[BAA Comets] Paper on ArXiv today on Comet C/2012 S1 (ISON)

[Roger Dymock]

Hi Jeremy,

Bored with variable stars ?!?! I can understand that.  

Regards

Roger Dymock
Email: roger.dymock at ntlworld.com
Tel: 023 92647986
Skype: rogerdymock67 or
Skype: rjvdymock
MPC Observatory Code: 940
Project Alcock http://www.britastro.org/projectalcock/


-----Original Message-----
From: comets-disc-bounces at britastro.org [mailto:comets-disc-bounces at britastro.org] On Behalf Of
Jeremy Shears
Sent: 14 May 2014 10:16
To: comets-disc at britastro.org
Subject: [BAA Comets] Paper on ArXiv today on Comet C/2012 S1 (ISON)

In case of interest:
Sungrazer Comet C/2012 S1 (ISON): Curve of light, nucleus size, rotation and peculiar structures in
the coma and tailToni Scarmato(Submitted on 13 May 2014)We present our results for comet (ISON). Our
results were obtained with amateur telescopes observing from the ground, before and after the comet
had passed conjunction with the Sun in August 2013. We measured a mean radius of 830 +- 245 m, and
we have identified a persistent structure in the direction of the sun with a preliminary rotation
period of approximately 3 days. In the tail are visible peculiar structures linked to the production
of dust by the nucleus. Our data Af(rho) (AHearn et al. 1984), a physical parameter that indicates
the amount of dust produced, is approximately 500+-50 cm in the quite phase which means a production
Qdust=500kgxsec^-1 equal to 43.2x10^6 kg per day. A considerable amount for a small comet. We have
also detected two major outbursts in January, 2013 and November, 2013, and minor outbursts throughou
 t the observation period. Key words: General: general; comets: C2012 S1 (ISON), ISON, comets,
afrho, photometry of aperture, flux, apparent magnitude, absolute magnitude, fragmentation

See: http://arxiv.org/abs/1405.3112 		 	   		  
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