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Dates & Location

30th August - 25th Sept 2019 from the ICAstro site, Oria, Spain. Elevation 1022 m
Lat 38°:45.4 N, Long 00°:02.1W

Catalogue identification

LDN 1235
The Shark Nebula

In this image, North is up

Equipment Used

Tak FSQ106N at 530 mm focal length, F5.0.
Paramount ME German equatorial Mount.
Camera - Moravian Instruments G3-16200 with 7 position FW and OAG.
TheSkyX Pro telescope control.
SGP used for camera, PHD Guide and Focus control.

Starlight Instruments Boss Focuser with FSQ rear cell replacement.
Lodestar guide camera.



Where it is in space

This field is approx 178 x 141 arcminutes - ie ~ 6 x 4.5 Moon diameters
LDN 1235 lies approx 3 degrees NNE of Alfirk, the star at the Eastern base of the triangle of stars that form the top of the Cephus contellation.



Remote session using Splashtop control from Ravenshead, UK
Exposures: L: 30  x 20 min + R:G:B 12 x 10 min each for RGB stars master frame only

All sub-exposures
-20°C. All images binned 1x1.
Automated remote sessions using Sequence Generator Pro (SGP)


  What it is

With an uncanny resemblance to a shark, LDN 1235 is most likely an extended red emission nebula (ERE). ERE - galactic dark nebulae at high latitudes that become visible through illumination by the interstellar radiation field. Also shown in this image are two reflection nebulae, van den Bergh 149 (vdB 149) and vdB 150. These blue nebulae can be seen on the left side of the Dark Shark at top and bottom.

two loud.

Processing Methods

All data reduction with PixInsight. Lum, RGB masters and RGB colour combine prepared in PixInsight
Master NB colour created in PSCS6
Master (Lum+RGB) colour created in PhotoShop CS6.
DDP stretching, colour balancing and finishing
in PS CS6
DBE in PI for cleanin up background