NGC253 Sculptor Galaxy ("Silver Coin")
This photography was taken in 3 sessions, along approximately one year, using a Canon 600D modified camera and a 200mm F4 reflector telescope, from San Antonio de Areco, Buenos Aires, Argentina.
It is composed by 71 individual frames, with a total integration time of about 6 hours.
NGC253 (Sculptor Galaxy, also known as “Silver Coin Galaxy”) is a barred spiral galaxy at the austral constellation Sculptor, with an estimated distance of approximately 12 million light-years from Earth.
This galaxy shows a large quantity of interstellar dust on its arms and has a high rate of stars’creation (starbust).
It is the most brilliant member of the Sculptor Group, the galaxy cluster closer to the Local Group where our galaxy belongs.
This group is composed by other members, like NGC247. Since the gravitational interaction among the group members is relatively low, is believed it that it is actually a “filament” (a previous step to a group formation).
Previously was believed that some galaxies such as the irregular NGC55 and the spiral galaxy NGC300 were also part of this group, but new research shows that both galaxies (gravitationally tied between them) are really in the foreground.
This is the second or third galaxy with the highest absolute bright among the closest galaxies, being only surpassed by the Sombrero Galaxy and probably Andromeda. It is also one of the apparently bigger and brightest galaxies from our point of view.
In the annotated image, it is possible see around 50 galaxies on the background sky.
|Acquisition site||San Antonio de Areco, Buenos Aires, Argentina|
|Acquisition dates||10-17-2015 (x29)
|Instrument||Newton GSO F4 200 with GPU coma corrector.|
|Mount||Sky-Watcher NEQ6, managed by EQmod|
|Guide||Off-Axis, with Lodestar camera|
|Camera||Modified Canon 600D/T3i
No IR Filter (Full Spectrum mod, using Astronomik MC Clear)
Refrigerated (regulated temperature)
|Camera sensor temperature||0°C (on-sensor measured and regulated)|
|Filter||Astronomik Clip CLS CCD|
|Integration||71 x 5 minutes subframes - ISO 1600
Total integration time: 5 hs 55 minutes
|Calibration||49 flats, 300 bias, 53 darks.|
787 mm actual focal, 4.2 um x 4.2 um pixels
|Native size||5202 x 3465 pixels|
|Cropped size||4440 x 2975 pixels|
|FOV||81’ x 54’|
|Image center coordinates|| RA: 00h 47min 32sec
Dec: -25° 17' 10"