[BAA Comets] Comet 117P/Helin-Roman-Alu

[amar sharma]

Hello All,

Thanks to Roger's intimation and me being with the CCD during the night, I had a go at 117/P thinking it will be too faint for me and my conditions.

However, I was impressed to see a tail, which will be bettered in longer exposures and from darker skies [I am limited against both; non-guiding and background glow in our skies].

https://picasaweb.google.com/100263423283309558687/FaintCometsAndSupernovae#5855542091238648290

or

http://tinyurl.com/c8ko8m9

I got it in 2 minute sub-exposures with our C-14 and SBIG ST8XME. How do I estimate the tail length? The above image is cropped.

You should get better of the tail in 3 minute and more exposures from darker skies. Reminiscent of 49/P H-M-P and 19/P Borrelly at a time. Do post your images.

Thanks, Amar A. Sharma.

--- On Thu, 14/3/13, Roger Dymock <roger.dymock at ntlworld.com> wrote:

From: Roger Dymock <roger.dymock at ntlworld.com>
Subject: [BAA Comets] Comet 117P/Helin-Roman-Alu
To: comets-disc at britastro.org
Date: Thursday, 14 March, 2013, 9:47 PM

Might be worth imaging as it appears to be brightening (1 mag brighter than JPL
Horizons predictions) and has a decent tail.

Regards

Roger Dymock
Email: roger.dymock at ntlworld.com
Tel: 023 92647986
Skype: rjvdymock
MPC Observatory Code: 940
Project Alcock http://www.britastro.org/projectalcock/



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