[BAA Comets] Comet magnitudes

Roger Dymock roger.dymock at ntlworld.com
Mon Feb 3 14:49:30 GMT 2014


While investigating the use of Iris to measure comets magnitudes I have noticed that large, bright
comets have a number of stars in their comae. Therefore a couple of questions;
- how does one 'remove' the effect of such stars so as to produce a more accurate value for the
total magnitude of the comet?
- if we are looking for a Visual Equivalent Magnitude should we do so as visual observers will be
estimating the total magnitude including any stars in the coma (or are they)?

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/





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