Rosette Ha mosaic 6 sessions

2020-03-05T19:40:33+00:005 March 2020|Narrowband, Nebula, News, NGC Winter|

Still a work in progress. APP is great for doing these sorts of mosaics.
5000 pixel size reduced to 2000 for this.

Object IDNGC2244/2237
Rosette Nebula
Details6 sessions over Jan – March 2020
Telescope250mm f4.8 Newtonian
CameraAtik 460EX
Baader 7nm Ha filter
Exposure(s)Nominally 6 x 15 x 300s
but probably fewer since some will be discarded
ProcessingAPP, Photoshop

Cygnus Wall NGC 700 (Caldwell 20)

2019-09-21T16:27:20+00:0021 September 2019|Caldwell, Narrowband, Nebula, News, NGC Summer|

Part of the North America nebula – the Central America part – seems to be known as the Cygnus Wall. Can only fit a small part of this object in my FOV.

Object IDNGC 7000, C20
DetailsMag. 4
Size: 120′ x 100′
Telescope250mm f4.8 Newtonian
CameraAtik 460EX, Baader filters
Exposure(s)10x300s ea in Ha and OIII
ProcessingAPP, Photoshop
Mapped HOO and moved to the blue end

Cave Nebula Sh2-155 / Caldwell 9

2019-09-21T16:29:23+00:009 September 2019|Caldwell, Narrowband, Nebula, News, NGC Summer|

Sh2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula. Sh2 designation because it’s part of the Sharpless Catalog (1959) of 312 HII regions. About 2400 light years from Earth and a stellar nursery.

Narrowband filters really do cut through the murky, light polluted skies of Edinburgh so well. Obviously false colour, has to be for narrowband, but can’t decide which is the best so two different tone mappings: SII Ha OIII -> RGB and Ha OIII SII

Object IDCave Nebula
Sh2-155 / C9
Mag. 7.7, 50′ x 30′
Telescope250mm f4.8 Newtonian
CameraAtik 460EX
Exposure(s)10 x 180s each Ha OIII SII 2×2
ProcessingDSS, Nebulosity, Photoshop

NGC 6888 / Caldwell 27 Crescent Nebula SHO

2019-09-21T16:29:35+00:0028 August 2019|Caldwell, Narrowband, Nebula, News, NGC Summer|

A new one for me

Object IDNGC 6888
Crescent Nebula
Mag. 7.4, 18′ x 12′
Telescope250mm f4.8 Newtonian
CameraAtik 460EX
Exposure(s)7 x 300s each Ha, OIII, SII
ProcessingDSS, Nebulosity, Photoshop
Mapped SII, Ha, OIII -> RGB

B33 Horsehead in narrowband

2019-01-14T16:26:53+00:0014 January 2019|Dark nebula, Narrowband, Nebula, News, NGC Winter|

First real narrowband image. Strange reflections of the primary, secondary and spider in Ha and OIII images, as well as flats.
Mappings were OHS and HOS. SII didn’t add much to either image but object is strong in Ha and OIII.

Object IDB33 in IC343
Telescope250mm f4.8 Newtonian
Guided PHD2
CameraAtik 460EX
Baader Ha, OIII, SII filters
Exposure(s)15x200s 2×2 each filter
15 each of darks, flats, bias
ProcessingNebulosity and Photoshop
Colour mapping: