| Description |
| Messier 13 (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of Hercules. Characteristics M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is 25,100 light-years away from Earth. |
| Object | M13 or NGC 6205 - Hercules Globular Cluster |
|---|---|
| Constellation: | Hercules |
| Position: | RA 16h 41m 41.24 DEC +36° 27′ 35.5″ |
| Apparent Size: | 145Lj = 20 arcmin |
| Apparent Magnitude: | +5.8 |
| Distance (average) | 22.2 kly |
| Photo Datas | |
| Date | 01.08.2016, 20:00 UTC |
| Location | Knottenried/Oberallgäu, 1002m ASL GPS: 47°36’13“ N, 10°11’24“ E |
| Sky darkness SQM-L | Object 20.5mag/sqrsec, Zenit 20.5mag/sqrsec |
| Ground Temp./Air Pressure | 15°C / |
| Thermal sky temp./weather | /high altitude haze |
| Seeing | |
| Telescope | Meade 8" SC ACF 2032mm f/10.0, no flattener |
| Camera | Sony A7R unmod @ T sensor=20°C |
| Expose frames | ISO 3200, RAW 4x120s, 2 darks, 2 flats |
| Total expose |
8 min. |
| Filter | no |
| Mount | FS2 |
| Guiding Cam | no |
| Software | DSS 3.3.4, Photoshop CC |
| Remarks | My first astro photo (quick shot) without proper features (not fully dark during astronomical twilight - poor seeing - high altitude haze). |
C 2016 Peter Cerveny