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Re: (meteorobs) JBO observation at Xinglong, China (ZHUJI, June 28/29)

Hi, Jure,

You're generally right.
Our observing site in Xinglong was at a station on the top of a mountain, which is also the largest observatory in China. The milky way is usually visible in fairly bright twilight, even when we can only saw Mars, Vega, Altair and Deneb. In most clear nights, the whole sky, including most low-elevated areas such as the entire constellation of Sagittarius and Scorpio. The day before yesterday, i just noticed that in fact, the milky way was visible from the north horizon to the south horizon...
LM5 in downtown Beijing is extremely rare. Perhaps 1-5 days(?) per year as my experience. The best condition in Beijing that i've ever met was in 1998, with LM=5.3. But the milky way cannot be seen still.

I suppose this phenomenon was related to the dust density in the atmosphere, and the scattering of light pollution. At out observing site, the peak in Xinglong, it is very clear that a restricted area low in southwest was brighter than normal background. That's just the direction of Beijing...

Kind regards,
Huan



----- Original Message ----- 
From: "Jure Atanackov" <jureatanackov@emaildot si>
To: <meteorobs@atmob.org>
Sent: Monday, June 30, 2003 9:05 PM
Subject: Re: (meteorobs) JBO observation at Xinglong, China (ZHUJI, June 28/29)


> e.g. limiting magnitude of
> 1, the milky way is still visible. In contrast, the milky way can never be  
> seen even with LM of better than 5 in downtown of Beijing. 
Huh? Excuse me? You mean, you can just see Altair and you cannot see Deneb, but 
you can see the Milky Way?? LM5 in downtown Beijing??

I can just see the bright parts of Milky way in Cygnus with LM5.2 or so, worse 
than that, it disappears. I can't see the Sagittarius region well because it's 
low in the south. Also, I can just see mag 5.0 or so stars from downtown 
Ljubljana with 'only' 270.000 population when the sky is really clear. Forget 
Milky Way. 

Do you use direct or averted vision for your LM counts?

CS!Jure

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