Messier/type:M7 / open cluster
mag/dia/dist:3.3 / 80' / 780 ly
constellation:scorpius
date/time/place:Feb 25, 01 / 05:30 / bangkok
trans'y/seeing/l-poll:fair / fair / medium
telescope:newtonian 4.5" f8.8
eyepieces/power:25mm / 40x
sky atlas page:22
start at scorpian's tail stars 35 & 34, Star 35 is brighter than star 34. Star 34-->star 35-->point to-->M7 which easily to see via finder scope. At eyepiece, M7 appeared as very large cluster, bright stars in central area form like Christmas tree in east-west direction, the top is in east.
Refer to text: 80 stars detached, very large, very bright, max mag5.6, extend 20 ly, age 220 million years. Home
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