Jumat, 24 Desember 2010

QUADRANTIDS METEOR SHOWER on Jan4th, 2011

QUADRANTIDS METEOR SHOWER
 The Quadrantids are an above average shower, with up to 40 meteors per hour at their peak.
The shower usually peaks on January 3 & 4, but some meteors can be visible from January 1 - 5. Best viewing will be from a dark location after midnight. Look for meteors radiating from the constellation Bootes.

The source of the Quadrantid meteor shower was unknown until Dec. 2003 when Peter Jenniskens of the NASA Ames Research Center found evidence that Quadrantid meteoroids come from 2003 EH1, an "asteroid" that is probably a piece of a comet that broke apart some 500 years ago. Earth intersects the orbit of 2003 EH1 at a perpendicular angle, which means we quickly move through any debris. That's why the shower is so brief.
Details here:
http://meteorshowersonline.com/quadrantids.html

Kamis, 23 Desember 2010

RESULTS of the "scientist of the day"

STEPL (Space Technology and Education Pvt. Ltd.) conducted an experiment for school children as part of the Winter Solstice Day celebrations at Jantar Mantar on 22nd Dec by SPACE.

The competition titled 'Scientist of the Day' involved measuring the shadow of a long stick over a period of time and using the shortest shadow to find the Circumference of the Earth. This uses the concept that the sun rays shine directly overhead on the Tropic of Capricorn (the latitude line at 23.5° south, passing through Brazil, South Africa, and Australia) on the day of Winter Solstice. Younger students participated in a competition "Measuring the Sun Angle" which was a smaller part of the original one.

About 150 students from 21 schools from Delhi NCR participated in this competition, including schools such as The Airforce School, Subroto Park; DPS Sonepat; Ryan International School, Rohini; Step by Step, Noida; Apeejay School, Saket, etc. The students sat in groups amidst the green lawns surrounded by the ancient monuments and measured away for a couple of hours. It was a great experience for the teachers and students to be involved in such a project.

All the groups did a great job and attended to the measurements with attention and diligence. I am proud to announce the winners of these two competitions:

In Senior Section Ryan International School, Vasant Kunj won the first prize where as team 8 and team 7 from Ryan International School, Rohini got second and third prize respectively.

In Junior Section team 5 from The Air Force School, Subrato Park won the first prize where as team 15 and team 16 from Step By Step Greater Noida stood second and third prize respectively.

Earth will be at Perihelion on Jan 4th, 2011 (00:30 IST)

Earth will be at Perihelion on Jan 4th, 2011
 
You may know that we don’t have a circular orbit around the Sun. It is elliptical, that means at one point we are closest, and at another we are at the furthest point away. On January 3rd at 19:00 UT or January 4th at 00:30 IST, Earth will be at its closest point from the Sun on its' elliptical orbit around the Earth, which is known as Perihelion.
The Earth-Sun distance at that time is 147,093,590 km, which is about 5 million km closer than its farthest point in early July. However, this effect is much less significant than the effects due to the axial tilt of the Earth. Our seasons are determined primarily by the tilt of the Earth and not by how close or far the Earth is to the Sun.

To read in detail about Earth at Perihelion, find the attached document at the Google Calendar listing for this event here:
https://docs.google.com/document/edit?id=1IXUie0Takfd07MxIuvCzg3l-TgJ7_qcaRN4YKO2sVWY&hl=en
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