Kann mir jemand von Euch die Linien zuordnen?

Hat jemand von Euch eventuell ein schönes Spektrum einer HPS Lampe?

I'm an astronomer at Ohio Wesleyan University, which is about 20
miles north of Columbus. OWU owns and operates Perkins
Observatory (www.perkins-observatory.org), which houses a 32-inch
reflector. Because it's f/17, it's not very useful for CCD photometry as
the field of view is about 3x2 arcmin with our SBIG ST-8E. Thus, the
telescope is used mostly for visual observing by students and the
many visitors to our twice-weekly public programs. However, I do use
8-inch and 12-inch telescope on site for BVRI photometry.

To make a long story short, there is a strong possibility that a Wal-
Mart Supercenter and a Toyota dealership will be built within a mile
of the observatory to the south. The good news is that both would be
on land annexed by the city (pop. ~22,000) in which OWU is located
(the observatory is on the outskirts of town) and thus subject to lighting
code restrictions which would require them to use low-pressure sodium
lamps on 28-foot poles, as opposed to typical broad-spectrum parking
lot lights on 40-foot poles. (Wait until the Toyota dealer sees what his
cars look like under LPS light!) The bad news, of course, is that the
lovely yellow glow will still most likely annihilate the naked-eye views
from the observatory grounds and degrade telescopic views of objects
like galaxies and clusters.

I have two questions for the list. Any insight would be greatly
appreciated!

1. It seems to me that LPS lights should have a minimal effect on BRI
photometry, but that V might be a different story. Am I correct in my
thinking? Has anybody succeeded in doing good V-filter photometry
in the presence of strong LPS skyglow? Any tips?

2. Does anybody know of references for estimating the level of skyglow
from a given number of LPS lights at given wattages from a given
distance? It would certainly help me make my case more effectively in
community meetings if I could give some quantitative estimates of how
bright the skyglow will be. Alternatively, does anybody know of any
photos showing skyglow from LPS lights at a single large parking lot
from a mile or a few miles away? There aren't any comparable facilities
in my area.

Hallo Herr Ulrich, das Spektrum wurde mit einem Gitterspektrographen aufgenommen, eine Wellenlängenkalibrierung gibt es leider noch nicht. Die beiden gelben Linien sind mit Sicherheit nicht die beiden Natrium Linien, die haben nur 1nm Abstand und sind bei der Auflösung noch nicht zu trennen.

Hallo Liste, anbei ein Nachthimmelsspektrum aus Münster, aufgenommen mit einer Canon EOS 350D. Kann mir jemand von Euch die Linien zuordnen? Hat jemand von Euch eventuell ein schönes Spektrum einer HPS Lampe? Viele Grüße Gerd