[Prev][Next][Index][Thread]
(meteorobs) Worst Limiting Magnitude (was Re: NAMN - NASA Geminid Campaign)
Markku asked:
> I was wondering if there's a bordeline for bad Limiting Magnitude (due
> to light pollution, poor eyesight, mist, etc.) after which observed data
> is becoming guestionable/useless? Not that there would (ever) be any
> chance for clear skies in Finland.
In answer to Markku's question about "worst acceptable" Limiting Magnitude,
the answer is that FOR MAJOR SHOWER PEAKS, there really is NONE! (In prior
discussions on this list and elsewhere, it has been stated that IMO-style
analysis of data becomes difficult if one's LM is below 5.0. However, even
this restriction apparently falls away during major showers.)
Of course with that said, the IMO still clearly advises (on the same Web page
as I quoted in my last post, "http://www.imodot net/visual/major01.html"):
"Before starting any observations you should look for a dark-sky site,
since this will considerably improve your observations."
Thus seeking a better LM *is* important to your observation, because it will
increase the size of your meteor sample - as well as making your session more
FUN, and the sky more beautiful as well!
But don't choose NOT to observe a major shower, merely because you can't
find a dark site... Get whatever data you can - and enjoy doing it!
(One note: The IMO Guide does say that if your sky becomes more than 20%
obscured, you should take a break from observing: however, on a major shower
peak night, even this restriction is somewhat relaxed. If you feel like it,
then keep observing, and keep recording cloud obstructions, and you can
always throw out questionable data later!)
Clear (and dark) skies!
Lew
To UNSUBSCRIBE from the 'meteorobs' email list, use the Web form at:
http://www.tiacdot net/users/lewkaren/meteorobs/subscribe.html
References: