The Evening Sky Map

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Sky Calendar – May 2021 http://twitter.com/skymaps M39

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h E ) SERPENS LEO t 19 First Quarter Moon at 19:12 UT. B (CAUDA) Arcturus Mel 111 Regulus H w O T n

T a M64 i MONOCEROS S T s n I O 19 Moon near Regulus at 22h UT (evening sky). s o M l i P a t A Denebola i O i Vindemiatrix s n M 23 Moon near Spica at 19h UT (evening sky). F M12 M48 o b E T p y M10 M87 H H s T E H t 26 Moon at perigee (closest to Earth) at 1:46 UT i e M5 F M l r l O A c e u (distance 357,311 km; angular size 33.4'). P R l w e E I g T S s . γ n N i T H E 26 Full Moon at 11:14 UT. Perigee only 9.5 hours earlier. b H C e i r E VIRGO Alphard E i c S s s H

26 Total Eclipse of the Moon begins at 11:11 UT and ends A d e T d M e . p , S E HYDRA c i i E at 11:26 UT. Mid-eclipse at 11:20 UT. Partial phases begin at A c t b M S e a I d r T T A H Spica D 9:45 UT and end at 12:52 UT. During totality the Moon will in β M104 E E C CRATER in N t L I P T I A D h C ” turn red-orange in color as it passes into the Earth’s shadow. I e e S R n E E s LIBRA 3242 T C k o A Light passing through the Earth’s atmosphere scatters into red T y y D I w r O R ta N Symbols N it i I h M4 l A T o T colors (same as sunset/sunrise) and reflects off the lunar surface. H h Antares s i “ R A s s E Galaxy T l CORVUS n C Y e a 26 Moon near Antares at 20h UT (midnight sky). O f SCORPIUS e N U t SE O f m S Double Star F o d R A o SW r A 29 Mercury 0.40° SE of Venus (17° from Sun, evening sky) at 4h UT. C t a E E o M83 h P . n lp P Variable Star B i A A E ts Mags. 2.3 and –3.9. G h IT IN e S Diffuse Nebula B ad A 31 Moon near Saturn (morning sky) at 4h UT. Mag. 0.6. Y . N U ZO SI I Planetary Nebula N OR G H More sky events and links at http://Skymaps.com/skycalendar/ TH V O- E ir -T Open Star Cluster S go N KY is . ZO All times in Universal Time (UT). (USA Eastern Summer Time = UT – 4 hours.) M h CENTAURUS sky RI Globular Star Cluster AP igh 5128 e HO T in th M O F th in RO IN e s tion F SAVE ON RECOMMENDED PRODUCTS • http://Skymaps.com/store D A out lla SKY B her nste T RIG n sk ω Cen t co IGH Star Magnitudes HT y. It SOUTH rges E N -1 0 1 2 3 4 • Star Atlases & Planispheres • Star Charts & Astro Posters STA is the ond la TIR R PA largest the sec E EN TTER zodiac constellation and S TH Copyright © 2000–2021 Kym Thalassoudis. All Rights Reserved. • Books for Sky Watchers • Telescopes & Binoculars N IN SHOW THE SKY KY MAP All sales support the production and free distribution of The Evening Sky Map. . INSTRUCTIONS: THE S * TERMS OF USE: FREE FOR NON-COMMERCIAL EDUCATIONAL USE. ASTRONOMY EDUCATION GROUPS MAY FREELY DISTRIBUTE PRINTED HANDOUTS. FULL DETAILS AT http://Skymaps.com/terms.html About the Celestial Objects Easily Seen with the Naked Eye Listed on this page are several of the brighter, more interesting celestial objects Capella Aur The 6th brightest star. Appears yellowish in color. Spectroscopic binary. Dist=42 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. Procyon CMi Greek name meaning "before the dog" - rises before Sirius (northern latitudes). Dist=11.4 ly. grouped into three categories. Those that can be easily seen with the naked eye (that δ Cephei Cep Cepheid prototype. Mag varies between 3.5 & 4.4 over 5.366 days. Mag 6 companion. is, without optical aid), those easily seen with binoculars, and those requiring a 2021 MAY Deneb Cyg Brightest star in Cygnus. One of the greatest known supergiants. Dist=1,400±200 ly. telescope to be appreciated. Note, all of the objects (except single stars) will Castor Gem Multiple star system with 6 components. 3 stars visible in telescope. Dist=52 ly. appear more impressive when viewed through a telescope or very large Pollux Gem With Castor, the twin sons of Leda in classical mythology. Dist=34 ly. binoculars. They are grouped in this way to highlight objects that can be seen using α Herculis Her Semi-regular variable. Magnitude varies between 3.1 & 3.9 over 90 days. Mag 5.4 companion. Regulus Leo Brightest star in Leo. A blue-white star with at least 1 companion. Dist=77 ly. the optical equipment that may be available to the star gazer. Vega Lyr The 5th brightest star in the sky. A blue-white star. Dist=25.0 ly. Antares Sco Red, supergiant star. Name means "rival of Mars". Dist=135.9 ly. Tips for Observing the Night Sky Polaris UMi The North Pole Star. A telescope reveals an unrelated mag 8 companion star. Dist=433 ly.

NORTHERN HEMISPHERE Spica Vir Latin name means "ear of wheat" and shown held in Virgo's left hand. Dist=250 ly. When observing the night sky, and in particular deep-sky objects such as star clusters, nebulae, and galaxies, it’s always best to observe from a dark location. Avoid direct Easily Seen with Binoculars light from street lights and other sources. If possible observe from a dark location M44 Cnc Praesepe or Beehive Cluster. Visible to the naked eye. Dist=590±20 ly. away from the light pollution that surrounds many of today’s large cities. M3 CVn Easy to find in binoculars. Might be glimpsed with the naked eye. You will see more stars after your eyes adapt to the darkness—usually about 10 to μ Cephei Cep Herschel's Garnet Star. One of the reddest stars. Mag 3.4 to 5.1 over 730 days. 20 minutes after you go outside. Also, if you need to use a torch to view the sky Mel 111 Com Coma Berenices. 80 mag 5-6 stars in 5 deg. Dist=283 ly. Age=400 million years. map, cover the light bulb with red cellophane. This will preserve your dark vision. χ Cygni Cyg Long period pulsating red giant. Magnitude varies between 3.3 & 14.2 over 407 days. M39 Cyg May be visible to the naked eye under good conditions. Dist=900 ly. Finally, even though the Moon is one of the most stunning objects to view ν Draconis Dra Wide pair of white stars. One of the finest binocular pairs in the sky. Dist=100 ly. through a telescope, its light is so bright that it brightens the sky and makes many of M13 Her Best globular in northern skies. Discovered by Halley in 1714. Dist=23,000 ly. the fainter objects very difficult to see. So try to observe the evening sky on M92 Her Fainter and smaller than M13. Use a telescope to resolve its stars. moonless nights around either New Moon or Last Quarter. R Hydrae Hya Long period variable. Mag varies between 3.0 & 11.0 over 390 days. Brilliant red. ε Lyrae Lyr Famous Double Double. Binoculars show a double star. High power reveals each a double. R Lyrae Lyr Semi-regular variable. Magnitude varies between 3.9 & 5.0 over 46.0 days. Astronomical Glossary M12 Oph Close to the brighter M10. Dist=18,000 ly. Conjunction – An alignment of two celestial bodies such that they present the least M10 Oph 3 degrees from the fainter M12. Both may be glimpsed in binoculars. Dist=14,000 ly. IC 4665 Oph Large, scattered open cluster. Visible with binoculars. angular separation as viewed from Earth. 6633 Oph Scattered open cluster. Visible with binoculars. Constellation – A defined area of the sky containing a star pattern. M4 Sco A close globular. May just be visible without optical aid. Dist=7,000 ly. M5 Ser Fine globular star cluster. Telescope will reveal individual stars. Dist=25,000 ly. Diffuse Nebula – A cloud of gas illuminated by nearby stars. Mizar & Alcor UMa Good eyesight or binoculars reveals 2 stars. Not a binary. Mizar has a mag 4 companion. Double Star – Two stars that appear close to each other in the sky; either linked by Cr 399 Vul Coathanger asterism or "Brocchi's Cluster". Not a true star cluster. Dist=218 to 1,140 ly. gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in seconds of arc ("). Telescopic Objects ε Boötis Boo Red giant star (mag 2.5) with a blue-green mag 4.9 companion. Sep=2.8". Difficult to split. Ecliptic – The path of the Sun’s center on the celestial sphere as seen from Earth. M67 Cnc Contains 500+ stars mag 10 & fainter. One of the oldest clusters. Dist=2,350 ly. Elongation – The angular separation of two celestial bodies. For Mercury and Venus M94 CVn Compact nearly face-on spiral galaxy. Dist=15 million ly. the greatest elongation occurs when they are at their most angular distance from the η Cassiopeiae Cas Yellow star mag 3.4 & orange star mag 7.5. Dist=19 ly. Orbit=480 years. Sep=12". Sun as viewed from Earth. 5128 Cen Bisected by a wide obscuring lane. Strong radio source. Dist=14 million ly. M51 CVn Whirlpool Galaxy. First recognised to have spiral structure. Dist=25 million ly. Galaxy – A mass of up to several billion stars held together by gravity. CELESTIAL OBJECTS M64 Com Black-Eye Galaxy. Discovered by J.E. Bode in 1775 - "a small, nebulous star". Globular Star Cluster – A ball-shaped group of several thousand old stars. Albireo Cyg Beautiful double star. Contrasting colours of orange and blue-green. Sep=34.4". 61 Cygni Cyg Attractive double star. Mags 5.2 & 6.1 orange dwarfs. Dist=11.4 ly. Sep=28.4". Light Year (ly) – The distance a beam of light travels at 300,000 km/sec in one year. 3242 Hya Ghost of Jupiter. Bright blue disk. Mag 11 central star. Dist=2,600 ly. Magnitude – The brightness of a celestial object as it appears in the sky. M83 Hya Classic face-on spiral. Discovered in 1752 by Lacaille. In attractive star field. γ Leonis Leo Superb pair of golden-yellow giant stars. Mags 2.2 & 3.5. Orbit=600 years. Sep=4.4". Open Star Cluster – A group of tens or hundreds of relatively young stars. β Lyrae Lyr Eclipsing binary. Mag varies between 3.3 & 4.3 over 12.940 days. Fainter mag 7.2 blue star. Opposition – When a celestial body is opposite the Sun in the sky. M57 Lyr Ring Nebula. Magnificent object. Smoke-ring shape. Dist=4,100 ly. M81 UMa Beautiful spiral galaxy visible with binoculars. Easy to see in a telescope. Planetary Nebula – The remnants of a shell of gas blown off by a star. M82 UMa Close to M81 but much fainter and smaller. Universal Time (UT) – A time system used by astronomers. Also known as Greenwich M87 Vir Supergiant galaxy with supermassive black hole at its core. Dist=53.5 million ly. Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. M104 Vir Sombrero Galaxy. Almost edge-on spiral galaxy. Protruding central core. γ Virginis Vir Superb pair of mag 3.5 yellow-white stars. Orbit=169 years. At their closest in 2005. Variable Star – A star that changes brightness over a period of time. M27 Vul Dumbbell Nebula. Large, twin-lobed shape. Most spectacular planetary. Dist=975 ly. The Evening Sky Map (ISSN 1839-7735) Copyright © 2000–2021 Kym Thalassoudis. All Rights Reserved.