Astronomy in 2009
Axarquia, Costa del Sol, Andalucia, Spain

NIGHT SKIES

IYA2009 - 2009 IS THE INTERNATIONAL YEAR OF ASTRONOMY
Commemorating glorious events particularly the 400th anniversary of Galileo’s invention of the telescope
Slogan - The Universe, Yours to Discover
Events during October
· In Spain and the UK, clocks are moved backwards one hour at 2am on the 25th October.

· The Moon: Full - 4th, New - 18th.

Anniversaries during October
· Fifty years ago, in October 1959, the Russian spacecraft Lunik 3 flew round the Moon and sent back the first pictures from behind the Moon.

Mercury
Astronomy, Mythology & Astrology of Mercury Click for more information
Mercury is visible to observors in northern and tropical latitudes as a morning object during the first half of October. For observors in the higher northern temperate latitudes this is the best morning apparition of 2009.

Mercury is at greatest western elongation (18š) on 6th October.

The best times to observe Mercury in the northen hemisphere are when it is an evening star in the spring and a morning star in the autumn. In midsummer the lighter skies make visibility difficult near the horizon.

Venus
Astronomy, Mythology & Astrology of Venus Click for more information
Venus, remains at a magnificent magnitude -3.9, visible as a brilliant object in the eastern morning sky. Venus passes 0.5š south of Saturn in the pre-dawn sky on 13th October although Saturn will be very faint in comparison to Venus.

Transit On the 8th June 2004, Venus was at inferior conjunction and transited the sun. Transits of Venus are rare, taking place at greater than 100 year intervals and usually in pairs. The last two transits of Venus were in 1874 and 1882. June's transit began at 7.20h and lasted 6 hours until 13.20h, the total event visible from Europe as a small black disc crossing the lower part of the Sun from left to right. The next transit will be in late June 2012. After that, transits of Venus won't occur again until 2117 and 2125.

Before and after inferior conjuction, when Venus is the closest it comes to the Earth, are the times at which the planet is most brilliant and can be seen setting or rising 4 hours after or before the Sun. The dates of the next two inferior conjunctions are October 28th 2010 and October 26th 2018.
Mars
Astronomy, Mythology & Astrology of Mars Click for more information
Mars is still a morning object, visible in the eastern sky before midnight onwards with a magnitude brightening from +0.8 to +0.5 during October. The planet moves into Cancer early in October.

At opposition on the 28th August 2003, Mars was only 56 million kilometres from the Earth. It showed a disc of 25.1 seconds of arc across which is almost as large as it can ever appear. Mars started 2003 at 310 million kilometres from the earth at 4.5 seconds of arc and 1.6 magnitude. By opposition it brightened 50 times to reach -2.9 magnitude but faded to 0 magnitude by December. Even to the naked eye Mars was a striking object in the summer and autumn sky, easily identifiable by its reddish hue in an area of sky poor in bright stars. Mars will not be as close again until 2018.

These favourable oppositions occur every 15 or 17 years but other oppositions occur at average intervals of 2 years 2 months during which time the planet makes a complete circle of the Earth. In general Mars is observable every other year, being too close to the sun for favourable conditions during other times. Brightness at opposition varies from -1.0 to -2.9 magnitude, and when furthest from the earth it fades to 1.7 magnitude. The planet can be identified by its orange-red colour.

As in 2003, Mars comes nearest to the Earth at oppositions at the end of August. At these times it can be brighter than Jupiter, although low in the sky in Aquarius for northern observors. In the northern hemisphere, the planet may be better seen at oppostions during autumn and winter months when it is higher in the sky.

Jupiter
Astronomy, Mythology & Astrology of Jupiter Click for more information
At -2.6 magnitude, Jupiter continues to be a conspicuous object in the western evening sky. Jupiter reaches its second stationary point on October 13th after which the planet resumes an easterly motion.

Varying from 603 (at its closest) to 770 million kilometres from the sun, the difference in brightness between opposition and conjunction varies less than with Mars, from about -2.9 to -1.8 magnitude. Always a bright planet, Jupiter comes to opposition a month later each year, moving approximately from one zodiacal constellation to the next.

The 4 largest moons of Jupiter are easily visible through a small telescope, ranging from 4.6 to 5.6 in magnitude. The innermost, Io, takes 1.8 days to orbit the planet making its motion easily detectable within a few minutes.

Saturn
Astronomy, Mythology & Astrology of Saturn Click for more information
Saturn remains in Virgo at +1.1 magnitude. Slowly emerging from morning twilight, Saturn becomes visible in northern and equatorial latitudes a week into October and further south after another week.

On 8th October, Mercury, at -0.7 magnitude, passes 0.3š south of Saturn. Five days later, Venus, at -3.9 magnitude, passes 0.5š to the south.

On 10th August 2009 the Sun passed through Saturnīs ring plane from south to north. As Earth remains south of this plane until September, the Sun and the Earth are on opposite sides of the ring plane during this time making the rings invisible from Earth.

Saturnīs rings continue to close with the south pole presented towards Earth and the far side of the rings no longer appearing clear of the planetīs body. This year the Earth will pass through the ring plane making the rings invisible for a short while. This will be the first time since 1997 that the planetīs magnitude has faded to this level.

Saturn moves more slowly than Jupiter and can remain in the same constellation for several years. The brightness of the planet depends on the aspect of its rings, as well as its distance from Earth and the Sun.

The planet crossed the equator into the northern hemisphere in 1996 where it will remain until 2010 with the southern side of the ring system facing the earth. Because of its distance, its brightness varies little between opposition and conjunction but is affected by the huge ring system. Seen edge on the rings contribute little or no light.

Every 15 years the plane of Saturn's rings passes through the sun, illuminating first the north and then the south side. For a few days the rings are edge on to the sun. About the same time the Earth passes through the ring plane and, depending on the Earth's position, this may happen just once or 3 times. During 1995/96 there was a triple crossing and the next will be 2038/39. The next single crossings will be in 2009 and 2025.

Saturn's largest moon, Titan, is visible in small telescopes orbiting outside of the ring system.

Uranus
Astronomy, Mythology & Astrology of Uranus Click for more information
Brightness varies slightly, reaching a maximum of +5.6 magnitude at opposition. This is bright enough to see with the naked eye but identifying it against the stars is difficult. At closest approach, Uranus is 2,856 million kilometres (1,775 million miles) from Earth.
Neptune
Astronomy, Mythology & Astrology of Neptune Click for more information
Neptune has an average magnitude of 7.9 which varies little with changing distance. At its closest, Neptune is 4,341 million kilometres (2,697 million miles) from Earth.
Pluto
Astronomy, Mythology & Astrology of Pluto Click for more information
No longer an offical planet and never brighter than +13 magnitude, Pluto is only visible through powerful telescopes.
Moon
Astronomy, Mythology & Astrology of the Moon Click for more information
October
Full moon: 4th
Last quarter: 11th
New moon: 18th
First quarter: 26th
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