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Open Cluster |
| Object : | Melotte 20 (Collinder 39) |
| Coordinates/Direction : | RA: 03h26m, DEC: +48o48' |
| Object size : | 366' (6.1o) |
| Apparent magnitude : | 1.2 |
| Distance : | 570 ly |
| No solar mass : | 570 stars |
| Radius : | 18 ly |
| Find in constellation : | Perseus |
| More to know : |
Wikipedia: https://en.wikipedia.org/ wiki/ Alpha Persei Cluster https://en.wikipedia.org/ wiki/ Mirfak |
Melotte 20 with Mirfak in center, 2024-08-28
(click on the image to get a full resolution photo in a new window) |
| Date : | 2024-08-28, 2024-08-30 |
| Time (UT) : | - |
| Mount : | SkyWatcher EQ6 Pro, Beltdrive (DIY 2019) |
| Guide : | QHY5 camera with 200 mm f/3.5 lens |
| Lens/telescope : | Pentax 645 300 mm ED f/4 (set to f/4) |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5o (full frame) before crop |
| camera : | Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit |
| camera temperature: | About 6o C above surrounding temperature |
| Film/CCD : | Raw, Cr2 |
| Filter : | none |
| Control system: | Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux) |
| Exp. time : | 85x60 seconds, iso1600, dithered every third image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | synthetic bias, flat, astro metric color calibration |
| Weather : | clear, temperature 17 degree C |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | The open cluster Melotte 20 with the star Mirfak in center. The star is also named Alpha Persei and is a member to the constellation Perseus. It's a giant star at a distance of 510 ly from our Sun. It's surrounded of a lot of stars which make it beautiful to look at. This lens compare to the earlier only has half the fov which is a bit narrow for this object. |
Melotte 20, 2017-08-19
(click on the image to get a full resolution photo in a new window) |
| Date : | 2017-08-19 |
| Time (UT) : | 23:10 - 23:26 |
| Mount : | SkyWatcher Star Adventurer, light weight mount |
| Lens/telescope : | Sigma APO 150 mm f/2.8 (set to f/4) |
| Corrector/Barlow : | - |
| Field (FOV) : | 13.6x9.1o (full frame) before crop |
| camera : | Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit |
| camera temperature: | About 6o C above surrounding temperature |
| Film/CCD : | Raw, Cr2 |
| Filter : | none |
| Control system : | Camera focus by Canon Remote APP, camera exposure by intervallometer |
| Exp. time : | 15x60 seconds, iso800 |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | synthetic bias, flat, astro metric color calibration |
| Weather : | clear, temperature +13 degree C |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | One of few photos taken with my Sigma 150 mm APO lens. The fov of this lens correspond well to this object, the fov is twice the size of the object. The bright star at up in the middle is Alpha Persei, or Mirfak. Best to look at it in full resolution. |
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