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The Evening Sky Map

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Sky Calendar – June 2023
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THE NIGHT SKY LOOKS
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http://twitter.com/skymaps
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More sky events and links at http://Skymaps.com/skycalendar/ G
TH CE
NT
O -H Open Star Cluster
ES 6231 6124 -T
ON
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ost
KY
MA O RIZ Globular Star Cluster
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 Easily Seen with the Naked Eye

NORTHERN HEMISPHERE
JUNE 2023
About the Celestial Objects
Listed on this page are several of the brighter, more interesting celestial objects Altair Aql Brightest star in Aquila. Name means "the flying eagle". Dist=16.8 ly.
visible in the evening sky this month (refer to the monthly sky map). The objects are Arcturus Boo Orange, giant K star. Name means "bear watcher". Dist=36.7 ly.
δ Cephei Cep Cepheid prototype. Mag varies between 3.5 & 4.4 over 5.366 days. Mag 6 companion.
grouped into three categories. Those that can be easily seen with the naked eye Deneb Cyg Brightest star in Cygnus. One of the greatest known supergiants. Dist=1,400±200 ly.
(that is, without optical aid), those easily seen with binoculars, and those requiring α Herculis Her Semi-regular variable. Magnitude varies between 3.1 & 3.9 over 90 days. Mag 5.4 companion.
a telescope to be appreciated. Note, all of the objects (except single stars) will Vega Lyr The 5th brightest star in the sky. A blue-white star. Dist=25.0 ly.
appear more impressive when viewed through a telescope or very large Antares Sco Red, supergiant star. Name means "rival of Mars". Dist=135.9 ly.
binoculars. They are grouped in this way to highlight objects that can be seen using Polaris UMi The North Pole Star. A telescope reveals an unrelated mag 8 companion star. Dist=433ly.
Spica Vir Latin name means "ear of wheat" and shown held in Virgo's left hand. Dist=250 ly.
the optical equipment that may be available to the star gazer.
Easily Seen with Binoculars
Tips for Observing the Night Sky η Aquilae Aql Bright Cepheid variable. Mag varies between 3.6 & 4.5 over 7.166 days. Dist=1,200 ly.
When observing the night sky, and in particular deep-sky objects such as star M3 CVn Easy to find in binoculars. Might be glimpsed with the naked eye.
μ Cephei Cep Herschel's Garnet Star. One of the reddest stars. Mag 3.4 to 5.1 over 730 days.
clusters, nebulae, and galaxies, it’s always best to observe from a dark location.

CELESTIAL OBJECTS
Mel 111 Com Coma Berenices. 80 mag 5-6 stars in 5 deg. Dist=283 ly. Age=400 million years.
Avoid direct light from street lights and other sources. If possible observe from a χ Cygni Cyg Long period pulsating red giant. Magnitude varies between 3.3 & 14.2 over 407 days.
dark location away from the light pollution that surrounds many of today’s large M39 Cyg May be visible to the naked eye under good conditions. Dist=900 ly.
cities. ν Draconis Dra Wide pair of white stars. One of the finest binocular pairs in the sky. Dist=100 ly.
You will see more stars after your eyes adapt to the darkness—usually about 10 to M13 Her Best globular in northern skies. Discovered by Halley in 1714. Dist=23,000 ly.
M92 Her Fainter and smaller than M13. Use a telescope to resolve its stars.
20 minutes after you go outside. Also, if you need to use a torch to view the sky
ε Lyrae Lyr Famous Double Double. Binoculars show a double star. High power reveals each a double.
map, cover the light bulb with red cellophane. This will preserve your dark vision. R Lyrae Lyr Semi-regular variable. Magnitude varies between 3.9 & 5.0 over 46.0 days.
Finally, even though the Moon is one of the most stunning objects to view M12 Oph Close to the brighter M10. Dist=18,000 ly.
through a telescope, its light is so bright that it brightens the sky and makes many M10 Oph 3 degrees from the fainter M12. Both may be glimpsed in binoculars. Dist=14,000 ly.
of the fainter objects very difficult to see. So try to observe the evening sky on IC 4665 Oph Large, scattered open cluster. Visible with binoculars.
6633 Oph Scattered open cluster. Visible with binoculars.
moonless nights around either New Moon or Last Quarter.
M8 Sgr Lagoon Nebula. Bright nebula bisected by a dark lane. Dist=5,200 ly.
M25 Sgr Bright cluster located about 6 deg N of "teapot's" lid. Dist=1,900 ly.
Astronomical Glossary M22 Sgr A spectacular globular star cluster. Telescope will show stars. Dist=10,000 ly.
M4 Sco A close globular. May just be visible without optical aid. Dist=7,000 ly.
Conjunction – An alignment of two celestial bodies such that they present the least M6 Sco Butterfly Cluster. 30+ stars in 7x binoculars. Dist=1,960 ly.
angular separation as viewed from Earth. M7 Sco Superb open cluster. Visible to the naked eye. Age=260 million years. Dist=780 ly.
Constellation – A defined area of the sky containing a star pattern. M5 Ser Fine globular star cluster. Telescope will reveal individual stars. Dist=25,000 ly.
Mizar & Alcor UMa Good eyesight or binoculars reveals 2 stars. Not a binary. Mizar has a mag 4 companion.
Diffuse Nebula – A cloud of gas illuminated by nearby stars. Cr 399 Vul Coathanger asterism or "Brocchi's Cluster". Not a true star cluster. Dist=218 to 1,140 ly.
Double Star – Two stars that appear close to each other in the sky; either linked by
gravity so that they orbit each other (binary star) or lying at different distances from
Telescopic Objects
Earth (optical double). Apparent separation of stars is given in seconds of arc ("). ε Boötis Boo Red giant star (mag 2.5) with a blue-green mag 4.9 companion. Sep=2.8". Difficult to split.
M94 CVn Compact nearly face-on spiral galaxy. Dist=15 million ly.
Ecliptic – The path of the Sun’s center on the celestial sphere as seen from Earth. M51 CVn Whirlpool Galaxy. First recognised to have spiral structure. Dist=25 million ly.
Elongation – The angular separation of two celestial bodies. For Mercury and Venus M64 Com Black-Eye Galaxy. Discovered by J.E. Bode in 1775 - "a small, nebulous star".
Albireo Cyg Beautiful double star. Contrasting colours of orange and blue-green. Sep=34.4".
the greatest elongation occurs when they are at their most angular distance from the 61 Cygni Cyg Attractive double star. Mags 5.2 & 6.1 orange dwarfs. Dist=11.4 ly. Sep=28.4".
Sun as viewed from Earth. γ Delphini Del Appear yellow & white. Mags 4.3 & 5.2. Dist=100 ly. Struve 2725 double in same field.
Galaxy – A mass of up to several billion stars held together by gravity. β Lyrae Lyr Eclipsing binary. Mag varies between 3.3 & 4.3 over 12.940 days. Fainter mag 7.2 blue star.
M57 Lyr Ring Nebula. Magnificent object. Smoke-ring shape. Dist=4,100 ly.
Globular Star Cluster – A ball-shaped group of several thousand old stars. M23 Sgr Elongated star cluster. Telescope required to show stars. Dist=2,100 ly.
Light Year (ly) – The distance a beam of light travels at 300,000 km/sec in one M20 Sgr Trifid Nebula. A telescope shows 3 dust lanes trisecting nebula. Dist=5,200 ly.
year. M21 Sgr A fine and impressive cluster. Dist=4,200 ly.
M17 Sgr Omega Nebula. Contains the star cluster NGC 6618. Dist=4,900 ly.
Magnitude – The brightness of a celestial object as it appears in the sky. M11 Sct Wild Duck Cluster. Resembles a globular through binoculars. V-shaped. Dist=5,600 ly.
Open Star Cluster – A group of tens or hundreds of relatively young stars. M16 Ser Eagle Nebula. Requires a telescope of large aperture. Dist=8,150 ly.
M81 UMa Beautiful spiral galaxy visible with binoculars. Easy to see in a telescope.
Opposition – When a celestial body is opposite the Sun in the sky. M82 UMa Close to M81 but much fainter and smaller.
Planetary Nebula – The remnants of a shell of gas blown off by a star. M87 Vir Supergiant galaxy with supermassive black hole at its core. Dist=53.5 million ly.
γ Virginis Vir Superb pair of mag 3.5 yellow-white stars. Orbit=169 years. At their closest in 2005.
Universal Time (UT) – A time system used by astronomers. Also known as Greenwich M27 Vul Dumbbell Nebula. Large, twin-lobed shape. Most spectacular planetary. Dist=975 ly.
Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. The Evening Sky Map (ISSN 1839-7735) Copyright © 2000–2023 Kym Thalassoudis. All Rights Reserved.