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| Messier/type: | M4 / globular cluster |
| mag/dia/dist: | 5.4 / 35' / 6,800 ly |
| constellation: | Scorpius |
| date/time/place: | Feb 25, 01 / 05:30 / bangkok |
| trans'y/seeing/l-poll: | fair / fair / high |
| telescope: | newtonian 4.5" f8.8 |
| eyepieces/power: | 25mm / 40x |
| sky atlas page: | 22 |
Aim at Antares, look for brighter star close to Antares, it is star 20.
M4 locates at the top of imaginary triangle comprise of Antares, Star 20
and M4. At bangkok, M4 couldn't be observed in finder scope, then aim the
cross hair at its estimated location. Goto eyepiece, M4 easily appeared
like large, round, not condense at nucleus, couldn't resolve stars.
The small globular cluster mag9
'NGC 6144' just 0.5 degree northwest of Antares couldn't be observed.
Refer to text: Low concentration, extend 100 ly, age 10 billion years.
 |
| Messier/type: | M4 / globular cluster |
| mag/dia/dist: | 5.4 / 35' / 6,800 ly |
| constellation: | Scorpius |
| date/time/place: | Mar 25, 01 / 03:00 ,kirdkoa observatory kanchanaburi |
| trans'y/seeing/l-poll: | good / good / little |
| telescope: | orion short tube 80mm, f400mm |
| eyepieces/power: | 25mm / 16x |
| sky atlas page: | 22 |
aim at Antares, M4 appeared in FOV of finder scope. at Bangkok,it can't appear in finder scope
according to highly light pollution. it was very impressive to look at Antares mag1.1 in the same view
with M4 mag5.4 as it can't happen at my home site.
Antares is red giant star 600 ly from our sun with relative luminosity 10,000 times of the Sun.
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