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Crescent, Saturn, Blue Flash nebulae and more NGCs


YKSE

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Forecast was another clear night sky yesterday before raining weekend, after preparing a list of 30 DSO, with primary objects in Sagittarius, Serpens, Scutum, Delphinus and Cygnus.

Arriving on dark site at around 9 o'clock, the sun had set a half hour ago, only Arcturus and Vega visible, good enough for alignment. The sky darkened to 19.3 around 10 o'clock and continued to about 21 at midnight and crystal clear all the time.

Starting with globulae, NGC 6539, a small faint fuzzy in 50x, 6535 was even smaller, with 6544 as the biggest of the three. 6642 is so small that it looked like a faint star, zooming up to 200x revealed the size. 6440, 6638 and 6712 were easier as the sky has darken to around 20.2.

Open cluster 6645 is a nice pack faint stars, while 6649 and 6664 dominates of brighter stars, 6568 was clearly fainter than it's 8.6 mag indicated, could though still be seen in direct vision.

Caldwell 57, also called Barnard's galaxy, is an irregular galaxy, located just above a nice pattern of bright stars, was readily seen in 50x.

Caldwell 27, the Crescent Nebula, slewing to the position with 40mm EP for 50x, there were a pool of stars as we're looking into our galaxy, it was spectacular! Nebulosity from faint stars were everywhere. Putting on UHC filter, most of the nebulosity disappeared, except a C-shape nebulosity, switching to 31mm for 68x with UHC, looking closely for a couple of more minutes, the nebula looked more having the shape of 22-day-old-moon, with fainter concave part, very nicely framed by the brighter stars nearby.

Caldwell 55, Saturn Nebula, easily seen in 50x without filter, very blueish color, UHC filter enhanced the nebulosity to some extend, cranking up mags to about 150x gave best constrast, it felt like looking at a blue Saturn with too high mag.

NGC 6905, Blue Flash Nebula, barely visible without filter, readily seen with UHC, just under a bright star, only a hint of blue, almost pale.

NGC 6857, a planetary nebula also called sh2-100, couldn't be identified without UHC, with UHC, it brightened(!) to look like a small globula.

NGC 7027, a young (about 600 years old) bright planetary nebula, easily seen without filter, like a bigger globula.

NGC 7008 and 6791, small planetary couldn't be identified without filter, and they poped out just like 6857 with UHC, even though not as bright.

20 new DSO in a little more than 2 hours, too bad that I had to get some rest before the ordinary 8-hours work.

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