 |
|
|
| Object | M20- Trifid nebula |
| Info |
M20 is situated in the rich star field of the constellation Sagittarius. The defuse patch at the centre is illuminated by the double star HN 40, of 8th & 9th mag., born from the nebula. M20 gets its popular name The Trifid from its 3 dark dust lanes which trisect it. M20 lies 5200l.y. away, the same as M8 |
| Date | 9 & 10/ 5/ 05 |
| Location | BayTop Observatory- Streaky Bay South Australia |
| Instrument | Orion ED80 refractor working @ f7.5 |
| Mount | Vixen 'GPDX' controlled by a Mel Bartels Goto System |
| Camera (CCD) | Starlight Xpress HX516 monochrome with Hm, made filter slider |
| Exposures | L: 100' R:40' G:40' B:40' (5' sub exposures all unbinned) Dark frames removed. Extinction factors applied . |
| Guiding | Sky Watcher-f5 ST Refractor & a Meade LPI imager attached with main scope on a home made accessory plate |
| Filters | Astronomik Type 2 CL-.RGB set |
| Notes/ Conditions |
Conditions- On the 9th conditions started out average then clouds rolled in as I complete my last luminance exposure. The evening of the 10th was steady with reasonable seeing at first then a heavy dew came in as I was finishing off the last of the colour frames. Object @ 60deg. Both the rgb sets and lum have been 'drizzle combined' coefficient resampled to 120% in IRIS. |