Observatory Oberallgäu - First visual light and alignment of the Williams refractor on the mount (by Peter Oertel).
First photographic light of the Williams refractor, no flattener!
Full moon was two hands width aside and produced bright background 17.0mag/sqrsec.
Nevertheless we did a quick shot of 80 seconds.
| Object | M42 - Orion Nebula - First Light |
|---|---|
| Constellation: | Orion |
| Position: | RA 5h 35,3m DEC −5° 23,5′ |
| Apparent Size: | 60 arcmin |
| Apparent Magnitude: | +4.0 |
| Distance (average) | 1350 ± 23 ly |
| Photo Datas | |
| Date | 12.12.2016, 20:06 UTC |
| Location | Knottenried/Oberallgäu, 1002m ASL GPS: 47°36’13“ N, 10°11’24“ E |
| Sky darkness SQM-L | Object 17.0mag/sqrsec (full moon) |
| Ground Temp./Air Pressure | -2.0°C / mbar |
| Thermal sky temp./weather | -62.1°C Zenit |
| Seeing (Bortle) | |
| Telescope | Williams FLT 110/770mm f/7.0 |
| Camera | Sony A7Ra mod @ T sensor=2.5°C |
| Expose frames | ISO 3200, RAW 8x10s, 4 darks |
| Total expose |
1 min 20s |
| Filter | no |
| Mount | HPS 10Micron GM 3000 |
| Guiding Cam | no |
| Software | DSS 3.3.4, Photoshop CC |
| Remarks | Full moon two hand width aside First light of the Williams refractor, no flattener! |
C 2016 Peter Cerveny