If you’ve read a lot of material out there on comets or seen some lovely images of Comet Lovejoy C2014/Q2 lately, you’ve noticed beautiful green colors in most of these images. Most astronomers and astronomer magazines ( NASA included ) attribute it to emissions from a chemical cyanogen. Cyanogen according to astronomers is radical containing one carbon and one Nitrogen atom . In reality it is NC-CN. The C & N molecules linked by triple bonds. What is more funny is that the green does not come from cyanogen. Here is a picture of what the visible spectrum of Comey Lovejoy looks like. Thanks to Vikrant Agnihotri of Cepheids Astronomy Group for this
Compare this to work done by physicist W.Swan in 1856, who researched emissions from C-C dimers and published their visible spectrum.
As you can tell the images are an exact match. Emission Peaks appear at 520 nm with satellite bands on either side. This wavelength corresponds to what we perceive as “green”. Astronomers seem to have gotten their chemistry totally wrong and its surprising how long this myth has been propagating
Earth is passing through a debris field of meteors left behind by Comet Thatcher (C/1861 G1). These meteors manifest themselves to us as a Lyrids. Expected activity at peak is 10-20 meteors per hour. But since the weather is nice and warm outside AT NIGHT, its officially time to go out and enjoy these space rocks with friends and family.
Lyrids seem to radiate from the bright star Vega in Lyra ( hence the name Lyrids ). For those who are not that interesting in meteors should know that what they lack in activity they make up in brightness. Lyrid meteors are usually bright and chances of seeing fireballs are good.
In 2004, astronomers at Kitt Peak Observatory in Arizona, USA discovered a near earth asteroid, dubiously named 99942 Apophis. The asteroid is about 200 m across in diameter. It became famous for being an asteroid with a rating of 4 on the Torino Imapact Hazard scale. Since 2006, the asteroid had been demoted to 0. However recent studies into the asteroid’s orbit has questioned the accuracy of this rating. Scientist in Russia think that there is a very real chance this asteroid will impact earth in 2036.
This observation has been refuted by NASA. According to Donald Yeomans, director of NASA’s near earth objects office claims that the probability of impact is currently 1/250,000.
Apophis will come within 5 earth radii distance of the earth in 2029. However if the asteroid passes within a region of space called the “keyhole” during this period, the orbit might change enough to cause impact with earth.
The predicted date of impact is April 13, 2036.
Apophis carries a massive Kinetic energy of 5.1e+02 Mega Tonnes of TNT equivalent. To put numbers in perspective, the Hiroshima nuclear bomb had a 20 Kilo tonnes yield.
However from preliminary calculations we did based on this article, a Apophis class asteroid will create a 4 Km wide impact crater on a direct hit.