Some Light Science Reading. The Constellations: Camelopardalis

As first appeared in the June 2012 edition of the Syracuse Astronomical Society newsletter The Astronomical Chronicle.


Image generated with Starry Night Pro 6.

We continue our presentation of CNY circumpolar constellations with a relative newcomer to the great list of 88 constellations (in Western Culture, anyway). Camelopardalis the Giraffe is lucky to be identified as a constellation at all, as neither the Greeks nor the Romans saw this part of the sky as interesting enough to, dare I say, stick their necks out and define the stars here as anything of importance. Its Western history dates to approximately 1612, when the famed Dutch astronomer and cartographer Petrus Plancius (who also provided us with Monoceros, another recent constellation in the Northern Hemisphere) grouped the stars with the name Camelopardalis which, loosely translated, breaks down into “camel” and “leopard,” the combinations of “long neck” and “spots” being a reasonable first approximation to the features of an animal most of Europe had likely never seen at the time. The Chinese and Indian astronomers, on the other hand, were far more meticulous in their use and definition of stars in the Night Sky and the brighter stars in Camelopardalis are all defined in one asterism or another. The positions are obviously the same, but the history and mythology of the stars in Camelopardalis are markedly different.

Referring back to the main image in my first article on circumpolar constellations (Ursa Minor, Jan/Feb/Mar 2012, above), that vast majority of Camelopardalis lies above the Northern Horizon, with its head region tightly packed between the boundaries of Draco and Ursa Minor. I’ve seen several stick figure representations of Camelopardalis that attempt to depict only the legs (from the brightest stars in the constellation), only the legs and torso (by cutting Camelopardalis off at the knees and connecting these two starts to make a body), only the legs and half the neck (using bright stars again), the legs and full neck (getting a head in there as well), and the full-on head-neck-torso-short-leg variation that looks most like a giraffe but, likely, deviates most from classical definitions. The correct line drawing for you is, of course, the one that helps you identify the constellation easiest.

During the June mid-evenings, Camelopardalis is oriented with its feet standing firmly on the Northern Horizon (perhaps with its legs obscured behind tall trees that serve as celestial underbrush during our observing sessions). With no star brighter than 4th magnitude and most in the 4th to 5th range, one does have to work a bit harder than usual to mark out the legs and torso of Camelopardalis from Darling Hill, as the electromagnetic diaspora emanating from Syracuse consumes an ever-increasing expanse of the Northern Sky (a solution, then, is to simply observe from somewhere comfortably North of Syracuse!). As you check for the neck, consider the head of Camelopardalis reaching for the bowl of the Big Dipper. The brightest star near where the head would be, the appropriately named “HIP47193,” will sit just to the left of Polaris for your early-night June observing.

Neither the Greeks, nor the Romans, nor most any Western Culture, nor Charles Messier or his assistant Pierre Méchain found anything of importance to amateur astronomers among the stars we know as Camelopardalis. It took until the 18th century for William Herschel to identify an object worthy of cataloguing in the forms of the sort-of elliptical/sort-of spiral galaxy NGC 2403 (shown above, from Hubble). We now know that this region of the sky contains many interesting, but faint, observables, some of which lie within the Milky Way (such as the planetary nebula NGC 1501 and the open cluster NGC 1502) and many which lie far, far beyond, all likely visible only because they lie away from the galactic plane of the Milky Way (and, therefore, are identifiable because they are in a relatively barren stellar savannah that doesn’t obscure our view). Among these are NGC 2655, IC 342 (shown below in infrared from NASA WISE), and NGC 1569 (all exceptionally tough targets due to Syracuse light pollution).

– Happy Hunting, Damian

Some Light Science Reading. The Constellations: Canes Venatici

As first appeared in the March 2010 edition of the Syracuse Astronomical Society newsletter The Astronomical Chronicle (PDF).

Constellation Map generated with Starry Night Pro 6.

It often seems to me that the night is much more alive and richly colored than the day.
Vincent van Gogh to his brother Theo, 1888

If the Hubble Ultra Deep Field image has taught us nothing else, it is that every piece of the sky, regardless of how diminutive it may be in the two-dimensional view of the universe through our eyes, holds a wealth of astronomical treasures.  We begin the 2010 Constellation presentations with one such small, but by no means insignificant, piece of the sky.  Canes Venatici (“Now that’s Italian(-sounding)!”) is a young constellation, one of the many additions formalized by Johannes Hevelius in the 17th century and the result of some rather troublesome bookkeeping over the course of written history.  As the story goes, several of the stars within the modern borders of Canes Venatici were originally part of Bootes‘ staff (or club.  Some herdsmen take the protection aspect of their job very seriously).  A poor translation of Ptolemy‘s Almagest from Greek to Arabic to Latin resulted in the “hook” of the staff being turned into “dogs” (accordingly to the translation history provided at wikipedia, the translation went from “the spearshaft having a hook” in Arabic to “spearshaft having dogs” in Latin.  Perhaps the Arabic-to-Latin translation occurred on a late Friday afternoon before a much-anticipated Public Viewing session?). Befitting a new constellation of hunting dogs now accompanying Bootes in his nighttime watch, Hevelius, er, ran with it and gave the mythological canines Chara and Asterion a small but astronomically busy place next to their master.

The two dogs Chara (represented by the star “Chara”) and Asterion (represented by “Cor Caroli”) are identified by only their two brightest stars, which are themselves joined by a short leash in the modern line representation.  The many dimmer stars in this constellation that jump out even with low-power binoculars add multiple “spots” to the imagined bodies of these two dogs.  As they rush ahead of their master Bootes, they point straight towards the hindmost of Ursa Major (or appear to be running past the Big Dipper).  If celestial real estate is any measure of actual size in the ancient illustrations, the giant Ursa Major is right in aligning his gaze away from the two diminutive playful pups.  I’m sure there’s some imagined connection between Canes Venatici and its final bordering constellation Coma Berenices, but I was once told that the explanation can get a little hairy (if you did not recognize that as a poor pun, do read the wikipedia entry for Coma Berenices, which may find its way to a feature in upcoming newsletters).

If we let lying dogs rest for a moment, we find Chara and Asterion in possession of five Messier Objects, including a phenomenal telescope sight that is otherwise most often found by chasing Ursa Major’s tail.  The distance between M3 and M106 marks the total width of this constellation.  M3 (below) is an 8 billion-year-old globular cluster composed of 500,000 stars that rests roughly 1/3 the width of our galaxy from us (33,900 light years).


M3, from Robert J. Vanderbei.

M106 (below, from NASA/CXC/University of Maryland) is one of those distant (well, 25 million light years) galaxies that NASA astronomers have a field day with as they overlay various wavelengths to make visually stunning images.  The strong X-ray lines in its spectrum indicate that a supermassive black hole resides in this galaxy that is in the process of devouring large swaths of stellar and gaseous matter.


M106, from NASA/CXC/University of Maryland.

M94 (below), also known as the Cat’s Eye Galaxy, is a remarkable structure, as it contains two distinct spiral regions in one galaxy (providing the bright central pupil and the darker edges of the eye).  Speaking of two significant features in one, its discovery is attributed to Pierre Mechain and its cataloging by Charles Messier, occurring just two days later (pairs come in three’s?).  M94 is itself the most prominent member of the so-called M94 Group of Galaxies, a closely associated group of (up-to 24) galaxies within the much larger Virgo Supercluster.  Fourteen of these galaxies lie between 9.0 (M94) and 14.2 magnitude, making the search possible with available gear but only under most ideal viewing conditions.


M94, from Spitzer, GALEX and R. Jay GaBany.

The Sunflower Galaxy (M63, below) was one of the first galaxies to have a distinctive spiral quality associated with it (this by Lord Rosse in the mid-19th century).  The short and tightly spiraled arms pack considerable spectral density into a seemingly small space, providing the stem-free sunflower view that, as it contains tens of thousands of suns, might better be called The Galaxyflower.  M63 is a member of the M51 Group, another cluster of galaxies within the Virgo Supercluster that feature, as their crown jewel…


M63, from NASA and WikiSky.

The Whirlpool Galaxy (M51, below) is, perhaps, the third best view of any galaxy to be found at Darling Hill (the second-best being the Andromeda Galaxy (M31) and the first being, you guessed it, our own Milky Way).  We view the Pinwheel Galaxy looking straight down the rotation axis of the pinwheel, providing us with what can be a very clear view of the spiral structure of the galaxy through our scopes (and providing those with big scopes a very clear view of this structure).  I suspect not a single member with a non-GOTO scope has ever said “It’s over in Canes Venatici.”  Instead, I suspect the standard manner of location involves some instruction stating “Look at the last star in the handle of the Big Dipper and go at a right angle about half the distance of the last two stars in the handle.”  If you can see the famous pair Alcor and Mizar in the Big Dipper, you’re almost at M51 in a pair of binoculars.  The bright bulge at the end of one spiral arm is a true companion galaxy.  Computer models indicate that the distortions of the M51 arm at this companion position are a result of the companion galaxy passing through the plane of the M51 some 550 million years ago, as if M51 were in the process of throwing its companion out into the void to be retrieved by our two dogs.


M51, from NASA and ESA.

Lord Rosse, who also identified the spiral structure in M63, observed and sketched the clear spiral structure of M51 in 1845 (shown below).  The sketch he made reminds me of the center swirl within Vincent Van Gogh’s “Starry Night” (shown below).  And speaking of fine art, the Hubble image of M51 (provided as a massive download here) is one of those views that might well make the final cut in the first intergalactic exhibition.

The proverbial “Cat’s Meow” of nighttime viewing from a small pair of stars that mark a small pair of dogs that were spared from the celestial kennel thanks to a mistranslated description of a cudgel.

Clear skies, Damian

www.syracuse-astro.org
www.starrynight.com
en.wikipedia.org/wiki/Vincent_van_Gogh
en.wikipedia.org/wiki/Hubble_Ultra_Deep_Field
en.wikipedia.org/wiki/Universe
en.wikipedia.org/wiki/Canes_Venatici
en.wikipedia.org/wiki/Johannes_Hevelius
en.wikipedia.org/wiki/Bo%C3%B6tes
en.wikipedia.org/wiki/Ptolemy
en.wikipedia.org/wiki/Almagest
en.wikipedia.org/wiki/Canes_Venatici#History
en.wikipedia.org/wiki/Ursa_Major
en.wikipedia.org/wiki/Coma_Berenices
en.wikipedia.org/wiki/Charles_Messier
en.wikipedia.org/wiki/Messier_3
www.princeton.edu/~rvdb/images/NJP/m3.html
en.wikipedia.org/wiki/Messier_106
en.wikipedia.org/wiki/X-ray
en.wikipedia.org/wiki/Supermassive_black_hole
en.wikipedia.org/wiki/Messier_106
gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=ssc2007-06a
en.wikipedia.org/wiki/M94
en.wikipedia.org/wiki/Pierre_Mechain
en.wikipedia.org/wiki/M94_Group
en.wikipedia.org/wiki/Virgo_Supercluster
ssc.spitzer.caltech.edu/legacy
galexgi.gsfc.nasa.gov/docs/galex/surveys/NGS.html
www.cosmotography.com/index.html
en.wikipedia.org/wiki/Messier_63
en.wikipedia.org/wiki/Lord_Rosse
en.wikipedia.org/wiki/M51_Group
en.wikipedia.org/wiki/Messier_63
en.wikipedia.org/wiki/NASA
en.wikipedia.org/wiki/WikiSky
en.wikipedia.org/wiki/Whirlpool_Galaxy
en.wikipedia.org/wiki/Andromeda_Galaxy
en.wikipedia.org/wiki/Milky_Way
en.wikipedia.org/wiki/Mizar_%28star%29
en.wikipedia.org/wiki/Whirlpool_Galaxy
en.wikipedia.org/wiki/European_Space_Agency
en.wikipedia.org/wiki/Starry_Night

Syracuse Astronomical Society President’s Message For March, 2009 – The Messier Marathon Edition

A repost of the original at the Syracuse Astronomical Society website with a brief overview of our upcoming (weather-permitting) Messier Marathon.

Greetings Fellow Astrophiles!

This newsletter comes to you after a short run within the last ten days of almost perfect viewing conditions (ignoring the cold, of course, with the Vesper air reaching the high teens for long durations on a few occasions). We are now officially entering the SAS viewing season, with scheduled New Moon Public Viewing sessions until November (we will see how that plays out) and, we hope, many dark, clear nights in between.

The First Few “Unofficial” 2009 Sessions

The beginning of the viewing year at Darling Hill began this past March 13th, with Observatory Directory Ray Dague and I braving the Vesper elevation and residual ice at the driveway base to check the location and attempt some viewing on what turned out to be a crystal clear night. Despite all efforts (including an outside climb and feet-on-walls pulling. We undertook quite the comical effort just to put eyepieces in), the frozen Observatory roof decided it was too early to “officially” open. We settled for trusty binoculars, plenty of power for Messier warm-up searches and, high above in Gemini, Comet Lulin (which we had to double-check was not NGC 2420).

Board members frozen as stiff as boards.
From left: J. McMahon, J. Funk, D. Allis, G. Sigworth. Photo by Raymond Dague.

Additional viewing sessions/board meetings (such as the one captured above on March 20th) were just as clear and just as busy (but included an open Observatory roof!), due in no small part to just how infrequently we in CNY are able to make it outside during the winter for any viewing sessions because of both the cold above and, in the case of Darling Hill, driveway accessibility. For those who wanted to keep track, last year had nine scheduled public viewing sessions and only THREE that were clear enough to be productive. We are already well on our way to a record year and only hope that the gas prices remain low to keep the continual driving to Tully as inexpensive as possible. And, speaking of records…

Messier Marathon

Our early April 2008 Messier Marathon at Darling Hill was a complete overcast wash, with two hours of patience revealing three stars (we used the time to talk about gear, which itself is never a bad thing). It would be difficult to imagine a worse situation that didn’t include precipitation. With cautious optimism for the weekend, we now print out check lists and list object pages in our favorite star charts for MM-2009.

A Brief Overview

We are often visited at the Hill by people who may have heard of the “Mn” designation for an object in the Night Sky but do not know specifically what it refers to. If you’re learning about Messier objects in the context of a website post about the Marathon, then you may think the Marathon to be some kind of celestial relay race between fuzzy patches. Briefly, here are the 5 W-H’s about Messier and the Marathon.

Courtesy Thierry Lombry, www.astrosurf.com/lombry.

Who: The marathon owes its existence to Charles Messier who, by all accounts (and to the best of my google efforts), never engaged in what he would have simply referred to as “The Me Marathon.” Messier was a famed French comet hunter (the search for comets in the 17th and 18th centuries was THE original “Space Race,” as such discoveries were sure to bring fame and prestige) who, with his assistant Pierre Méchain, catalogued what we know today as the Messier Objects specifically because he wanted to avoid these confusing objects in his cometary searches. Yes, the man who dedicated his life to finding comets is now best known for the catalogue of non-comets he generated. C’est la vie.

What: The Messier Objects are simply a collection of clusters, nebulae, and galaxies that are visible through binoculars and low-power telescopes (and some are naked-eye objects). In effect, they are a collection of the “closest of the bright objects” that one might confuse with a comet, with the “closest/brightest” set including clusters and nebulae within the Milky Way and many galaxies far beyond our spiral arms. As massive, distant, and bright objects, they are stationary in the sky, making them easy for Messier to catalogue in his comet hunting efforts and, for us, making them useful guide posts both for their identification from Constellation markers and for the identification of far fainter objects based on proximity. There are 110 counted Messier Objects but, according to Pierre Méchain himself, only 109 actual objects, as M101 and M102 (the Pinwheel Galaxy) are the result of double-counting (on the bright side, when you’ve found it once, you’ve found it twice!). While the majority of the list goes back to Messier’s time, the last object added, M110, was included in 1960.

Charles Messier (1730 – 1817). Click HERE for more info.

Covering the second important “what,” the Messier Marathon is simply a fun way to see how well you know the “photons in your neighborhood… the ones you don’t know you see each night.”

Where: Up! Well, more specifically, up in the Northern Hemisphere. As a French astronomer, Messier’s catalogue contains only objects observable from his Observatory. Accordingly, all 110 objects are visible from Northern Latitudes. That means that (1) a multitude of objects in the Southern Hemisphere that WOULD have made the Messier list are not included because he simply could not point his scope into the ground to look at them and (2) those in the Southern Hemisphere do not engage in Messier Marathons as much as they engage in Messier Sprints, as they have fewer objects to identify (and, the further South they are, the shorter their list is).

The Pinwheel Galaxy (M101 – 102)

When: Members of the Messier list grace our skies all year, with nearly every Constellation visible in the Northern Hemisphere hosting at least one object. Only two things in the Night Sky can obscure Messier objects. The first of these is “whatever else you want to see” that keeps you from looking for the Messiers. The second is the Moon, which can, in fact, obscure the Messier objects considerably (those that are naked-eye Messiers then require binoculars to see, those that are binocular Messiers then require either patience or higher power).

There is one reasonably broad “sweet spot” in the calendar year during which it is POSSIBLE to see every Messier object, with the rotation of the Earth responsible for bringing the entire list to your tripod. This is, of course, only possible because clouds, the irregularity of the horizon (such as our trees to the South and Syracuse to our North), and your ability to remain awake all factor considerably in your success. This time of year is mid-March through early April.

Why: For the reason for the catalogue, see the “What.” For the reason for the Marathon, well, why not? Despite some criticism of the Marathon you can find online, the Marathon provides a way for amateur astronomers to test their memorization of positions in the Night Sky and, important to those of us in CNY, pull out our optics and dust off our notebooks after two or three winter months of missed practice. Again, the Messiers are not simply a set of goals for an observing session, they are invaluable tools as guide posts for the identification of other objects. If the Constellations are “feet” in an astronomical ruler, their associated stars and the nearby Messier Objects serve as the “inches.”

How: An experienced Messier hunter can find the complete set of objects in a pair of 10×50 binoculars. As the goal to some Marathoners is “quantity, not quality,” a low-power pair of binoculars are best for both speed and movement (although your neck will begin to object to objects at your zenith). If I may sneak in a “tortoise and hare” comparison, there’s nothing wrong with finding 20 objects and enjoying the view. You have ALL YEAR to complete your Marathon. They’re not going anywhere!

For the CNY SAS Members: If your goal is to spend from 8:00 pm to midnight outside, your best luck with Messier hunting by binoculars (that is, listing objects that will result in the least amount of neck fatigue) will find you pointing to the south to Orion (M42, M43, M78), Taurus (home of the naked-eye Pleiades, M45, and the Crab Nebula, M1), Canis Major (home of Sirius, the brightest star in the night sky, and M41), Puppis (just to the left of Canis Major and home to M46, M47, M93), and Leo (far to your Southeast, home of M65, M66, and M96).

The North provides a plethora of objects as well, but the glow from Syracuse makes observing a bit more problematic. The Andromeda Galaxy and its Messier companions (M31, M32, M110) in Cassiopeia and the Dumbell Nebula (M76) and Triangulum Galaxy (M33) in Triangulum disappear quite quickly from view after 8:00 pm behind our high northwest tree line, so come early if you want to see them! Waiting out the tree line to our northeast (after about 9:30 pm), Ursa Major and Canes Venatici mark the locations of (from west to east) M82, M81, M108, M97, M109, M40, M106, M101, M51, M63, M94, and M3. As you can see, with limited fatigue on your neck in a pair of handheld binoculars, you can do a considerable amount of checking-off of the Messier objects in very short order and still go to sleep on schedule. I will have my trusty 6″ Newtonian “Stu-Special” in tow, and I’m sure several others will have scopes to complement the Observatory Cave if the weather holds out. Online lists and sky charts abound, but I assume any astronomy book you have will contain sky charts and Messier locations. Don’t forget a red flashlight.

For those who missed them the first time, you might have a chance to see the Andromeda galaxy and her companions again before 6:30 am. For the hardcore observers, you might even be able to cross them off your list twice, although the tree line to our northeast will likely make it quite difficult. We may have to move the party to higher ground!

For more info on the Marathon and Viewing Tips, see www.avastronomyclub.org/observing/messier/marathon_tips.htm and www.robhawley.net/mm/, or simply google “Messier Marathon.”

Space is the place,
Damian Allis, Ph.D.
sas@somewhereville.com

Links Used Above (Subject To Web Changes)

en.wikipedia.org/wiki/New_Moon
www.daguelaw.com
en.wikipedia.org/wiki/Gemini_(constellation)
en.wikipedia.org/wiki/C/2007_N3
seds.org/~spider/ngc/ngc.cgi?2420
en.wikipedia.org/wiki/Tully_(town),_New_York
seds.lpl.arizona.edu/messier/Xtra/marathon/marathon.html
en.wikipedia.org/wiki/Messier_marathon
en.wikipedia.org/wiki/Charles_Messier
en.wikipedia.org/wiki/Pierre_Mechain
en.wikipedia.org/wiki/Messier_object
en.wikipedia.org/wiki/Binoculars
en.wikipedia.org/wiki/Telescopes
en.wikipedia.org/wiki/Milky_Way
en.wikipedia.org/wiki/Constellation
en.wikipedia.org/wiki/Messier_110
en.wikipedia.org/wiki/Northern_hemisphere
en.wikipedia.org/wiki/Southern_Hemisphere
en.wikipedia.org/wiki/Moon
en.wikipedia.org/wiki/Messier_marathon#Criticism_of_Messier_Marathons
en.wikipedia.org/wiki/Zenith
www.syracuse.ny.us
www.skymaps.com/downloads.html
www.avastronomyclub.org/observing/messier/marathon_tips.htm
www.robhawley.net/mm