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IAAS Monthly Astronomy Newsletter SUBSCRIBE Read important subscription notes below. Freelists.org |
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Background screen credits:NGC5775 -Imaged March 21/22, 2001 using the 16" Kitt Peak Visitors Center telescope as part of the Advanced Observing Program.
| Planetary Highlights for June - Mercury is at its best for the year due to 2 positional factors. Mercury reaches greatest elongation (25 deg. on the 20th) and farthest point north of the ecliptic (7 deg. on the 1st). These factors place Mercury relatively high in the evening skies for the entire month. On the evening of the 15th, Mars joins Saturn in the vicinity of the Beehive cluster (M44) in the constellation of Cancer the Crab. | |
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Mercury - Is at greatest eastern elongation (25 deg.) on the 20th. Look for Mercury about 45 minutes after the Sun sets. Mercury sets about 9:44 pm on the 1st and about 9:37 pm on the 30th. Mercury shines at magnitude -1.0. |
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Venus - Is still visible in the morning sky before sunrise. Venus rises about 3:49 am on the 1st and about 3:36 am by month's end. Venus passes through the constellation of Aries and into Taurus this month and shines at magnitude -3.8. |
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Earth - Summer solstice occurs at 8:26 am EDT on the 21st. |
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Mars - Is at aphelion (154.9 million miles from the Sun) on the 25th. Sets about 11:44 am on the 1st and about 10:41 pm by month's end. Mars is in the constellation of Cancer this month. Mars shines at magnitude 1.7. |
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Jupiter - Still remains visible for almost the entire evening and is still near its best for the year. Jupiter rises at 5:37 pm on the 1st and about 3:31 pm by month's end. Jupiter is in the constellation of Libra and shines at magnitude -2.4. |
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Saturn - Sets around 12:07 am on the 1st and about 10:19 pm by month's end. Look for Saturn in the early evening hours towards the west. Due to its descent into the twilight haze, Saturn may not be as bright or as detailed as it has been over the past year. Saturn is in the constellation of Cancer. Saturn shines at a magnitude of 0.4. |
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Uranus - Rises about 1:45 am on the 1st and about 11:43 pm by month's end. Uranus is in the constellation of Aquarius and shines at magnitude 5.8. |
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Neptune - Rises about 12:35 am on the 1st and about 10:36 pm by month's end. Neptune is in the constellation of Capricornus this month. Neptune shines at a magnitude of 7.9. |
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Pluto - Is at opposition on the 16th rising about the same time the Sun sets. Pluto rises about 8:51 pm on the 1st and about 6:50 pm by month's end. Pluto is in the constellation of Ophiuchus. Pluto lies just 2.8 billion miles from Earth, its closest approach for the year. Pluto shines at magnitude 13.9. As always, good luck at spotting this one. |
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Meteor Showers
The Arietids Meteor Shower - This is the strongest daylight meteor shower of the year. The duration extends from May 22 to July 2, with maximum activity occurring on June 8. The hourly rate is near 60 at maximum. The June Lyrids - This shower is active during June 10 to 21, producing predominantly blue and white meteors at a maximum hourly rate of 8 per hour on June 15. The average magnitude of this shower is near 3, while 32% of the meteors leave trains. The Zeta Perseids - This daylight shower occurs during May 20 to July 5. Maximum occurs on June 13. Radar surveys have revealed the activity of this shower to be near 40 per hour. For more information about Comets and Meteor Showers, visit Gary Kronk's Comets & Meteor Showers webpage. |
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Comets
Comet Comet C/2004 B1 (LINEAR) passes through the southeast corner of the constellation of Hercules this month (as viewed from the Northern Hemisphere). However, this comet never brightens past 11th magnitude, so you'll need to find a nice dark area for viewing this one. Comet 73P/Schwassmann-Wachmann 3 is now in a position to be spotted best from the Southern Hemisphere as it approaches perihelion in early June. Will its myriad pieces survive the trip around the Sun to return in 5 years? As it has broken into over 60 chunks of cometary debris. Comet 73P is in the constellation of Cetus this 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. |
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Eclipses
No eclipse activity this month. |
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Ocultations
More information on occultations can be found by clicking the IOTA logo. |
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Asteroids
(From west to east)
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Cassini - April 30, 2006 - Cassini to Fly by Smog-Cloaked Titan
"Cassini's powerful radar, which can see through Titan's many haze layers, will image across an optically-bright, continent-size region of Titan known as Xanadu on April 30, 2006. It is unclear whether Xanadu is a mountain range, giant basin, smooth plain, or a combination of all three." 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. |
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New Horizons - April 28, 2006 - New Horizons in Space: The First 100 Days
"April 29 marks another milestone in New HorizonsŐ historic journey to Pluto - the spacecraft's 100th day of flight. "It's been a good flight so far, and we're working to keep it that way," says New Horizons Mission Operations Manager Alice Bowman, of the Johns Hopkins Applied Physics Laboratory in Laurel, Md." 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. |
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Past, Present, Future and Proposed JPL Missions - http://www.jpl.nasa.gov/missions Visit JPL's mission pages for current status. |
Mars Missions
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Mars Global Surveyor - No new news since January 03, 2006 - MGS locates Spirit
"Shortly before Spirit's Martian anniversary, the Mars Orbiter Camera acquired an image centered on the rover's location at that time in the "Columbia Hills." Mars Global Surveyor Images - June 22-28, 2006 "The following new images taken by the Mars Orbiter Camera (MOC) on the Mars Global Surveyor spacecraft are now available:
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 MOCGallery, 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 eighth 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. |
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Mars Odyssey Orbiter - No new news since April 07, 2006 - 2001 Mars Odyssey Turns 5 - 4/7/06
"NASA's 2001 Mars Odyssey celebrates five years of exploration, returning spectacular images of features rarely seen on Earth and paving the way for future missions." "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 June 26-30, 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. |
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Mars Exploration Rover Mission (Spirit and Opportunity) - June 30, 2006 -
Spirit Status: Spirit "Warms up the Engines," Continues Work on Mars - sol 874-880, June 23, 2006 "Since the beginning of Spirit's winter science campaign, the science and engineering teams have held joint meetings every few weeks to track campaign progress and come up with a strategic plan that balances engineering resources with science productivity. This week, Spirit began acquiring the 22nd column of the 27-column "McMurdo panorama" and completed the seventh of nine photon transfer calibrations - procedures designed to measure electronic noise (unwanted signals) picked up by imaging sensors that convert light into electrical current in the rover's cameras." Opportunity Status: Full Plate for Opportunity - sol 859-866, June 30, 2006 "Opportunity is healthy and making good progress towards "Victoria Crater," with just under 1,400 meters (.86 mile) to go. The team spent several days this week setting up for some robotic arm work over the weekend, provided there is a good piece of outcrop in the work volume. Opportunity will continue driving next week." Visit the Mars Exploration Rover page. |
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Mars Reconnaissance Orbiter - June 19, 2006 - Pace Quickens for NASA Spacecraft Orbiting Mars
"NASA's newest spacecraft at Mars has already cut the size and duration of each orbit by more than half, just 11 weeks into a 23-week process of shrinking its orbit. By other indicators, the lion's share of the job lies ahead. "The orbits are getting shorter and shorter. We've finished about 80 of them so far, but we have about 400 more to go, and the pace really quickens toward the end," said Dan Johnston, Mars Reconnaissance Orbiter deputy mission manager at NASA's Jet Propulsion Laboratory, Pasadena, Calif." More information about the mission is available online at http://www.nasa.gov/mro. |
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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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