GAAC Program Note -- May 10 Meeting

At our May 10 meeting, Amateur astronomer and perennial GAAC favorite Dwight Lanpher will speak about his visit last September to Birr Castle, County Offaly, Ireland to examine "the Great Telescope." Any review of the history of astronomy will likely discover this large telescope called the "Leviathan of Parsonsonstown." Built in Ireland in 1845 by the 3rd Earl of Rosse, it was the largest telescope in the world for 70 years. Each of two 72" speculum-metal mirrors were alternately mounted in a 54' long tube, suspended between two purpose built castle walls.

Dwight's dynamic presentation will show details of how the telescope was operated and the modifications that were made during a $1,200,000 renovation in 1995. Images will also include the last remaining of the two, 3-ton, speculum mirrors examined during the return trip at its current location at the Museum of Science in London.

When not visiting ancient telescopes, Mr. Lanpher travels throughout New England and eastern Canada attending astronomy meetings as liaison for clubs in Maine, New Hampshire and a few, including GAAC, in Massachusetts, and observing at their star parties when the opportunity avails. Professionally, Mr. Lanpher works as an Electrical Engineer.

This will be a fun, informative meeting, full of large telescopes, a large chocolate cake, and large but thoroughly graspable ideas. We hope to see you there!

David Levy's Skyward -- April 2019

Skyward, April 2019

During our monthly star nights at our neighborhood Corona Foothills Middle School, I sit down on a chair near the telescope to assist with the observing. The students attending are well behaved no matter their level of interest.  Some of the kids are there just for the evening’s assignment.  But occasionally one student or two will sit down next to me and ask me a few questions. 

They don’t have to do this.  They may ask how I got started in astronomy, in a time without computers, or even what my favorite planet or comet is.  I love these conversations.  They signify to me that the girl or boy is developing an interest in the sky, and an inquiring mind is at work that is so rare and precious these days.  That interest and curiosity may go nowhere; it may persist for a few months, or it may go everywhere.

Why are relatively few young people getting into astronomy? Is it because almost no astronomy is taught in schools these days?  Too much TV?  The internet?  Or are astronomy clubs failing to reach the young people of tomorrow? I would say all of these.  Or more to the point, none of these.  When I became interested in the night sky at the age of 12, there were even fewer astronomy lectures in school than now.  I went into astronomy partly because it offered me a reprieve from the lack of friends I had as a child—I was very shy.  And I embraced it because of an increasing innate love of the night sky.  I knew nothing, but that’s all that was needed.

Now, Wendee and I are offering youngsters a chance to inquire about the night sky.  Even if that interest is sparked among only a few, it doesn’t really matter.  Our attempt might have succeeded with one child.  Or five.  But it did succeed.  The way I see it, we cannot force a child to develop an interest in anything.  The spark that sets off a curiosity, even a lifelong curiosity, must come from the child.

I might have developed an acquaintance with astronomy partly because I was searching for an interest that did not involve having to make friends. But my passion for the sky came from the sky itself and its complement of worlds, suns, and galaxies. After many years, I have made lots of friends, most of whom also love astronomy, but in a way it doesn’t matter.    What began as something to avoid friendship has evolved into one of the friendliest and happiest things I’ve ever done, a lifelong friendship with the starry host that brightens our nights.

Picture Caption: "This picture shows me demonstrating Voyager, our Meade 14-inch diameter reflector telescope, to one of the students."

Skyward -- March 2019

David Levy

Skyward, March 2019

  If you have read this column more than once, you probably are not too surprised to understand that I love comets.  Comets are a part of me, a part of who I am. 

But I had to wait a while before I saw my first comet.  I was already 17 years old and had been interested in the sky for a number of years.  When I learned that the two young Japanese amateur astronomers Kaoru Ikeya and Tsutomu Seki had discovered a comet that could become the comet of the century, I was spellbound.  During the mild autumn of 1965, as I awaited this mighty comet, I decided to begin a comet search program of my own. 

At the end of October I finally saw this comet as it rose, tail first, in the sky to the east beyond the St. Lawrence River.  I observed it again a week later in early November.  I have never forgotten it, even as, in later years, I finally was able to correspond with the comet’s two discoverers.   Their comet did become the brightest comet of the 20th century, and my own program, after many more years of searching,  was successful.

To me, comets are as personal as almost anything in my life.  I have discovered or co-discovered 23 of them, but my favorite is Comet Hyakutake. (prounounced Yah-koo-tah-key.)  This comet provided everything a great comet should:  it was big, it was bright, and its tail stretched majestically across the sky.  I followed the tail one night from Polaris, the north star, all the way past Corvus in the far southern sky.  When I reported my observation, a professional astronomer wrote to me that it was simply impossible for the tail to be so long.  In order for that to happen, the tail would have had to stretch from Earth past Jupiter.  A few years later, scientists studying the data from the Ulysses space probe identified its detection of the tail at the orbit of Jupiter, and the astronomer confirmed what I saw.

There is one other aspect that I can write about Comet Hyakutake.  Between the time it passed so close to the Earth and the time it passed close to the Sun a couple of months later, Wendee and I were growing closer.  One evening as we were driving home to Arizona from Las Cruces, New Mexico, I pulled over, turned off the car, and we enjoyed the comet together as it was ner its perihelion, or its cloest point to the Sun.  It was the first time Wendee saw a comet.  She saw another one, Hale-Bopp, the next year on our wedding night. And on October 3, 2006, she saw a third comet, one I had discovered the previous morning.

Oh, how I wish that more young people could capture this love of the night sky.  Maybe soon another bright comet will pay us a visit, and a young teenage girl or boy will look up, watch it wander lazily across the sky, its tail pointing off in some direction, and maybe this comet might inspire that young person to learn about the night sky that is so much a part of us.

Picture Caption: Halley's comet, taken with the 61-inch telescope at Mount Bigelow, near Tucson, Arizona.  The image clearly shows a bright tailward jet of dust emanating from the nucleus.  Picture by Steve Larson and David Levy.

David Levy's Skyward

Skyward
March 23

In 1963, while living as a patient at the Jewish National Home for Asthmatic Children in Denver,  I strolled outside on the evening of March 23 to observe the evening sky.  The sky was brilliant and clear that evening so long ago as I set up my small first telescope, Echo, and proceeded to sketch a portion of the Milky Way as it shone in  the sky over Denver.  It was a silly and immature project of no particular value whatsoever, but it was important to me, and it resulted in a small chart of the winter Milky Way.

Over many years, the particular date of March 23 has brought many treasured  memories to my personal life and my skywatching life.   Late in 1988 I began studying the behavior of TV Corvi, a certain variable star that had been discovered in 1931 by Clyde Tombaugh, the same person who discovered Pluto. On the evening of March 23, 1990, TV Corvi erupted againlike a nova, brightening from fainter than magnitude 19 to magnitude 12, an increase of almost 250 times in brightness in just a few hours.    Even though it has gone through outburts of energy many times since then,  one of those outbursts also took place on another March 23.

All these events paled in contrast to what happened next.  On March 23, 1993,  Gene and Carolyn Shoemaker and I, while observing from Palomar Observatory, took the two photographs of a region of sky that led to our discovery of Comet Shoemaker-Levy 9.  Sixteen months later, the 21-odd pieces of that tidally disrupted comet collided with Jupiter, the largest planet in our solar system, in what is now regarded as the mightiest collision ever witnessed by humanity.  This event captured the attention, and the imagination, of the world, and was directly responsible for inspiring many people to become interested in the breathtaking majesty and behavior of the universe.   

The fact that my youthful map of the Milky Way, a new variable star, and one of the most interesting comets in the history of science (according to scientists around the world),  all began on March 23, left a most lasting impression on me regarding that special date.   In the nonastonomical parts of my own life, on March 23, 1992, I typed a postcard to Wendee Wallach, a teacher in Las Cruces, New Mexico.  It was my not very romantic way of asking her out on a date.  At the time it was just a coincidence that the letter was written on that particular date.  But five years later, it was not a surpise, therefore, that Wendee and I were married on March 23, 1997. 

There is a special reason that March 23 recurs in this way.  The various astronomical happenings associated with this date comprise not just a single part of astronomy, like a planet, a comet or a star that suddenly changes in bightness, but almost the whole gamut of what can happen in the sky, from a comet that collides with a planet, to a unique variable star, and on to the vast expanse of our galaxy across the night, and how all these things relate to the happiest parts of my personal life.  The date reminds me once again of how exciting and unexpected the night sky can be.

Nov 9 GAAC Program Note

This month we're pleased to have as our speaker Sarah Blunt from the Harvard-Smithsonian Center for Astrophysics. Sarah's presentation is titled "Know thy Star, Know thy Exoplanet."

Sarah's talk is based on the simple fact that nearly every known exoplanet has been discovered indirectly; that is, in order to detect and characterize the planet, we make measurements of its host star.

Because of these relationships, many exoplanet measurements have been limited by our knowledge of their stars at the time the planets were detected. In this talk, Sarah will discuss exoplanet discoveries that have now been made possible by more precise stellar data, and will introduce ongoing stellar research that has the potential to improve our understanding of exoplanets.

There are more planets out there than stars --  hundreds of billions just in the Milky Way alone.

See you there, 8 Vulcan Street in Lanesville, 8:00 pm on the 9th -- lots of good things to eat, lots of fun stuff to know, and great conversations to be had!

October 12 GAAC Meeting Program Note

At our Friday night October 12 GAAC meeting we are pleased to have with us Phil Orbanes, with "Tales from the Cosmic Dark Side," a Halloween-themed presentation illustrated with Phil's excellent astrophotos, touching on all sorts of dark objects -- Dark Nebulae (and Bok Globules), Molecular Clouds,  Integrated Flux Nebula, Dark (“Rogue”) Planets, “Dark Matter” and “Dark Energy.”

Calling on examples from the Pipe nebula through the possible eventual heat-death of the universe, Phil will elucidate the universe of dark phenomena all around us. We'll see you there, 8:00 pm at the Lanesville Community Center, 8 Vulcan St in Lanesville. There will be goodies of every stripe, friends old and new, and just a generally good time to be had for all.

September 14 GAAC Meeting Program Note

At our September 14 meeting we're pleased to have Charles Law, from the Harvard-Smithsonian Center for Astrophysics, with “From Young Stars to Planets: How to Make a Solar System.”

How did the Solar System form? This question has taken on increased significance with the discovery of a vast number of exoplanetary systems in the past two decades. Public and scientific interest in planetary science has also been piqued with NASA’s recent Juno and New Horizons missions to Jupiter and Pluto. Throughout the last decade, radio telescopes have been revealing exciting new results and deepening our knowledge of planet formation.

In an entertaining, colorful and educational presentation, Charles will outline our current understanding of the planet formation process, explore recent observational findings, and briefly touch on questions related to the origins of life and astrochemistry.

You definitely don't want to miss this one -- see you there, at the Lanesville Community Center, 8 Vulcan St, 8:00 - 9:30pm. A map is here.

GAAC July 13 Meeting -- Program Note

Friday night at 8:00pm, July 13, the Gloucester Area Astronomy Club is pleased to host Astronomy Magazine columnist and President of the Amateur Astronomy Makers of Boston, Glenn Chaple, with a presentation titled “Double Stars For Backyard Telescopes — Double Stars are TWICE the Fun!”

In the 19th century and early decades of the 20th, when refractors were the telescopes of choice, double stars were the favorite fare of amateur astronomers. With the discovery in the 1920s that the so-called “spiral nebulae” were actually distant galaxies and the emergence in popularity of the reflecting telescope, double stars took a back seat to deep-sky objects.

Light pollution has made it harder and harder to observe deep-sky objects, but double stars remain relatively unaffected by streetlights or the Moon. As a result, double stars are regaining popularity among backyard astronomers.

In a colorful and informative presentation, Glenn will explain the nature of double and multiple stars, discuss the history of double star astronomy, and offer hints on observing double stars with unaided eye, binoculars, or telescope. He’ll conclude with a look at a Top Ten double star list, the Double Star Marathon, and resources for the double star enthusiast; you’ll come away well-prepared for some double-star observing.

We’ll hope to see you on Friday July 13, from 8:00 to 9:30, for an evening of great snacks, great conversation, and a terrific presentation by a GAAC favorite.

GAAC meets on the second Friday of every month except August, at the Lanesville Community Center, 8 Vulcan Street in Lanesville. A map is here. There are no dues or fees, and the public is warmly invited. No special knowledge or equipment is needed to have a great time.