BAA Observers Workshop

2015 September 26

Comets and Meteors


Slide notes


1)†††††† Some of what I say here may change as and when software developed by Nick James replaces the current CCD Astrometry

and Photometry procedure


Background is comet Bradfield


2)†††††† Just to let you know who is the real brains behind this


3)†††††† I use the SSON network but you can of course use your own instrument or any other robotic telescope which lets you image

in the clear


4)†††††† Plenty for you to read if you want a full understanding of how and why comet outbursts


5)†††††† Nuclear (m2) magnitudes from the Spanish groupís website


††††††††† As you can see this comet outbursts on a fairly regular basis so keep your eye on it and if you note a significant increase in

brightness let Richard Miles know immediately (but not in the middle of the night !!!)


6)†††††† This chart shows the variation in total (m1) magnitude over a similar time period as the previous chart


††††††††† The reason I included this chart is to bring the Comet Observation Database (COBS) to your attention and to encourage you

to input your observations to this database as well as sending them to the BAA Comet Section Director.


BAA data is being incorporated into this database as is that from other national organisations


7)†††††† The ones in red are of greatest interest currently


8)†††††† You can image the faster moving comets (2) < (1) and stack the images but I will mention why I donít do that later


††††††††† Warrumbungle has a smaller mirror and different pixel size than SSON therefore exposure times will be different but that is

explained in the procedure mentioned on this slide


9)†††††† SSON costs $1.67 per min Ė approx £1 therefore 50p per min with approved Robotic Telescope Project


10)†††† Total mag (m1) on may 14 ~ 12. can get as bright as mag 10


††††††††† Background stars interfering on April 29 so couldnít measure magnitude but obviously much, much fainter


11)†††† Stack images if not intending to work through rest of the CCD Astrometry and Photometry process but not if you intend to

continue as FoCAs, which you use after Astrometrica, canít handle stacked images