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| Messier/type: | M 20 / nebula and cluster |
| mag/dia/dist: | 6.3(cluster) / 20'x20'(nebula), 28'(cluster) / 5,000 ly |
| constellation: | Sagittarius |
| date/time/place: | Apr21,01 / 01:35 / bangkok |
| trans'y/seeing/l-poll: | good / fair / medium |
| telescope: | newtonian 4.5", f 8.8 |
| eyepieces/power: | 25mm / 40x |
| sky atlas page: | 22 |
M20: Trifid nebula. start from the tea pot lid star 22 'Kaus Borealis' hop to a star mag5 near B91
,further hop to stars 7 & 9 near M8, also M8 could appear in FOV of finder scope (6x30). star mag5 near B91,
star 7 and star mag5.5 near M20, these three stars form as imaginary right angle triangle. located star mag5.5
to the center of FOV, goto eyepiece and made final adjustment, M20 appeared as big cluster with nebulosity
,I couldn't see as Trifid as in text book.
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