The O-TEAM: A Thousand and One Nights - Part 2

Once upon a time, at a tiny cul-de-sac, in the village of North Falmouth, Cape Cod, Mass -

"This morning - was something to remember"...

So the note goes, written in pencil, on an official Edmund Scientific observing notes template, on the warm, sunny morning of 8 May 1983, by one, Mike Petrasko - one-third, of that notorious 3-member "gang" of optical aficionados, the "O-Team".

But, I think the tone of the note, was an understatement;

as observing sessions go, this one was outstanding, on several accounts! We had a guest for this session, a friend of Mike's, Shawn, who had never really had an opportunity, before this, to observe the sky with a telescope (and - he may not have, since!)

I arrived, on location, at around 2:00am. The others - Mike, Muir, and Shawn, were just waking from a short night's sleep, camped out at the center of an unused, undeveloped, someday-to-be, cul-de-sac neighborhood called, "Camelot Court", in North Falmouth, Mass. We had chosen this location for its proximity, open view of the sky, and, for its relative isolation from outdoor lighting - and other, unwelcomed intrusions.

In the span of 3 hours of telescope time, we had assessed, 5 Messier objects, an unknown open cluster, an unknown globular cluster (to us, at the time), and 8 sporadic meteors.

The wee hours of the night present some of the best opportunities for the amateur observational astronomer: fewer episodes of sporadic lighting, fewer people, less traffic, increased meteor activity, and, most of all, quiet.

M57, The Ring Nebula in Lyra imaged on ATEO-1 processed by Utkarsh Mishra (left), and M27, The Dumbell Nebula in Vulpecula imaged on ATEO-1 processed by Michael Petrasko (right).

Our, "optical ambush", begins with M57 - the "Ring" nebula, in Lyra. Though this emission nebulosity does, indeed, appear ring-like through the eyepiece, that is an illusion of perspective. This structure is, in reality, a spherical shell of excited gas molecules, outlining the shock bow from a centralized supernova event. M56, to me, has always appeared to be, a lone "Cheerio", floating in the darkness! It sits, almost squarely, between the two, lower corner stars of the "lyre" shape, Gamma and Beta Lyrae. It can be observed well with a 4" telescope.

The next object was M27, in Vulpecula - the "Dumbbell" nebula.

This, also, can be seen easily in a 4" inch scope. I know this, because Mike had a 4" Edmund Scientific Astroscan, at the time, and usually found these objects before I did. It is a twin-lobed remnant, also of a supernova. Burnham's Celestial Handbook describes it as, "large and shining", at several times the size of M57. About then, we broke out some nutrition to keep up our ambitions: "Nutty Bars", "M&M's" (plain), and a bag of "Doritos". Now, there's some "energy food"!

Edmund Scientific's Astroscan 4" f/4.2 reflector telescope (left) with the original observing log entry this post was adapted from back on May 8th, 1983 written by Insight Observatory Co-Founder Michael Petrasko when he was 17 years old. Image credits: Astroscan - Glenn Votava, Observers Log - Dale Alan Bryant.

Next on our list was M13 - the Hercules cluster (globular cluster, not referring to the cluster of galaxies within that constellation). Easily seen in good binoculars, this is one of my favorite collections. Of stars, that is. A nearly, perfectly symmetrical, uniformly dense, globe-shaped cluster of stars within the halo of globular clusters that orbits the Milky Way galaxy. Well, that's a technical description – but, see it for yourself, and you'll likely choose other, more prosaic wording, I'm sure of it.

M11 - is an open star cluster in the constellations Scutum. Open star clusters are loose congregations of stars, bound together, gravitationally, as are globular clusters, only, not as tightly. It's commonly called, the "Wild Duck" cluster (for reasons I never quite grasped). I have a favorite open cluster, not on this list: the double cluster, NGC'S 864 and 889, in Perseus. At over 7,000 light-years, the stars in the cluster appear as tiny, brilliant, and colorful jewels.

M13, The Great Hercules Globular Cluster imaged on ATEO-1 processed by Utkarsh Mishra (left), and M51, The Whirlpool Galaxy in Canes Venatici imaged on ATEO-1 processed by Michael Petrasko (right).

Next up, M51 - the "Whirlpool" galaxy. M51 is another "Grand Design" spiral galaxy, in reference to its near-perfection. Actually, it's an interactive pair of galaxies - the larger one, slowly consuming the smaller of the two. Located in Canes Venatici, its brightness and relative isolation in the darkness make it an easy target for small scopes.

As for the unknown open and globular clusters, I could only guess at what they would have been; likely, something in Ophiuchus - an area, rich, in such wonders.

And that leaves eight meteors; possibly, or not, connected to the Eta Aquarid meteor shower. Meteors are a fascinating subject, all on their own. The months of April and May have, historically, produced some very large fireballs and bolides, in historic times. Ask Mike or me, about that, sometime!

Dale Alan Bryant
Senior Contributing Science Writer

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Northern Hemisphere Forecast for April and May: Showers - With A Chance Of Bolides!

This time of year, presents us with a unique, "all-sky", observing situation: double-header meteor showers - and, the possibility of 'fireballs', and/or, 'bolide' meteors, thrown in!

First comes the Lyrid meteor shower, peaking on 22APR and followed by the Eta Aquarids, peaking on 5MAY.

Ah-Ha! But - the bases are loaded...

There is also, a good chance, for spotting a 'fireball' meteor or two, and, even a "near-once-in-a-lifetime" bolide. This annual recurring situation is where the term, "April Fireballs" comes from (see my article, "The Great Fireball of 1966").

A meteor from the Lyrids meteor shower crossing the milky way - single exposure. Image credit: iStock by Getty Images.

Lyrid meteors originate with the short, long-period comet, C/1861 G1. This comet has one of the shortest periods of all, long-period comets, at just over 400 years. Therefore, its 'wake' is broad and rather dense. Zenithal Hourly Rates (ZHR), are only around 10, for most years - but, with meteor showers, one can never tell. The Lyrids have provided, in, roughly, 60-year outbursts, up to 90 meteors, per hour! The Lyrid radiant in Lyra is close to that constellation's brightest star, Vega, which rises around 8:30 p.m., in the east.

The Eta Aquarids, peaking on 5MAY, is the debris train, left, by the 76-year period comet, 1P/Halley (yes, that one - "Halley's Comet", for you newcomers (oh, you'll learn!))

The Eta Aquarids radiant rises at around 2:45 a.m. and the hour or two just before dawn will be the best viewing (That's what you get for becoming an Astronomer!) The Eta Aquarids occur, this year, near the full moon - but a full moon was never a deterrent to me, for a meteor shower. And, there is assistance at hand...

Meteor showers are the type of event that, you don't want to use a telescope at; at least, not for watching meteors. Typically, meteor showers are viewed with the unaided eye. Some observers will use, low powered, standard-style binoculars - I've tried that myself and, probably, missed, half of the meteors during a shower, by constricting my field of view in using them!

Orion 2 x 54 Ultra Wide-Angle Binoculars

Orion Telescopes and Binoculars have come up with a unique-sounding aid directed at the meteor shower, and, Milky Way density viewer: Orion 2 x 54 Ultra Wide-Angle Binoculars! Somebody finally did it!

Although I haven't tried these, for myself, I get it -- I've imagined similar optics in my, "deep-astronomical" past (around 50 yrs., total!)

Rather than missing out on some meteors by using the confined field of a standard pair of binoculars - these 2x54 ultra-wides sound, more like, an enhanced, 'unaided-eye' field of view, with their offering of a 36° FOV, and 70°, apparent field of view. I can only imagine what the denser portions of the Milky Way look like through these!

IF YOU DO HAPPEN ACROSS A BOLIDE – LET ME KNOW ABOUT IT!

Dale Alan Bryant
Senior Contributing Science Writer

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"Hey Rocky - Watch Me Pull an Asteroid Out of My Hat!"

In Feb of 2012, Earth collided with a 65ft. in diameter asteroid, which exploded over the Russian town of Chelyabinsk. We all know the fortunate outcome there--they were extremely lucky, in that, the sonic boom, created by the disintegrating rock (at a height of 15 miles as it careened through our atmosphere toward the ground at 45,000 miles per hour), caused thousands of injuries, partially demolished buildings and shattered windows. Had the asteroid entered the atmosphere at a steeper angle, the results would have been catastrophic.

This is the trail of the Chelyabinsk asteroid which exploded about 14 miles above the ground
with a force nearly 30 times more powerful than the Hiroshima atomic bomb in 2013.
Credit: Neuromainker via YouTube/Screenshot by Irene Klotz for Discovery News.

And we never saw it coming. This meteor snuck right upon us from the direction of the sun, out of sight in the blinding light of day, as if some celestial magician had pulled it out of a hat--then threw it at us.

But, guess what? There's more to this celestial magic act...  

Let's start here...

This past April, Earth's orbit intersected the orbit of an asteroid debris field--the debris train, left in the wake of an orbiting, cometary, or, asteroidal body. This particular field is several times the Earth's diameter, and we were right in the thick of it for the entire month of April, as well as the end of March and the beginning of June. Earth's atmosphere encounters this field, and others somewhat like it, on occasion, every April, which, due to the pull of gravity produces 'fireballs' (unusually bright) and 'bolides' (exploding) meteors. But, parts of the field have been increasing in density over time.

Astonishingly, we've had 16 near-misses by asteroids, since January of this year, some within just a quarter of the distance to the moon, and one, actually, at an altitude of less than our GPS satellites! Most of these objects were just a few meters across, with the exception of one, which was a few kilometers in diameter!

So, is this kind of thing common? Could we experience another collision, similar to the Chelyabinsk event?

Well, it isn't a matter of, "If". Rather--I'm afraid--it's a matter of "When". And, that's not just an 'alarmist'' opinion, either; here's the deal:

Space--particularly interplanetary space--is not, entirely, empty. At any given time, there is an assortment of asteroidal and cometary debris surrounding the Earth, and in its orbital path around the Sun. Most of this debris is particulate. But, the process of the formation of our solar system, left behind a wide range of sizes of fragmented rock and iron. In our immediate neighborhood, there are asteroids composed of this material ranging in size from bits of dust, to rocks---to boulders---to school buses---even to 5-story apartment buildings! The Chelyabinsk meteorite was the size of the latter. And, there are a few asteroids out there--- the size of small moons!

On an average day, Earth's atmosphere encounters two basketball-sized asteroids. In any two-week period, we get slammed, by one SUV-sized asteroid. Some burn up, entirely in the atmosphere--and, some, make it to the ground.

In the early days after the formation of our solar system, there was much more of this material, which ended up on the surfaces of Earth and the moon and other planets. Here on Earth, the processes of weathering and erosion have erased most of the evidence for those impacts. However, there is plenty of left-over for orbital physics to play with.

Earth--and, ourselves--are moving through space, on our annual revolution around "Sol", our star--our sun (counterclockwise, viewed from the Sun's North Pole), at a speed of 33,000 mph. At the same time, we're rotating on our axis, eastward, at a speed of 1,000 mph.

Here's a very fitting analogy: We're driving down the freeway, blindfolded--with the pedal to the floor; eventually, we're going to crash---unless we can prevent it from happening, altogether, with an early detection/warning and response system.

Become a member of the NASA Center for Near-Earth Object Studies (CNEOS), a program that keeps track of these objects by monitoring and plotting their positions, trajectories, and velocities. You could--literally--save the world.

**The title, some of you may remember, is a take-off on the 60's cartoon style, "Rocky and His Friends" ("Bulwinkle" was, undoubtedly, his closest!).

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