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| Messier/type: | M13 / globular cluster |
| mag/dia/dist: | 5.8 / 21' / 23,400 ly |
| constellation: | Hercules |
| date/time/place: | Feb24,01 / 04:00 / bangkok |
| trans'y/seeing/l-poll: | fair / fair / high |
| telescope: | newtonian 4.5", f 8.8 |
| eyepieces/power: | 25mm / 40x |
| sky atlas page: | 7 & 8 |
From sky atlas p.8,started from Arcturus ,hop to stars 22, 26 and 36, hop to 43,41,46 & 45
and then to 48. further hop to 2,1,3,5 in corona borealis constellation, hop to 8,10 & 13
change to use sky atlas p.8,hop from 10,13 to 14,15 then to 16,17 & 20. continue hop to 25,44
in hercules constellation, M3 locates at right angle corner of imaginary
right triangle which comprise of 44,25 & M13. aim expected location of M13 to center of
finder scope ,goto eyepiece, M13 clearly appear as round, big and bright center.
at 100x, still can't resolve stars. at 40x was better for contrast & brightness.
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