NGC 104 (Caldwell 106)
NGC 104 (also known as Caldwell 106; 47 Tucanae) is a globular cluster in the constellation Tucana. It has an apparent visual magnitude of 4.1 and its angular diameter is 50 arc-minutes. NGC 104 lies at an estimated distance of 13,000 light-years (+/- 1,000 light-years) and is 120 light years in diameter.
In the telescope, NGC 104 contains about ten thousand stars, many appearing within a small dense central core. The cluster may contain an intermediate-mass black hole.
The Equinox 2000 coordinates are 00h 24.1m, -72° 05´ which makes NGC 104 a Southern Hemisphere object that is best seen during the autumn. The Caldwell Autumn Star Chart shows the position of all Caldwell objects visible during that season. Visit the Caldwell Catalog Photo Gallery to see more objects from this catalog. As one of the more famous objects in the Caldwell Catalog, it is commonly known as the 47 Tucanae.
Technical Details
- Object: NGC 104
- Other Names: Caldwell 106; 47 Tucanae
- Object Type: globular cluster
- Object Data: Apparent Magnitude = 4.1, Angular Size = 50 arc-minutes
- Object Position (Equinox 2000): RA= 00h 24m, Dec= -72° 05´, Constellation = Tucana
- Date: 2020 Dec 10-15
- Location: Chile Remote Observatory, Observatorio El Sauce, Chile
- Partnership: Operated in partnership with David Churchill
- Telescope: Planewave CDK-17 (with Focal Reducer: f/4.5; FL = 1945mm)
- Camera: QHY 16200A with Integral 7-position Filter Wheel
- Mount: Astro-Physics 1600GTO
- Guider: Agena Starguide II / SBIG STi
- Sub-Exposures: Astronomik Filters
- Luminance: 36 x 5 min = 180 min
- Red: 24 x 5 min = 120 min
- Green: 25 x 5 min = 125 min
- Blue: 24 x 5 min = 120 min - Total Exposure: 9h 05m
- File Name: NGC104-CDK20-C01w.jpg
- Field of View: 38.9' x 58.3' at 0.64 arc-sec/pixel
- Original Image Size: 3630 x 4540 pixels (16.5 MP); 12.1" x 15.1" @ 300 dpi
- Data Acquisition: David Churchill
- Image Processing: Fred Espenak
- Maxim DL: Image Calibration, Stacking, Digital Development Processing
- Adobe Camera Raw: Noise Reduction
- Photoshop CC: Curves, Levels, Vibrance - Copyright: Fred Espenak