Starwatch: the October night sky

What to look out for during the coming weeks, including the Orionids meteor shower during the second half of October

October night sky chart

With Jupiter now lost in the Sun’s glare, our one remaining naked-eye evening planet sets around one hour before our map times. Saturn, shining at mag 0.5 and now incorporating the ashes of Cassini, is the brightest object low in the SW at nightfall.

Seen telescopically, Saturn’s disc appears 16 arcsec wide while the rings span 36 arcsec and have their N face tipped at their maximum angle of 27° to our view. Look for Saturn below-right of the young Moon on the 24th.

The Summer Triangle fills our high S sky at nightfall but is replaced by Pegasus by the map times. The right side of the Square of Pegasus points down to Fomalhaut, twinkling just above our S horizon. The leader of Piscis Austrinus, the Southern Fish, it is sometimes called the Lonely One because of its isolation. Other nearby watery groups include Capricornus the Sea Goat, Aquarius the Water Bearer and Cetus the Whale.

Another, Pisces the Fish, is unmarked on our chart but lies between Cetus and the Square. It is close to the star Omicron Piscium that Uranus stands opposite the Sun and 2,830m km away on the 19th. At mag 5.7, it is easy to spot through binoculars – search on the Web for a “Uranus finder chart” to help in locating it. The farthest planet, Neptune, is one seventh as bright at mag 7.8 and even closer to Lambda Aquarii.

Venus, a brilliant mag –3.9 morning star, climbs to stand 21° high in the ESE at sunrise on the 1st, when it is also 3° above-right of the much fainter (mag 1.8) Mars. As both track from Leo to Virgo, Venus passes close to Mars on the 5th and 6th and lies alongside the waning earthlit Moon on the 18th. Venus is 14° high at sunrise by the 31st, when it is 16° below-left of Mars and 5° above Virgo’s leader Spica.

The Orionids shower brings a flurry of fast meteors between the 16th and 30th, with 20 per hour or more visible under ideal skies from the 21st to 23rd. Diverging from a radiant point in N Orion, near the feet of Gemini, they are seen from around 22:00 BST but are most numerous during the pre-dawn as the radiant passes high in the S. Like May’s Eta Aquarids shower, the meteoroids derive from, and lie along the orbit of, Comet Halley.

October diary

5th 14h Venus 0.2° N of Mars; 20h Full moon

8th 22h Mercury in superior conjunction

9th 19h Moon 0.6° N of Aldebaran

12th 13h Last quarter

15th 12h Moon 0.2° N of Regulus

17th 11h Moon 1.8° N of Mars

18th 01h Moon 2.0° N of Venus

19th 19h Uranus at opposition; 20h New moon

21st-23rd Peak of Orionids meteor shower

24th 13h Moon 3° N of Saturn

26th 19h Jupiter in conjunction with Sun

27th 23h First quarter

29th 02h BST = 01h GMT End of Summer Time

* Times are BST until 29th

Contributor

Alan Pickup

The GuardianTramp

Related Content

Article image
The April night sky
Starwatch Jupiter rules the sky, but also watch out for comet 41P/Tuttle–Giacobini–Kresák and for the Lyrids meteor shower

Alan Pickup

26, Mar, 2017 @8:30 PM

Article image
The August night sky
Starwatch The main event of the next few weeks is the great American eclipse but plenty of Perseid meteors should be visible despite a bright moon

Alan Pickup

30, Jul, 2017 @8:30 PM

Article image
Starwatch: the November night sky
What to look out for in the coming month, including Jupiter and Venus at their brilliant best in the pre-dawn twilight and the annual Leonids meteor shower

Alan Pickup

29, Oct, 2017 @9:30 PM

Article image
Starwatch: Orion at his evening best
A detailed look at the Hunter who rules the sky for the next few weeks, plus a brief look at the planetary year ahead and August’s solar eclipse

Alan Pickup

15, Jan, 2017 @9:30 PM

Article image
Starwatch: the young moon draws close to Saturn in Sagittarius
Look to the south-west in the evening to find the crescent moon as it moves away from bright Venus and Jupiter towards the planet Saturn

Stuart Clark

24, Nov, 2019 @9:30 PM

Article image
The May night sky
Starwatch With starwatching in the northern hemisphere restricted by shorter nights, Jupiter rules the sky from dusk to dawn. Venus rules the morning in the southern hemisphere

Alan Pickup

30, Apr, 2017 @8:30 PM

Article image
The January night sky
Starwatch What to look out for in the first weeks of the new year, including the Quadrantid meteors

Alan Pickup

01, Jan, 2017 @9:30 PM

Article image
The December night sky
Starwatch The highlights to watch out for in December, including the annual Geminids meteor shower, somewhat swamped this year by the proximity of another ‘supermoon’

Alan Pickup

27, Nov, 2016 @9:30 PM

Article image
Starwatch: Saturn draws close to the Moon in the southern sky
The gibbous waning Moon is bright in the night sky while Venus and Jupiter shine out at evening

Stuart Clark

27, May, 2018 @8:30 PM

Article image
The September night sky
Starwatch The event of the month will take place at Saturn on 15 September, when Cassini is due to plunge to its destruction in the planet’s atmosphere

Alan Pickup

27, Aug, 2017 @8:30 PM