Messier/type:M 26 / open cluster
mag/dia/dist:8.0 / 8' / 5,000 ly
constellation:Scutum
date/time/place:Jul 19, 01 / 10:50 / bangkok
trans'y/seeing/l-poll:low-medium / good / low
telescope:newtonian 4.5", f 8.8
eyepieces/power:25mm, 10mm / 40x, 100x
sky atlas page:15 & 22
Start star hopping from tea pot's handle stars 34, 38, 27 & 40 (in Sagittarius). Star 38-->star 27-->point to star 22 'Kaus Borealis' the tea pot lid. Hop to star 13, 15 & 16-->three stars mag6 in M24-->a star mag5 near M17. [between star 22 & 13, I stopped at M8 the lagoon nebula, it was very bright, this confirm the sky condition was good. Also, I rest at M24 but couldn't identify the s-shape of brightest part of star cloud]. Then hop to star gamma in Scutum-->double star in IC1287-->then hop to star alpha, delta & epsilon. M26 locates between delta & epsilon, These formed as small triangle which distance from delta to epsilon equal to delta to M26. At eyepiece 40x, M26 appeared like a star with a little nebulosity surrounding. then I changed to 100x to confirm, two more stars could be resolved and bigger nebulosity elongated in east-west direction. When compare to REDSHIFT III (as below picture, north is up) The bright stars at center are foreground stars mag9.13, 10.12 & 10.21 at distance 1,690, 68 & 265 ly respectively. The three reference filed stars are in correct position.
Image from REDSHIFT III, selected star form tycho & hipparcos catalog set filer to show stars under mag10.5 to match with real sky at observation session above.
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