of 4th-magnitude Phi Aquarii this week) is effectively up within the southeast by 10 or 11 p.m. and highest within the south by 1 or 2 a.m. Neptune is sort of at opposition. Finder charts for Uranus and Neptune.


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 depend upon longitude (primarily Moon positions) are for North America.

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


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


“The risks of not pondering clearly are a lot better now than ever earlier than. It isn’t that there is one thing new in our mind-set, it is that credulous and confused pondering may be way more deadly in methods it was by no means earlier than.”
— Carl Sagan, 1996

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