Caldwell

/Caldwell

NGC 6992/6995 Eastern Veil (C33)

By |2019-10-01T14:56:40+00:001 October 2019|Categories: Caldwell, Nebula, News, NGC Summer|

Could only fit part in the FOV

Object ID NGC 6992/6995 Eastern Veil, Caldwell 33
Details Size 60’ x 8′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX -16C
Exposure(s) 10x180s ea RGB 1×1
Capture APT
Processing APP, Photoshop
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Cygnus Wall NGC 700 (Caldwell 20)

By |2019-09-21T16:27:20+00:0021 September 2019|Categories: 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 ID NGC 7000, C20
Details Mag. 4
Size: 120′ x 100′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX, Baader filters
-15C
Exposure(s) 10x300s ea in Ha and OIII
Capture APT
Processing APP, Photoshop
Mapped HOO and moved to the blue end
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Cave Nebula Sh2-155 / Caldwell 9

By |2019-09-21T16:29:23+00:009 September 2019|Categories: 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 ID Cave Nebula
Sh2-155 / C9
Details Cepheus
Mag. 7.7, 50′ x 30′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX
Exposure(s) 10 x 180s each Ha OIII SII 2×2
Capture APT
Processing DSS, Nebulosity, Photoshop
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Iris Nebula NGC 7023 / Caldwell 4

By |2019-08-29T12:59:19+00:0029 August 2019|Categories: Caldwell, Nebula, News, NGC Summer|

Been meaning to do this one for ages. Not easy because the background gas and dust can be easily lost in the light pollution and noise.

“The Iris Nebula, also known as NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +6.8 star, SAO 19158.”
Wikipedia

Object ID Iris Nebula
NGC 7023 / C4
Details Cepheus
Mag. 6.8, 18′ x 18′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX
Exposure(s) 10 x 180s each RGB 1×1
Capture APT
Processing Nebulosity, Photoshop
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Cocoon nebula IC5146 / Caldwell 19 RGB

By |2019-08-29T12:55:55+00:0028 August 2019|Categories: Caldwell, Nebula, News, NGC Summer|

“IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula.”
Wikipedia

Object ID Cocoon Nebula
IC 5146 / C19
Details Cygnus
Mag. 7.2, 12′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX
Exposure(s) 9 or 10 x 180s each RGB 1×1
Capture APT
Processing Nebulosity, Photoshop
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NGC 6888 / Caldwell 27 Crescent Nebula SHO

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

A new one for me

Object ID NGC 6888
Crescent Nebula
Details Cygnus
Mag. 7.4, 18′ x 12′
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX
Exposure(s) 7 x 300s each Ha, OIII, SII
Capture APT
Processing DSS, Nebulosity, Photoshop
Mapped SII, Ha, OIII -> RGB
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Cygnus Wall – red channel only

By |2019-08-29T12:07:54+00:0023 July 2019|Categories: Caldwell, Nebula, News, NGC Summer|

After gathering HOYS-CAPS data thought I’d give this a quick go in red channel only.

Object ID Cygnus Wall
Details “Mexico and Central American” part of North America Nebula
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX
IDAS P2 LP filter
8x180s 2×2, darks, bias, flats
-11C
Capture APT
Processing Nebulosity, Photoshop
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NGC4565 / Caldwell 38 Spindle Galaxy

By |2019-04-01T16:19:57+00:001 April 2019|Categories: Caldwell, Galaxy, News|

Processed 3 different ways – give different results, not sure which I like best. Still too noisy – need many more exposures.
Interesting edge-on spiral galaxy in Coma Berenices, surprisingly large (14.9′ x 2′) but faint (9.60 but surface brightness 13.3). It is actually intrinsically more luminous than the Andromeda Galaxy. First seen by William Herschel in 1785. Also visible lower right is NGC 4562.

Object ID NGC 4565, Caldwell 38 Spindle Galaxy
Details 2019-03-31
Telescope 203mm RC8 f8
Camera Atik 460Ex @-20C
Badder RGB filters
IDAS P2 LP filter
Exposure(s) 10x240s 2×2 RGB
Darks
Capture APT
Processing Nebulosity, Photoshop
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Bubble nebula project 2 (NGC 7635)

By |2018-10-09T13:00:28+00:0024 September 2018|Categories: Caldwell, Nebula, News, NGC Autumn|

Added 18 frames of Ha. Much more detail and less noise.

Object ID NGC 7635 Bubble nebula (C11)
Mag. 10, Size 15’x8′
H II region emission nebula
Cassiopeia
Details 2018-09-23 21:15-23:07 UT
Bright moonlight
Telescope 200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
Camera Atik 460EX, Baader 7nm Ha filter
Exposure(s) 18 x 300s
darks, flats
Capture APT
Processing Nebulosity 4, Photoshop

I did take some RGB colour but as you can see below there is a huge dust mark in it. Normally not a problem as flats will remove it. But when I went to create flats, the dust had disappeared so very difficult to remove. Unless it’s not dust but an out of focus reflection of the bright star? If it is I’ve never seen anything like it in my images before.

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Bubble nebula project (NGC 7635)

By |2018-09-23T16:38:33+00:0023 September 2018|Categories: Caldwell, Nebula, News, NGC Autumn|

One of my favourite objects. Trying to do this over a series of nights. Ha first of all then add colour channels. Only 2x300s exposures in Ha so far.

Object ID NGC 7635 Bubble nebula (C11)
Mag. 10, Size 15’x8′
H II region emission nebula
Cassiopeia
Details 2018-09-22 21:40-21:45 UT
Bright moonlight
Telescope 200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
Camera Atik 460EX, Baader 7nm Ha filter
Exposure(s) 2 x 300s
darks, flats
Capture APT
Processing Nebulosity 4, Photoshop
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