[AZ-Observing] Re: Recording Seeing Conditions (was WOW!)
- From: "Stanley A. Gorodenski" <stan_gorodenski@xxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Wed, 13 Jul 2005 09:03:12 -0800
I have some questions about this measure. For example, the "fainter
stars, equal to mag 6.0 are seen"? The way this is written, my
interpretation is that you need to look specifically at mag 6 stars.
This would be very difficult to do unless you know the sky extremely
well because if you cannot see them, it would be difficult to know where
they are supposed to be using a star chart. Also, although much more
numerous, it almost seems you would have the same problem finding mag
6.0 stars, or where they are supposed to be if you could see them, as
you would finding doubles.
Also, "the fainter parts of the Milky way are seen with averted vision"?
Which fainter part of the milky way are we talking about - the fainter,
faintest, or absolute faintest? This is sort of ambiguous because in
practice it appears a specific part of the milky way is not looked at,
but instead how much you see, e.g., "I could easily make the Milky Way
well into Cassiopeia". Finally, is using Zodiacal light a good measure
since seeing can change throughout the night?
I myself would find this measure difficult to use. E.g., which are the
fainter parts of the milky way? If I have never seen it on a 10 night
(how do I know it is a 10 night?) and studied the milky way structure
thoroughly on this one night and committed it to memory, it would be
very difficult using this measure, but this is just my own opinion.
Stan
rtejera@xxxxxxxxxxx wrote:
>I think we're looking at this issue from differing perspectives. From my =
>point of view, like Andrew, I'm just looking for a way to compare one =
>night with the next when I go back through my notes. The 1-10 scale =
>works well for this. It's been implied that this scale is very =
>arbitrary, but I would say, while not Scientifically valid it does have =
>certain guidelines to go by. Quoting from Steve's Definitions a 7 in =
>transparency is:" fainter stars, equal to mag 6.0 are seen and the =
>fainter parts of the Milky way are seen with averted vision, Zodiacal =
>Light Seen With averted vision" An 8: "Stars fainter than mag 6.0 are =
>just seen and the fainter parts of the Milky Way are more obvious, =
>Zodiacal Light is seen with direct vision"
>
>
>
--
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.
Other related posts:
