The European Space Agency's Venus Express spacecraft was successfully placed into a trajectory that will take it on its journey from Earth towards its destination...the planet Venus, Upon reaching our sister planet next April... Venus Express will perform a detailed study of the structure, chemistry and dynamics of the planet's atmosphere... which is characterized by extremely high temperatures, very high atmospheric pressure, a huge 'greenhouse effect' and as-yet inexplicable 'super-rotation' which means that it's winds speed around the planet in just four days.
Continuing right here in our solar system... if you're bummed about not seeing the planet Mars yet... and feel you've completely missed out... don't worry... you haven't. Mars is still very near its biggest and brightest... and... as an added bonus.... its also rising just before sunset. This leaves it well placed for observing very shortly after dark.. and throughout the better part of the evening. Those of you with access to a telescope can still get some incredible martian treats. Details on the surface of the red planet are easy to resolve in even the most modest of instruments.
Speaking of treats... this weekend we point our telescopes towards the constellation Andromeda the princess. Andromeda can be found just to the northeast of the Great Square of Pegasus. In fact, the northeastern most star of the great square doubles as the southwestern most star in Andromeda. Andromeda is home to a host of deep sky treasure. Tops on anybody's observing list would undoubtedly be M31, The Andromeda Galaxy. The Andromeda Galaxy is simply the biggest and baddest galaxy visible in northern skies. The list of superlatives for Andromeda is quite extensive. Andromeda is closest major galaxy to our own. It is also the largest of the local galaxies... roughly 1/3 larger than our own Milky Way Galaxy. Finally, Andromeda is the most distant object that can be seen with the naked eye. That's right. If you know where to look... and are under fairly dark skies... you can see the Andromeda Galaxy without the aid of a telescope or binoculars! Of course, if you have some sort of optical aid, the views can be tremendous. In a large telescope, Andromeda clearly shows a couple of dustlanes that separates the core of the galaxy from its spiral arms. In some telescopes, you can even see a couple of its brighter star clusters.
Too, this coming Monday night... a nearly full Moon will cross the sky with none other than the planet Mars. The event is known as a conjunction... or an alignment. It should be quite a sight... pairing the two brightest objects in the night sky... side by side. M45, The Pleiades Star Cluster will be waiting in the wings... to the lower left.
Finally, Utah Skies will be attending the 2nd Annual Green Building Seminar and Trade Show in Park City on November the 18th where Marc Richmond, Vice President of What’s Working, will give a seminar on the latest in green building practices, technologies, and materials. The trade show provides additional educational opportunity by giving attendees a chance to meet providers of green building materials and services, including night-sky and eco-friendly lighting on display along with information on how you can light more responsibly.
Astronomy News From Around The World...
and Beyond
Friday, November 11th, 2005
Three's Company
Papa Moon, Mama Moon, and Baby Moon. Images from the heavens are sometimes fantastic, and this is no different. Here, three of Saturn's moons -- Dione, Tethys and Pandora -- near the rings offer a clear example of the diverse nature of the 6th planet's moons as imaged by the orbiting spacecraft Cassini. Tethys (in the middle, here) is on the far side of the rings in this view; while Dione (on the left) and little Pandora are much nearer to the spacecraft. But which one is "just right"?
Thursday, November 10th, 2005
Backyard Spectroscopy Seminar
The Remote Astronomical Society (RAS) has announced a web-based seminar on backyard spectroscopy for the amateur astronomer, presented by Dale Mais, Ph. D of the Society for Astronomical Science. Free of charge to the general public, this seminar is intended to highlight the science amateur astronomers can perform in their own backyards. Sign up soon, as there is limited space for this noon MST November 13th webinar. Check out the RAS press release for more details.
Wednesday, November 9th, 2005
Spitzer Sees The Light
The orbiting Spitzer Space Telescope recently snapped this exquisite image dubbed "The Mountains of Creation". Checkout all the details from the Spitzer News Room.
Ring-F For Dione
In this stunning Cassini image captured on September 20, 2005, Saturn's moon Dione can be seen next to the delicate wisps of the outer-most F-ring. Cassini was about 1.2 million miles from Dione when this infrared, green, and ultraviolet color composite image was taken. Check out the Cassiniimage page at NASA's JPL for more info.
Venus Express On Its Way
The European spacecraft Venus Express has been successfully placed into a trajectory that will take it on its journey from Earth towards its destination of the planet Venus, which it will reach next April. Venus Express will perform a detailed study of the structure, chemistry and dynamics of the planet's atmosphere, which is characterized by extremely high temperatures, very high atmospheric pressure, a huge 'greenhouse effect' and as-yet inexplicable 'super-rotation' which means that it's winds speed around the planet in just four days. See the ESA press release for more info.
Tuesday, November 8th, 2005
Wow! Now That's A Big Mirror!
The casting of the Giant Magellan Telescope's first of seven 8.4 meter (27.5-foot) primary mirror segments is complete. The GMT's primary mirror will be comprised of a total of seven segments, providing the resolving power of a 24.5-meter (80-foot) primary mirror - larger than any telescope ever built. Check out the GMT website for more info and a bigger picture of that enormous mirror segment!
Whose Quartet?
Astronomers using the European Southern Observatory's Very Large Telescope captured this beautiful and interesting image of Robert's Quartet as study of compact galaxy groups, excellent laboratories for the study of galaxy interactions and their effects, in particular on the formation of stars. The quartet has a total visual magnitude of almost 13, or about 600 times fainter than the faintest object that can be seen with the unaided eye. On the sky, the four galaxies are all within a circle of radius of 1.6 arcmin, corresponding to about 75,000 light-years. Check out the ESO press release for more info and images.
Monday, November 7th, 2005
Seven Sisters Are A Sight To See
One of the more familiar and picturesque clusters in the autumn and winter night sky is the Pleiades, number 45 on Messier's list of object that weren't comets. Rising as the sun sets, The Seven Sisters vie for your attention with bright Marsnearby in the eastern sky. M45 doesn't transit until 1am MST, when it'll be at its highest point in the sky. This object is wonderful to the naked eyes and stunning through binoculars; given its size, only those telescopes that provide a wide field-of-view can do the cluster justice.
China recently announced plans to put a man on the moon around 2017. Once their, they plan to setup a moon based telescope... and check out the quantities of helium-3... and nearly perfect, non-polluting energy source that could provide enough energy to power the Earth for thousands of years. In September, The United States announced it's own plans to return to the moon by 2018. Checkout CNN.com/SPACE for more details.
Our star is again devoid of any
signs of sunspots. This (finally) is in line with the approach of solar
minimum... expected sometime in 2006.
The sun is a fascinating subject. It's
appearance changes from day to day. In fact, it is the only star in the
sky that we can see any details on at all!
Mercury remains visible in the western sky, low on the horizon after sunset. Having reached its greatest eastern elongation on the 20th of June, it is falling back into the sun's glare and it's inferior conjunction on July 18th.
Because of its proximity to the Sun, Mercury is never really viewed against a dark background. Rather, it always struggles to be seen over the light of the setting or rising Sun. Patience (and clear skies) will reward you with some beautiful evening views of this planet.
In the accompanying image, Mercury is seen following the sun toward the western horizon of southern Utah with a slender crescent moon close behind.
Still in the morning sky near sunrise, Venus marks a beginning of the "early-bird's" day. Having attained its greatest western elongation earlier in the year, Venus is continuing its inexorable journey appearing to fall into the sun towards its superior conjunction at the end of October.
If you have a telescope handy, take a peek at the love goddess' name sake; the crescent of Venus is lovely indeed. Venus was beautiful along side the Pleiades on the June 23rd , and look forward to the first of July when Venus rises with Aldebaran, the 14th of July when Venus and the Crab Nebula dance together, and the 26th and 27th of August when Venus and Saturn rise together less than a degree apart!
The ESA's Venus Express spacecraft is now in its mission phase. The ESA reports "On 3 June at 13:42 UT, after 207 days of flight, 43 orbits around Venus and many test activities, Venus Express has formally completed its commissioning phase and has entered the routine science phase...The nominal mission is scheduled to last till the end of October 2007." Venus Express will study the planet in great detail, in particular the Venusian atmosphere and clouds.
While we train our optics skyward nightly, there are visual treasures and marvels to behold earthward. Pictured here is a collection of richly colored rock in the Uinta Mountains, a massive range in Northern Utah carved by glaciers from an immense uplift of Precambrian rock. Some of this rock is exposed as colorful quartzite and shales. The main crest of the Uinta Mountains runs west to east for more than 60 miles, rising over 6,000 feet above the Wyoming and Uinta Basins to the north and south. The highest point in Utah is Kings Peak at 13,528 feet.
The Moon will be new on the 25th, and begin waxing crescent until first quarter on July 3rd, when it will wax gibbous approaching full on July 11th. Those observers that consider the moon "light pollution" look forward to this time of the synodic cycle as the moon travels with the sun, keeping the night sky dark, favoring views of distant, elusive, and faint fuzzies - galaxies, nebulae, and clusters.
Remember, as the moon waxes and wanes, you can look forward to those phases where Moon observations are most fascinating. Features appear - mountains, craters, rilles - as the sunlight casts long, defining shadows. Look along the portion of the Moon separating light from dark, known as the terminator, for the greatest contrasts.
The Red Planet is found high in the western sky at sunset as it moves to it's superior conjunction opposite the Sun later in the year. Look at this sweet shot taken by Utah Skies member Brian Jolley last year when Mars was at its closest. He took this through the historic Clark refractor at Lowell Observatory.
Even without a telescope the view of and around Mars is interesting. Having moved through the constellation Gemini, Mars is approaching a conjunction with Saturn around June 17th. On its way, it will pass through M44!
Planet Jupiter | Solar System | The Utah Skies Report
Jupiter is currently rising late in the afternoon, placing it favorably for those wanting views of the Sun's largest planet before heading off to bed.
This image is an example of what Jupiter has to offer viewers: interesting detail in the equatorial bands and, if conditions are right, swirls and festoons. Much beautiful structure can be seen through a typical telescope, but results vary depending on telescope aperture and sky conditions. Too, the Great Red Spot has some company: another storm has grow in proportion near the GRS, and has come to be known as Spot Jr!
If you have binoculars, point these towards Jupiter. While you won't be able to see any details on the planets surface, binoculars will clearly show you several of Jupiter's brightest moons, and regular observations will show them jockey for position as they orbit the giant planet. The movement is quite apparent, sometimes even in the span of a few hours.
This sweet shot of Jupiter nicely shows its great red spot and some of the incredible details just waiting your observation. Additionally, you can see one of Jupiter's moons eclipsing the giant planet. The round "ink spot" on the planet's surface is the shadow cast by its moon. Watching Jupiter's moons as they orbit and occasionally transit the giant planet is a very interesting part of observing Jupiter.
Saturn is now rising mid-morning and reaching the highest point in its path across the sky in the late afternoon; the spectacular views of the ringed planet will soon come to an end as it moves behind the sun with the passing weeks. Some truely great views of the ringed planet and its satellites are available on the Cassini Huygens pages. This sweet shot was taken by Don Brown of Utah Skies.
Uranus is currently rising in the early morning, about an hour after Neptune.. The Earth and Uranus have ostensibly achieved their greatest separation, and will soon begin to draw nearer again.
This fascinating image was taken from a ground-based telescope in the European Southern Observatory.
Planet Neptune | Solar System | The Utah Skies Report
The planet Neptune, is currently rising several hours before the sun, leaving you precious little time to view the 8th rock. To speed up your acquisition of the planet, look just east of south before first light. Find Deneb Ageldi; Neptune is just about 4.5° west and north of "the water goat's tail". At just a touch brighter than mag 8, Neptune should be visible as a faint star-like object in binoculars or as a bluish object in a telescope. Once you've found it, higher powers will clearly reveal the disk of the planet .
This beautiful image of Neptune and its moon, Triton, was taken by the Voyager 2 spacecraft from a perspective that will never be had from Earth. Interesting to note is the gray hue of the planet in this image. The atmosphere of the planet preferentially scatters the light forward from this vantage and so removes the bluish tinge, and reddens the color.
Planet Pluto | Solar System | The Utah Skies Report
Pluto is rising before midnight, giving you the time you'll need to seek this faintest of planets. To know you've seen Pluto is going to require observations over several nights, carefully noting star patterns until you see one point of light move relative to the others: that's Pluto!!! But don't try this at home kids, unless you have some serious aperture, because at mag 15+, you're gonna need it!
This image of Pluto and its moon Charon was taken by the Hubble Space Telescope, showing the improved performance of a space-based observational platform over ground-based telescopes.
The
Hubble Space Telescope has distinguished itself as a premier
source of astronomical images. Amazing HST images have
graced the covers of major magazines and newspapers worldwide. In
recognition of the amazing advances in astronomy and
physics which have come from Hubble discoveries, we'd like to
devote a section of this report to some of these incredible images, and
share some of them with you. Our latest comes directly from the Hubble Heritage Team.
A Bird's Eye View of
a Galaxy Collision
What appears as a bird's head, leaning over to snatch up a
tasty meal, is a striking example of a galaxy collision in
NGC 6745. A large spiral galaxy, with its nucleus still
intact, peers at the smaller passing galaxy (nearly out of
the field of view at lower right), while a bright blue beak
and bright whitish-blue top feathers show the distinct path
taken during the smaller galaxy's journey. These galaxies
did not merely interact gravitationally as they passed one
another, they actually collided.
When galaxies collide, the stars that normally comprise
the major portion of the luminous mass of each of the two
galaxies will almost never collide with each other, but will
pass rather freely between each other with little damage.
This occurs because the physical size of individual stars is
tiny compared to their typical separations, making the
chance of physical encounter relatively small. In our own
Milky Way galaxy, the space between our Sun and our nearest
stellar neighbor, Proxima Centauri (part of the Alpha
Centauri triple system), is a vast 4.3 light-years.
However, the situation is quite different for the
interstellar media in the above two galaxies - material
consisting largely of clouds of atomic and molecular gases
and of tiny particles of matter and dust, strongly coupled
to the gas. Wherever the interstellar clouds of the two
galaxies collide, they do not freely move past each other
without interruption but, rather, suffer a damaging
collision. High relative velocities cause ram pressures at
the surface of contact between the interacting interstellar
clouds. This pressure, in turn, produces material densities
sufficiently extreme as to trigger star formation through
gravitational collapse. The hot blue stars in this image are
evidence of this star formation.
This image was created by the Hubble Heritage Team using
NASA Hubble Space Telescope archive data taken with the Wide
Field Planetary Camera 2 in March 1996. Members of the
science team, which include Roger Lynds (KPNO/NOAO) and Earl
J. O'Neil, Jr. (Steward Obs.), used infrared, red, visual
and ultravoilet filters to image this galaxy system. Lynds
and O'Neil are currently using the Hubble data along with
ground-based radio observations to further study the
interactions within NGC 6745.
Our Constellation report is an easy way for people to become familiar with the nighttime sky. We'll discuss myths associated with the various constellations as well as describing the numerous deep sky objects residing in the area. No equipment is required to view the constellations, though a star chart can be quite helpful. This ease of observing makes constellations a natural place to begin your journey to the stars.
This weekend we move on to the constellation Andromeda.
Andromeda was the daughter of King Cepheus and Queen Cassiopeia of Ethiopia. When Cassiopeia boasted that Andromeda's beauty exceeded that of the sea nymphs, the nymphs prevailed upon Neptune, the god of the sea, to punish Cassiopeia. Neptune sent the sea monster Cetus (sometimes known more favorably as simply a whale) to ravage the kingdom of Cepheus. When Cepheus consulted an oracle for advice, he was informed that only the sacrifice of Andromeda to Cetus the Sea Monster would appease the gods. Thus chained to a rocky cliff, she was rescued by Perseus, who turned Cetus into stone by flashing the face of Medusa before the monster's eyes. Perseus was carried there just in time by the winged horse Pegasus.
Ok, let's start things off the biggest and baddest galaxy visible in northern skies, M31 The Andromeda Galaxy(mag3.47). There are so many superlatives which are fitting for Andromeda: Andromeda lies some 2.3 million light years distant, making it the nearest major galaxy to our own. It is also the most distant object visible to the naked eye. The two small fuzzy objects also visible in this image are actually galaxies. They are M32 and M110. We'll get to these galaxies shortly. Astronomers estimate the mass of Andromeda at over 300 billion suns. This is almost twice as massive as our own Milky Way galaxy. Additionally, it spans over 130,000 light years or roughly 3° -- nearly 6 times the diameter of the full moon! Andromeda is visible in virtually any telescope or binoculars. In larger telescopes, it displays one or more prominent dust lanes. It is a site to behold in the ObDob. The bright patch on the left side of the image is actually NGC206 -- a bright star cloud in Andromeda itself. We always spend time on Andromeda at Utah Skies Star Parties.
This shot of Andromeda was taken by Don Brown from Park City.
Next up is a neighbor of Andromeda M32(mag8.2). M32 is what is known as a dwarf elliptical galaxy. M32 requires a substantial amount of magnification to reveal any detail. At low powers it is simply a soft fuzzy circular patch that almost appears to be an appendage to M31.
Still in the same low power field of view, we have Elliptical Galaxy M110(mag8.0). Throw some magnification at this object and you'll be rewarded with some fine details. It has a mottled core which is caused by an irregular clumping of stars. Were this object anywhere else in the sky it would get much more attention. Located, as it is, in the same field of view as the giant Andromeda galaxy causes it to be virtually overlooked.
Curiously, this galaxy was discovered by Charles Messier on August 10, 1773, and depicted on his fine drawing of the "Great Andromeda Nebula" and its companions published in 1807, but Messier did never himself include this object in his catalog, due to unknown reasons, perhaps a certain sloppiness in recording. It was the last additional object, added finally by Kenneth Glyn Jones in 1966. Independent of Messier's discovery, Caroline Herschel discovered M110 on August 27, 1783, little more than 10 years after Messier, and William Herschel numbered it H V.18 when he cataloged it on October 5, 1784.
M110 is about the same distance as the Andromeda galaxy M31, roughly 2.9 million light years. It's mass is estimated to be between 3.6 and 15 billion solar masses.
Don Brown captured this image in November of 2004.
Next up is NGC7662(mag8.6), The Blue Snowball Nebula. This interesting little planetary nebula is reported to be visible in a good pair of binoculars. In an 8" telescope, it appears as a circular blue patch. In larger apertures, it begins to turn an aquamarine shade. This is an object that definitely handles increased magnification well. The more power you throw at it, the more detail it reveals.
Who says (observational) astronomy is black and white?
Next, check out Open Star Cluster NGC752(mag5.7). This beautiful open cluster spans almost a full degree in diameter. It appears as a loose grouping of over 60 stars in telescopes in the 6-8" range. Located only 1200 light years away, this very old cluster is almost 2 billion years old.
Our final stop in Andromeda leads us to this weeks Utah Skies Challenge Object, Edge-on Galaxy NGC891(mag10). This is one of the finest examples of an edge-on galaxy. It is a small cigar-shaped galaxy with a beautiful dust lane running through its center.
Located about 3.5* east of Gamma Andromeda, this beauty is clearly visible in an 8" telescope. With increased magnification and averted vision, you can begin to make out the dust lane. In larger instruments under dark skies, the views are amazing. Current estimates place its distance at around 31 million light years.
If you are able to find
all of these objects, you may be one of the
few, the proud, the Deep Sky Obsessed.
E-mail your findings to DeepSkyObservations@UtahSkies.org.
Ecological Consequences of Artificial Night Lighting
Big news: A groundbreaking book on the impact of artificial night
lighting. It's entitled, "Ecological
Consequences of Artificial Night Lighting"... and is due to be released
sometime in November. Published by
Island
Press, this book is sure to shed some light (pun intended) on the very
important, if somewhat mis-understood, topic of
light pollution.
While certain ecological problems associated with artificial night lighting are
widely known-for instance, the disorientation of
sea turtle hatchlings by beachfront lighting-the vast range of influences on
all types of animals and plants is only beginning to be recognized. From nest
choice and breeding success of birds to behavioral and physiological changes in
salamanders, many organisms are seriously affected by human alterations in
natural patterns of light and dark.
Ecological Consequences of Artificial Night Lighting is the first book to
consider the environmental effects of the intentional illumination of the night.
It brings together leading scientists from around the world to review the state
of knowledge on the subject and to describe specific effects that have been
observed across a full range of taxonomic groups, including mammals, birds,
reptiles and amphibians, fishes, invertebrates, and plants.
Ecological Consequences of Artificial Night Lighting provides a scientific basis
to begin addressing the challenge of conserving the nighttime environment. It
cogently demonstrates the vital importance of this until-now neglected topic and
is an essential new work for conservation planners, researchers, and anyone
concerned with human impacts on the natural world.
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