image to see the full size picture (1.57"/pixel).
|M20 - The Trifid Nebula
in Sagittarius, 19.06.2002 (23:29 - 23:43 UT)
Resolution: 3.14 arcsec/pixel
675SC2 + 0.6FR
Telescope: 8" F6 Orion Europa Newtonian
Result focal ratio: F3.6
Exposure: 11x25s (gain 100%), AMP OFF, 20xDF, FF
Seeing: lim.magnitude for naked eye 4.2, windy,
foggy clouds, 9 days old Moon!
1, Stacked with K3CCDTools, exported
2, Histogram (MaximDL Demo)
3, Brightness-Contrast-Intesity balance (-4;15;25)
in Corel PhotoPaint
4, Result image was filtered by Neat Image
M20 is a red emission nebula surrounded by blue
reflection nebula (at the northern end). Its
distance is uncertain, the mean estimated value
is about 5200 ly. Visual brightness is 6.3 mag.
The nebula veils a great potential for astrophoto
- this photo was taken during Moon's shine 2 days
after 1-st quarter Moon, while the M20 was only
17° above horizon.