Thursday Night At Pinos/Light PollutionPosted By Rod Kaufman |
With very good conditions predicted by weather service and the clear sky clock, I decided to observe from Mt Pinos on Thursday evening, despite the presence of a 28% illuminated crescent moon. Since the moon was setting at around midnight anyway, I didn't feel it was posing much of an obstacle.
I thought I was going to be solo up on the mountain but a gentleman and his family arrived with a C8 and set up next to me which made for some good company
Seeing conditions were, for the most part, excellent. Although a steady breeze persisted until midnight, seeing remained very stable and Saturn appeared refractor-like in my 16" f4.5 dob. I was able to view it throughout most of the evening with 6 and 4mm eyepieces and the cassini's division appeared inky black while the clouds bands on the planet displayed delicate structure. Saturn's moons appeared pinpoint even at high power. I recall Steve Kennedy remarking that breezy conditions can help remove the boundary layer at the primary and improve resolution. The latter seemed to be at play last night.
Despite good seeing and transparency, the sky was quite luminous and I'm not sure why. The sky quality meter registered 21.15 at 2:00am and that's not good. There appeared to be a lot of sky glow emanating from Bakersfield but the entire sky appeared relatively bright and DSO's appeared washed-out except near the zenith. I'm not sure if there's been new development in or near Bakersfield but the skyglow from that direction was intense. :C
I could still see relatively good detail in galaxies that were riding high in the sky such as in ursa major and canes venati but I could barely make out the milky way in cygnus as it was rising at 2:00am :S
I'm not quite sure why the sky was so luminous but I hope it was just a quirk and not a trend...
I thought I was going to be solo up on the mountain but a gentleman and his family arrived with a C8 and set up next to me which made for some good company
Seeing conditions were, for the most part, excellent. Although a steady breeze persisted until midnight, seeing remained very stable and Saturn appeared refractor-like in my 16" f4.5 dob. I was able to view it throughout most of the evening with 6 and 4mm eyepieces and the cassini's division appeared inky black while the clouds bands on the planet displayed delicate structure. Saturn's moons appeared pinpoint even at high power. I recall Steve Kennedy remarking that breezy conditions can help remove the boundary layer at the primary and improve resolution. The latter seemed to be at play last night.
Despite good seeing and transparency, the sky was quite luminous and I'm not sure why. The sky quality meter registered 21.15 at 2:00am and that's not good. There appeared to be a lot of sky glow emanating from Bakersfield but the entire sky appeared relatively bright and DSO's appeared washed-out except near the zenith. I'm not sure if there's been new development in or near Bakersfield but the skyglow from that direction was intense. :C
I could still see relatively good detail in galaxies that were riding high in the sky such as in ursa major and canes venati but I could barely make out the milky way in cygnus as it was rising at 2:00am :S
I'm not quite sure why the sky was so luminous but I hope it was just a quirk and not a trend...