Open Cluster
Melotte 111
Coma Star Cluster
|
| Object : | Melotte 111 (C1222+263) |
| Coordinates/Direction : | RA: 12h22m, DEC: +25o51' |
| Object size : | 450' (7.5o) |
| Apparent magnitude : | 1.8 |
| Distance : | 280 ly |
| No solar mass : | 40 stars |
| Radius : | - ly |
| Find in constellation : | Coma Berenices |
| More to know : |
Wikipedia:
https://en.wikipedia.org/ wiki/ Coma_Star_Cluster |
| Exp. time : | 50x60 seconds, iso400, dithered every third image |
| Image process tool : | Siril, GraXpert, Gimp, Irfanview |
| Processing : | flat, astro metric color calibration, background |
| Weather : | Clear sky, Rel Humidity -, Moon Phase 63%, Temperature -3o C |
| Comment : |
Found an olda photo of the open cluster Melotte 111 that I haven't processed earlier.
The Galaxy to the left is NGC4564, also called the Needle Galaxy.
The bright star at middle top is gamma Comae Berenices with magnitude 4.3, it belongs to the constellation Coma Berenices.
The top part of the open cluster Mel111 starts at this star, the cluster has about 40 bright stars.
More objects can be seen at this plate solved image:
Astrometry.net plate solved it opens in a new window. |
| Lens/telescope : |
Nikon 50mm f/1.4 (set to f/2.0) |
| Corrector/Barlow : | none |
| Field (FOV) : | 12x12 degree, before cropping |
| Filter : | Red=25, Green=58 and Blue=47B filter |
| Camera : |
SpectraSource Instruments HPC-1, CCD 1024x1024
Camera from Stockholm University |
| Exp. time : | red 74x15s, green 74x20s, blue 74x30s, 3x8x8 dark, 3x8 flat+3x8x8 dark.
Small drift under exposures (see the edges) to get rid of those bad pixels, no IR-filter.
Photos taken under two separate nights. |
| Image process tool : | Matlab, All image processing done by my own developed Matlab routines. |
| Processing : |
resize, level, cal dark.
Image color calibrated with G2-stars as references (our Sun is a G2-star). |
| Weather : | clouds |
| Comment : |
This is my very very first digital deep sky photo.
A lot of galaxies can be seen.
Those galaxies with a lot of dust is colored purple because the lack of a blocking Infra red filter, dust radiate in IR. |
English
(click on the image to get a full resolution photo in a new window)