Comet ISON, C/2012 S1 (ISON) At Perihelion Will Be Travelling 1/6 Slower Than Lovejoy, C/2011 W3, The ‘Great Comet of 2011’.

Dec2013x125

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by
Anura Guruge


Related posts:
>> Comet ISON speeds — Apr. 15, 2013.
>> Comet ISON smaller than hoped — Apr. 12, 2013.


C/2011 W3 (Lovejoy), primarily a southern hemisphere comet, on December 21, 2011, five days after perihelion.

C/2011 W3 (Lovejoy), in December 2011, and C/1843 D1 (Great March comet), in February 1843, went within 0.00085 AU [80,000 miles] of the Sun’s surface – 644,000 miles closer than will ISON!

These rank among the closest non-destructive cometary flybys of the Sun.

As Lovejoy approached perihelion it was travelling at 400 miles/second or 1.44 million miles/hour, 0.2% the speed of light.

At perihelion ISON, in contrast, will only be travelling at 63 miles/second — 225,750 mph. Part of this having to do with the greater separation from the Sun. Lovejoy was also 1/9th the size.

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About Anura Guruge

See 'The Blogger' on my https://nhlifefree.com/ blog.

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