Wandering through the realms of the cosmos, pondering its huge vastness

Posts tagged “venus greatest elongation

Final Appearance of Venus in the Western Sky for 2010


In this image taken last October 3, the planet Venus was just 13.5 degrees above the western horizon at 6:18 PM (UTC+8), Apparent Magnitude: -4.44 A few days later, Venus was lost in the glare of the sun and set soon after it.

Shining high in the evening sky over the past few months, Venus is the brightest thing in the sky after the Sun and Moon. All this has changed rapidly. To those who have been watching Venus night after night, you have probably noticed that it is not as high in the sky as it was like a month before. Venus has gone lower and lower in the sky during the past few weeks and now it was no longer visible as it was too close to the Sun. On October 29, it will be in inferior conjunction, the time when Venus passes between the Sun and the Earth. During this period, Venus cannot be seen from Earth. It will disappear for a short period that averages 8 days until it becomes visible again in the morning sky, rising with the Sun (called heliacal rising).

After rising, Venus will reach its greatest brilliancy then its greatest western elongation, moving quickly (in retrograde motion) away from the Sun.

Venus at 19 degrees above the western horizon, Sept. 19, 2010 at 6:26 PM (UTC+8) Apparent magnitude: -4.44

Planetary Events — August 20, 2010

For Philippine sky gazers, the planets Venus and Neptune will make their greatest appearance for this year on the evening of August 20 😀

The brightest planet in the solar system, Venus  will appear especially prominent because it will climb to its highest point in the evening sky upon reaching its greatest elongation. It will lie 47° from the Sun, its maximum distance for this appearance.

Also on this night, the planet Mars will lie just 2° above Venus. (That’s approximately the width of one finger when held at arm’s length.) Using binoculars will help bring it to view because it glows less than 1 percent as Venus. The planet Saturn lurks approximately 10° to Venus’ right and the star Spica in the constellation Virgo sits 10° to Venus’ left. Both shine a little brighter than Mars but fall far short of dazzling Venus.

Although naked eyes and binoculars offer the best views of the evening scene, anyone with a small telescope will get a thrill from targeting Venus. At greatest elongation, Venus looks like a miniature version of a First Quarter Moon, with one half in sunlight and the other in darkness.

On the other hand, the planet Neptune will be in opposition (opposite the sun in the sky and closest to Earth) and will be highest in the sky at local midnight. This opposition is special because Neptune will be returning close to the spot where it was discovered in 1846, marking its first complete trip around the sun since its discovery.

To find Neptune,  look for the large but faint triangle of Capricornus, to the left of Sagittarius and the Milky Way around 1 a.m. this week. The two stars at the left end of the triangle point the way to Neptune, just a little bit short of and above the star Iota in the neighboring constellation Aquarius.

In a small telescope or even binoculars, Neptune will look just like a star; what gives it away is its distinctive blue-green color.

Happy planet hopping! 😀


sources:  SPACE.com, Astronomy.com news, EarthSky.org