#astronomy This Week’s Sky at a Look, October 18 – 26

October 18, 2019 - Comment

Friday, Oct. 18 • Vega is the brightest star excessive within the west after darkish. To its decrease proper by 14° (almost a fist and a half at arm’s size), search for Eltanin, the nostril of Draco the Dragon. The remainder of Draco’s fainter, lozenge-shaped head is a bit of farther behind. Draco at all

Friday, Oct. 18

• Vega is the brightest star excessive within the west after darkish. To its decrease proper by 14° (almost a fist and a half at arm’s size), search for Eltanin, the nostril of Draco the Dragon. The remainder of Draco’s fainter, lozenge-shaped head is a bit of farther behind. Draco at all times eyes Vega.

The principle stars of Vega’s personal constellation, Lyra — fairly faint by comparability — lengthen to Vega’s left (by 7°).

Saturday, Oct. 19

• Vega shines excessive within the west after darkish. About equally excessive within the southwest is Altair, not fairly as shiny. Simply higher proper of Altair, by a finger-width at arm’s size, spot little orange Tarazed. Down from Tarazed runs the stick-figure spine of Aquila, the Eagle.

Waning Moon in Gemini at dawn, Oct. 20-21, 2019

On Sunday and Monday mornings the Moon shows itself in Gemini . . .

Waning Moon in Leo at dawn, Oct. 23-24, 2019

. . . and on Wednesday and Thursday mornings, the waning Moon says howdy and goodbye to Regulus.

Sunday, Oct. 20

• Spot Altair excessive within the southwest quickly after darkish. Two distinctive little constellations lurk above it: Delphinus the Dolphin, hardly greater than a fist at arm’s size to Altair’s higher left, and fainter Sagitta the Arrow, barely much less far to Altair’s higher proper. Sky too shiny? Use binoculars!

• At daybreak on Monday the 21st the Moon is only a few hours from being precisely final quarter, as proven right here. See subsequent entry.

Monday, Oct. 21

• Final-quarter Moon; precisely so at eight:39 a.m. EDT. Many hours later, when the Moon rises round midnight or 1 a.m. tonight, the Moon’s terminator will already be wanting just a bit concave. The Moon will then be in dim Most cancers, under Castor and Pollux and left of Procyon.

Binoculars is not going to solely present the form of the terminator higher, they need to additionally reveal the unfastened Beehive Star Cluster only a few levels from the Moon throughout the identical binocular area of view — if the air is sufficiently clear and clear.

By daybreak Tuesday morning the Moon can be excessive within the southeast.

Tuesday, Oct. 22

• Deneb is the zenith star after dusk (for skywatchers at mid-northern latitudes). Brighter Vega shines to its west. Altair shines farther right down to Deneb’s south-southwest.

Whereas it is nonetheless twilight, draw a line from Deneb by way of the midpoint between Vega and Altair. Maintain following this line approach down, and you may hit Jupiter low within the southwest, on its technique to setting.

Wednesday, Oct. 23

• It is attending to be the time of 12 months when the Massive Dipper lies down horizontal low within the north-northwest within the night. How low? The farther south you might be, the decrease. Seen from 40° north (New York, Peoria, Denver) even its backside stars twinkle almost ten levels excessive. However at Miami (26° N) the whole Dipper skims alongside out of sight slightly below the northern horizon.

Thursday, Oct. 24

• Search for Capella glowing low within the northeast these evenings. Search for the Pleiades cluster, fingertip-size, about three fists at arm’s size to Capella’s proper. These harbingers of the chilly months rise increased as night grows late.

Higher proper of Capella, and higher left of the Pleiades, the celebrities of Perseus lie astride the Milky Means.

Friday, Oct. 25

• The Ghost of Summer time Suns. Halloween is approaching, and because of this Arcturus, the star glowing low within the west-northwest in twilight, is taking over its function as “the Ghost of Summer time Suns.” For a number of days centered on October 25th yearly, Arcturus occupies a particular place above your native panorama. It carefully marks the spot the place the Solar stood on the identical time, by the clock, throughout scorching June and July — in broad daylight, in fact!

So, as Halloween approaches yearly, you may see Arcturus because the chilly remaining ghost of the departed summer season Solar.

Saturday, Oct. 26

• The W of Cassiopeia now stands vertically on finish within the night, excessive within the northeast. To its proper, excessive within the east, are Andromeda and the corner-balanced Nice Sq. of Pegasus.


Wish to develop into a greater astronomer? Study your approach across the constellations. They’re the important thing to finding all the pieces 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 overlaying the entire night sky, use the massive month-to-month map within the heart of every concern 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 Version for simpler studying within the night time. Pattern chart.

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

Subsequent up is the bigger and deeper Sky Atlas 2000.Zero, plotting stars to magnitude eight.5; almost thrice as many. The subsequent up, as soon as your approach round, are the even bigger Interstellarum atlas (stars to magnitude 9.5) and Uranometria 2000.Zero (stars to magnitude 9.75). And you may must know find out how to use sky charts with a telescope.

You will additionally need a good deep-sky guidebook, corresponding 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 inexperienced persons, I do not assume, and never on mounts and tripods which might be lower than top-quality mechanically (which means actually heavy and costly). And as Terence Dickinson and Alan Dyer say of their Yard Astronomer’s Information, “A full appreciation of the universe can’t come with out growing the talents to seek out issues within the sky and understanding how the sky works. This information comes solely by spending time beneath the celebrities with star maps in hand.”

This Week’s Planet Roundup

Mercury and Venus are very low in shiny twilight after sundown. Begin by making an attempt for Venus, magnitude –Three.eight. It is simply above the west-southwest horizon a mere 20 minutes after sundown. Binoculars will assist.

To its left is Mercury, a lot dimmer at magnitude –Zero.1 all week. Their separation shrinks from eight° on October 18th to five° on the 25th. Good luck; convey binoculars no less than.

Mars (a mere magnitude +1.eight, in Virgo) is a troublesome catch simply above the east horizon in early to mid- daybreak. Once more, you will want binoculars.

Jupiter (magnitude –2.Zero, in southern Ophiuchus) is the white dot low within the southwest as twilight fades.

Saturn on August 23rd. Even six weeks earlier than quadrature, the globe’s black shadow on the rings was already pretty extensive and outstanding; it is decrease proper of the globe right here. South is up, celestial east is true. Damian Peach took this picture remotely with the 1-meter Chilescope.

Saturn (magnitude +Zero.5, in Sagittarius) is the regular yellow “star” within the south-southwest throughout and after nightfall. It is 23° higher left of Jupiter.

Saturn is simply two weeks previous its japanese quadrature with the Solar, so from our viewpoint, the planet’s globe casts its shadow nicely eastward onto the rings, including to the entire association’s Three-D look in a telescope. And the rings are tilted 25° into our line of sight, almost as open as we ever see them.

Beneath Saturn is the deal with of the Sagittarius Teapot, highlighted by 2.Zero-magnitude Sigma Sagittarii (Nunki). Barely above Saturn is the dimmer, smaller bowl of the Sagittarius Teaspoon.

Uranus (magnitude 5.7, in southern Aries) is nicely up within the east by 9 p.m. daylight saving time. It is highest within the south round midnight or 1.

Neptune (magnitude 7.eight, in japanese Aquarius) is in excessive view within the southern sky these evenings. See our finder charts for Uranus and Neptune and Bob King’s story on observing 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 rely on longitude (primarily Moon positions) are for North America.

Japanese 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 hazards of not pondering clearly are a lot better now than ever earlier than. It is not that there is one thing new in our mind-set, it is that credulous and confused pondering will be far more deadly in methods it was by no means earlier than.”
— Carl Sagan, 1996

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