Astronomy News for the Month of October 2006


  This news letter is provided as a service by
The International Association for Astronomical Studies
located in Denver, Colorado. The astronomical data presented here is
not only useful in Colorado but in other parts of the world as well.

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For amateur radio and scanner enthusiasts, when in the Denver metro area, please join the Colorado Astronomy Net on the Rocky Mountain Radio League repeater on a frequency of 146.94 MHz on Tuesday nights at 7PM local time.


Special Notice to Denver, CO area residents and visitors to the area:

The Plains Conservation Center in Aurora hosts Star Parties the third Saturday of every month weather permitting. Visit http://www.plainsconservationcenter.org for more information and directions.


 Excerpts from JPL mission updates are provided as a public service as part
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For special JPL programs and presentations in your area visit the JPL Solar System Ambassador website.
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In this Newsletter...

Background screen credits:NGC5775 -Imaged March 21/22, 2001 using the 16" Kitt Peak Visitors Center telescope as part of the Advanced Observing Program.


10

The Moon

Phases

Apogee/Perigee

Moon/Planet Pairs

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The Planets & Dwarf Planet

Planetary Reports generated by "TheSky" software. These reports provide predicted data for the planets for the first of each month for the current year. The rise and set times for the Sun and the Moon for each day of the month are also included in the reports.

(All times are local unless other wise noted.)
Planetary Highlights for October - Mercury, Jupiter and Saturn are the highlights for this month. Mercury reaches it's highest elevation above the western horizon in the latter part of the month as Jupiter descends to meet it in the twilight glow after sunset. Saturn will provide excellent views through a small telescope this month and observers should be able to make out Cassini's division between the A and B rings on a good night.
Mercury - Is at greatest eastern elongation (25° above the western horizon) on the 16th. Mercury sets about 7:26 pm on the 1st and about 5:28 pm by month's end. Mercury shines at magnitude -0.3.
Venus - Is in superior conjunction on the 27th. Venus will return to the evening sky by the end of the year.
Earth - Most of the US returns to standard time on the 29th.
Mars - Is in conjunction with the Sun on the 23rd. Mars is also on the far side of the Sun as is Venus. Mars will return to the morning sky in several months.
Jupiter - Is very low in the southwest before sunset. Jupiter sets at 8:28 pm on the 1st and about 5:46 pm by month's end. Jupiter is in the constellation of Libra and shines at magnitude -1.7.
Saturn - Has returned to the morning sky rising around 3:01 am on the 1st and about 12:12 am by month's end. Saturn is in the constellation of Leo and shines at a magnitude of 0.6.
Uranus - Is still in an excellent position for evening viewing. Uranus rises about 5:35 pm on the 1st and about 2:31 pm by month's end. Uranus is in the constellation of Aquarius and shines at magnitude 5.8.
Neptune - Rises about 4:28 pm on the 1st and about 1:26 pm by month's end. Neptune is in the constellation of Capricornus this month. Neptune shines at a magnitude of 7.9.
Pluto (Now a Dwarf Planet) - Sets about 11:00 pm on the 1st and about 8:00 pm by month's end. Pluto is in the constellation of Ophiuchus. Pluto shines at magnitude 14.0. As always, good luck at spotting this one.

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Astronomical Events

Meteor Showers

  • The Draconids - This shower is associated with periodic comet Giacobini-Zinner. The duration may extend from October 6 to 10, though the point of maximum is very sharply defined within a 4-hour interval on October 9, but the annual maximum hourly rates are not consistent. The radiant rarely produces any recognizable shower except during years especially close to the parent comet's perihelion passage. The meteors are slow and tend to be relatively faint. They are generally yellow.

  • The Orionids - The duration of this meteor shower extends from October 15 to 29, with maximum occurring on [the morning of] October 21. The maximum hourly rate is usually about 20 and the meteors are described as fast.

    For more information about Comets and Meteor Showers, visit Gary Kronk's Comets & Meteor Showers webpage.

  • Comets

    Comet 4P/Faye is in the constellation of Aries shining at 9th magnitude will be difficult to spot from within a city. 4P/Faye is expected to brighten to about 8th magnitude in the next couple of months. A small telescope should be able to resolve this fuzzy ball. The best time to catch a glimpse of Faye is in the early morning hours around 4 am sometime after the 10th of the month.

    For information, orbital elements and ephemerides on observable comets, visit the Observable Comets page from the Harvard-Smithsonian Center for Astrophysics.

    For more information about Comets and Meteor Showers, visit Gary Kronk's Comets & Meteor Showers webpage.


    Eclipses

  • No eclipse activity this month.
  • Ocultations

    IOTA Logo

    More information on occultations can be found by clicking the IOTA logo.

    Asteroids

    (From west to east)

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    Planetary/Lunar Exploration Missions

    (Excerpts from recent JPL mission updates)
    Cassini - September 19, 2006 - Scientists Discover New Ring and Other Features at Saturn

    "Saturn sports a new ring in an image taken by NASA's Cassini spacecraft on Sunday, Sept. 17, during a one-of-a-kind observation.

    Other spectacular sights captured by Cassini's cameras include wispy fingers of icy material stretching out tens of thousands of kilometers from the active moon, Enceladus, and a cameo color appearance by planet Earth."

    Cassini Imaging Team

    For the latest mission status reports, visit Cassini Mission Status webpage. The speed and location of the spacecraft along its flight path can be viewed on the "Where is Cassini Now?" webpage.

    New Horizons - September 26, 2006 - Jupiter Ahoy!

    "Blazing along its path to Pluto, New Horizons has come within hailing distance of Jupiter. The first picture of the giant planet from the spacecraft's Long Range Reconnaissance Imager (LORRI) is a tantalizing promise of what's to come when New Horizons flies through the Jupiter system early next year."

    For more information on the New Horizons mission - the first mission to the ninth planet - visit the New Horizons homepage: http://pluto.jhuapl.edu/ for more information about the mission.

    Past, Present, Future and Proposed JPL Missions - http://www.jpl.nasa.gov/missions

    Visit JPL's mission pages for current status.

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       Mars Missions

    Mars Global Surveyor - No new news since August 11, 2006 - Mars Global Surveyor Celebrates Discovery of Deimos

    "Deimos was discovered 129 years ago on August 11, 1877. To celebrate, the MGS team presents the first and only Mars Orbiter Camera (MOC) image of this tiny moon."

    Mars Global Surveyor Images - September 21-27, 2006

    "The following new images taken by the Mars Orbiter Camera (MOC) on the Mars Global Surveyor spacecraft are now available:

    Every six months, a new suite of MGS MOC data are archived with the NASA Planetary Data System (PDS).

    Information about how to submit requests is online at the new Mars Orbiter Camera Target Request Site, at http://www.msss.com/plan/intro"

    Newly-released MOC images can be seen in the MOC Gallery, a website maintained by Malin Space Science Systems, the company that built and operates MOC for the Jet Propulsion Laboratory and NASA.

    Mars Global Surveyor completed its ninth year orbiting the red planet. MGS reached Mars on 12 September 1997. The first MOC images were obtained on 15 September 1997.

    Visit the MGS pages at http://mars.jpl.nasa.gov/mgs/index.html. There are over 200,000 images of Mars from the MGS, check out the newest MGS images of the surface of Mars.

    Mars Odyssey Orbiter - No new news since August 16, 2006 - NASA Findings Suggest Jets Bursting From Martian Ice Cap

    "Every spring brings violent eruptions to the south polar ice cap of Mars, according to researchers interpreting new observations by NASA's Mars Odyssey orbiter.

    Jets of carbon dioxide gas erupting from the ice cap as it warms in the spring carry dark sand and dust high aloft. The dark material falls back to the surface, creating dark patches on the ice cap which have long puzzled scientists. Deducing the eruptions of carbon dioxide gas from under the warming ice cap solves the riddle of the spots. It also reveals that this part of Mars is much more dynamically active than had been expected for any part of the planet."

    "A simulated fly-through using the newly assembled imagery is available online at http://www.nasa.gov/mission_pages/mars/missions/odyssey/20060313.html.

    The fly-through plus tools for wandering across and zooming into the large image are at http://themis.asu.edu."

    Mars Odyssey THEMIS Images
    Thermal Emission Imaging System (THEMIS) website: http://themis.asu.edu/

    September 25-29, 2006

    The following new images from the Mars Odyssey spacecraft are now available:

    The Odyssey data are available through a new online access system established by the Planetary Data System at: http://starbrite.jpl.nasa.gov/pds/"

    Visit the Mars Odyssey Mission page.

    Mars Exploration Rover Mission (Spirit and Opportunity) - September 29, 2006 -

    Spirit Status: Solar Power Is on the Rise as Spirit 'Follows the Water' - 970-976, September 29, 2006

    "Solar power levels on Spirit are slowly beginning to rise again following a winter low of 275 watt-hours on Martian day, or sol, 933 (Aug. 18, 2006). One hundred watt-hours is the amount of electricity needed to light one 100-watt bulb for one hour. This week, the rover's power levels rose to about 296 watt-hours.

    Spirit spent much of the week analyzing atmospheric dust attracted to magnets on the spacecraft. The rover identifies iron minerals in the dust using the Mšssbauer spectrometer. One of the two magnets, the filter magnet, is weaker than the capture magnet, allowing scientists to separate mineral grains that have the highest magnetic susceptibility, particularly minerals that contain iron."

    Opportunity Status: A View Worth Waiting For! - sol 947-953, September 29, 2006

    "Opportunity is healthy and sitting at the rim of "Victoria Crater"! After traveling 9,279.34 meters (5.77 miles) in 952 sols the team is rewarded by some of the most spectacular views seen on this mission. The week began with a checkout of basic mobility functions using the new flight software: arc, turn, go-to-waypoint and visual odometry. Also checked were a few of the mobility test criteria such as the time-of-day limits, suspension limits and a new capability for keep-out zones (areas deemed too dangerous to rove). Later in the week, Opportunity drove 60.1 meters (197 feet) over three sols to our current location at the top of 'Duck Bay.'"

    Landing sites

    Visit the Mars Exploration Rover page.

    Mars Reconnaissance Orbiter - September 29, 2006 - NASA's New Mars Camera Gives Dramatic View of Plane

    "Mars is ready for its close-up. The highest-resolution camera ever to orbit Mars is returning low-altitude images to Earth from NASA's Mars Reconnaissance Orbiter.

    Rocks and surface features as small as armchairs are revealed in the first image from NASA's Mars Reconnaissance Orbiter since the spacecraft maneuvered into its final, low-altitude orbital path. The imaging of the red planet at this resolution heralds a new era in Mars exploration."

    More information about the mission is available online at http://www.nasa.gov/mro.

    Mars Missions Status

    New Mars missions are being planned to include several new rover and sample collection missions. Check out the Mars Missions web page and the Mars Exploration page.

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    Links and Other Space News

    (If you have a link you would like to recommend to our readers, please feel free to submit it.)

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    Astronomical Lexicon

    Definitions of astronomical terms. Many of the astronomical terms used in this newsletter are defined here.

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    Acknowledgments and References

    Much of the information in this newsletter is from Astronomy® Magazine (Kalmbach Publishing), JPL mission status reports, the Internet, "Meteor Showers - A descriptive Catalog" by Gary W. Kronk, Sky & Telescope web pages (S&T), and other astronomical sources that I have stashed on my bookshelves.

    The author will accept any suggestions, constructive criticisms, and corrections. Please feel free to send me any new links or articles to share as well. I will try to accommodate any reasonable requests. Please feel free to send questions, comments, criticisms, or donations to the email address listed below. Enjoy! Return to Top


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    Keep looking UP!
    73 from KIØAR

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