Bright Galaxies for Dark Nights, Evening Mars, and Five Pre-Dawn Planets!
(Above: Markarian’s Chain of Galaxies, imaged here by Steve McKinney of Toronto, lies in the northeastern sky between the stars Denebola and Vindiamatrix. This image covers more than two degrees of the sky, or four full moon diameters. The galaxies are a mixture of formless ellipticals and spirals - some seen edge-on to Earth.)
Hello, Stargazers!
Here are your Astronomy Skylights for the week of March 31st, 2019 by Chris Vaughan. Feel free to pass this along to your friends and send me your comments, questions, and suggested topics. I repost these emails with photos at http://astrogeoguy.tumblr.com/ where all the old editions are archived. You can also follow me on Twitter as @astrogeoguy! Unless otherwise noted, all times are Eastern Time. Please click this MailChimp link to subscribe to these emails. If you are a teacher or group leader interested joining me on a guided field trip to York University’s Allan I. Carswell Observatory or the David Dunlap Observatory, visit www.astrogeo.ca.
I can bring my Digital Starlab inflatable planetarium to your school or other daytime or evening event, visit DiscoveryPlanetarium.com and request me. We’ll tour the Universe together!
(Above: Bode’s Nebula, also known as the galaxies designated Messier 81 (at left) and Messier 82 (at right), were captured by Armand Pede of Toronto in this image. The two galaxies are about one full moon diameter apart in the sky.)
Public Astro-Events
Taking advantage of dark moonless evening skies this week, astronomers with the RASC Toronto Centre will gather for dark sky stargazing at Long Sault Conservation Area, northeast of Oshawa on (only) the first clear evening (Monday to Thursday) this week. You don’t need to be a RASC member, or own any equipment, to join them. Check here for details and watch the banner on their homepage or their Facebook page for the GO or NO-GO decision around 5 pm each day.
Every Monday evening, York University’s Allan I. Carswell Observatory runs an online star party - broadcasting views from four telescopes/cameras, answering viewer questions, and taking requests! Details are here. On Wednesday nights they offer free public viewing through their rooftop telescopes. If it’s cloudy, the astronomers give tours and presentations. Details are here.
At 6:30 pm on Tuesday, April 2, the Danforth/Coxwell Library will present a free public talk entitled Being an Astronaut Candidate by Dr. Ele Willoughby. Check here for details.
On Wednesday evening at 7 pm, the Perimeter Institute in Waterloo, Ontario will present a free talk and webcast by Professor Chad Hanna entitled Windows on the Universe, about multi-messenger astronomy. Details are here.
On Thursday, April 4, starting at 7 pm, U of T’s AstroTour will present their planetarium show Grand Tour of the Cosmos. Tickets and details are here.
On Friday evening at 6 pm at York University, CRAM Toronto will host a free public presentation by Professor Lawrence Harris on the effects of gravity (and the absence of it) on human physiology. Details are here.
On Friday, April 5, starting at 7 pm, U of T’s AstroTour will present their planetarium show Grand Tour of the Cosmos. Tickets and details are here.
On Friday evening, April 5 at 6 pm at University of Toronto St. George Campus, CRAM Toronto will host a free public presentation by Professor Keith Vanderlinde on radio astronomy and the expanding universe. Details are here.
On Friday evening, April 5 at 10 pm at University of Toronto St. George Campus, CRAM Toronto will host a free public presentation by Matt Russo on how Sonic Space Exploration Reveals the Voice of the Universe. Details are here.
If it’s sunny on Saturday morning, April 6 from 10 am to noon, astronomers from the RASC Toronto Centre will be setting up outside the main doors of the Ontario Science Centre for Solar Observing. Come and see the Sun in detail through special equipment designed to view it safely. This is a free event (details here), but parking and admission fees inside the Science Centre will still apply. Check the RASC Toronto Centre website or their Facebook page for the Go or No-Go notification.
(Above: The western early evening sky, shown here on Monday at 8 pm local time, features Mars near the tight cluster of blue stars known as the Pleiades. Later this week, Mars will move higher than the cluster.)
The Moon and Planets
This is the week of the lunar month when our natural satellite swings towards, and then past the sun, leaving our night time skies darker - just in time to hunt for spring galaxies!
The moon will begin the week as a beautiful old crescent on Monday morning, sitting less than a fist’s diameter to the right of bright Venus. Both objects will be low in the eastern pre-dawn sky. On Tuesday morning, the moon will shift eastward to sit below Venus – and then the moon will become lost from view until after the New Moon phase officially occurs on Friday morning. The next chance to see the moon, now a young crescent, will come in the western sky on Friday after sunset, and the weekend beyond.
Mars will continue to be an easy planet to see every evening this week, but only for a couple of hours after dusk. Mars will set in the west before 11 pm local time, so you are better off to seek it out right after full dusk. Once the sky has darkened, look for Mars as a medium-bright, reddish pinpoint of light one-third of the way up the western sky. Mars has been slowly shrinking in size and brightness as we increase our distance from it little-by-little. By the way – during the opening nights of this week, Mars will continue to remain near the bright open star cluster known as the Pleiades, the Seven Sisters, and Messier 45. But the Red Planet will slide farther from that clump of blue stars every night.
(Above: Five planets occupy the eastern pre-dawn sky this week, as shown here on Tuesday at 5 am local time, when the waning crescent moon will join them. Mercury will be a challenge to see, and distant, dim Neptune even harder!)
Very bright Jupiter has been catching the eye in the southern sky before dawn for some time. But this is the last week for it to be considered a pre-dawn object, because next week it will begin to rise before midnight.
The king of planets will rise shortly after midnight local time. By 5 am, it should still be visible in the sky over the southern horizon. Yellowish Saturn will rise at about 2 am local time this week - but, being dimmer than Jupiter, it will become lost in the southeastern twilight after about 5 am. Look for Venus as a very bright starlike object sitting very low over the east-southeastern horizon from 4:30 am local time until sunrise. Unlike airplanes, Venus will shine with a steady, unblinking light, and it won’t drift across the sky.
Finally, for a challenge, look for Mercury sitting very low over the eastern sky at about 5 am local time. And on Wednesday morning, distant Neptune will sit less than a pinky finger’s width below Mercury.
(Above: The Pinwheel Galaxy and the Whirlpool Galaxy flank Alkaid, the tip of the Big Dipper’s handle, which will be standing upright after dusk in early April. These two galaxies can be seen in binoculars under very dark skies.)
Bright Galaxies for Dark Nights
In late evening during early April every year, the Big Dipper stands upright in the northeastern sky. The bright star Alkaid marks the tip of its handle. The Pinwheel Galaxy is a spectacular, large face-on spiral galaxy, also designated as Messier 101, sits a palm’s width to the left (north) of Alkaid, forming an equilateral triangle with Alkaid and Mizar, the star at the bend in the dipper’s handle. Although relatively bright and close to us (21 million light-years away), the Pinwheel Galaxy is fairly dim because its light is spread out over a large patch of sky. It’s actually as wide as the full moon!
(Above: The Whirlpool Galaxy and its smaller companion are beautiful and relatively easy targets. This image by Ian Wheelband was captured near Collingwood, Ontario in 2016.)
Searching about four finger widths (3.5°) from Alkaid in the opposite direction, you will come to the iconic spiral Whirlpool Galaxy, also known as Messier 51. This galaxy’s angular size (diameter in the sky) is much smaller, but it will appear brighter in your telescope. It also features a secondary galaxy core. The two galaxies are linked by a bridge of material.
Draw a line diagonally across the dipper’s bowl by connecting the stars Phecda to Dubhe, and then extend that line by an amount equal to their separation. There you will find Bode’s Nebula, otherwise known as Messiers 81 and Messier 82. M81 is a magnitude 6.9 spiral galaxy oriented not quite face-on to Earth, making it larger and brighter than M82. M82, located half of a degree to the north of M81, is smaller, but brighter due its nearly edge-on orientation. Several other fainter galaxies can be found within a few degrees of Bode’s Nebula.
For a bonanza of galaxies, aim a telescope at the sky midway between the stars Denebola, which marks Leo’s (the Lion) tail, and Vindiamatrix, the star that marks Virgo’s (the Maiden) left arm. This is the heart of the Virgo Cluster of galaxies. Dozens of brighter galaxies populate this area of the sky, including a curved row of them more than two finger widths long known as Markarian’s Chain. Those galaxies are also sitting about three fist diameters to the right of the very bright star Arcturus in Bootes (the Herdsman).
(Above: The enormous Virgo Cluster of galaxies lies between Virgo and Leo, to the right of the bright star Arcturus. Each coloured oval represents a galaxy. The Big Dipper is off the image at upper left.)
Some Gemini Gems
If you missed last week’s information about objects in the zodiac constellation of Gemini (the Twins), I posted it here with a sky chart.
Keep looking up, and enjoy the sky when you do. I love questions and requests - so, send me some!
