Dinium Observatory is a private backyard observatory on Rennesøy (Isle of Rennes) in south-west Norway.
The 0.62 meter primary mirror is currently in the polishing stage. When completed, Dinium Observatory will be the largest research-grade optical telescope in Norway, with unsurpassed pointing and tracking accuracy.
IC 1805 The Heart Nebula
Narrow-band image of IC 1805. North is down.
Interference from clouds reduced the number of sub-exposures for ionized sulphur (SII) and oxygen (OIII).
Date: 16 December 2017
Loc: Isle of Rennes (Rennesøy), Rogaland, Norway
Telescope: Skywatcher Esprit ED 120 mm f/7 apochromat
Mount: ASA DDM160
Camera: Apogee U16M, CCD temp -30 C
Exposure: Ha, OIII, SII 50/40/20 min
Fine grinding with a fixed-post grinding machine
Portland cement polishing tool
The pitch lap is cast as individual squares on the cement tool. Although this method is very time consuming, it avoids the risk of thermal shock to the cellular mirror blank.
We humans have sent many tonnes of technology into orbit from 1957 to the present, - more than 5000 satellites.
During a 4.4 hour exposure covering 6.25 square degrees of sky, many old and new satellites cross the field.
Photo: RW Williams, 8-9 April 2019
Time: 20.55 - 02.28 UT
Equipment: Esprit 120 ED + Apogee U16M
This is mosaic of seventeen lunar images, each of which consists of more than one hundred images stacked and processed in AviStack2. Composited digital resolution is 5200 x 6500 pixels.
Observatory: private, backyard
Site: Isle of Rennes, SW Norway
Altitude: 40 m
Enclosure: 4.0 m ScopeDome
Type: Optical telescope
Optical design: Standard Cassegrain w/corrected prime and Cass focus
Diameter Primary: 0.62 m
Material Primary: Schott Borofloat
Diameter Secondary: 0.2 m
Material Secondary: Borosilicate
Mount: GEM-type ASA DDM160 high torque, direct-drive
First Light of the 62cm: March 2020
Active Optics: No
Camera: 16 Megapixels Apogee U16M (4000x4000 pixel CCD detector)
Filters: Chroma Ha, OIII, SII, Lum, R, G, B