NGC Autumn

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NGC Autumn2017-01-31T10:52:41+00:00

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Fish head nebula (IC1795)

This is a bit of a weird looking one! Stars to the left aren’t good shapes – probably combination of optical alignment, focus and collimation. Stars are over-processed too – should have been so much better.

Object IDIC1695 Fish head nebula (part of the Heart nebula)
DetailsSize 12’x12′
Cassiopeia
Telescope250mm f4.8 Newtonian
CameraAtik 460EX -15C
Exposure(s)20x300s ea Ha, OIII 2×2
darks, flats, bias
CaptureAPT
ProcessingAPP, Photoshop
Processed SHO with synthetic SII
5 December 2019|Nebula, News, NGC Autumn|

NGC 281 (Pacman nebula) in RGB

Few things wrong. Poor seeing, bloated stars, gusty wind,…

Object IDNGC 281 Pacman nebula (IC11)
Mag. 10, Size 35′
H II region emission nebula
Contains open cluster NGC 1590
Cassiopeia
Details2018-10-10
Poor seeing and transparency
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraAtik 460EX, Baader RGB  filters
Exposure(s)15 x 120s each colour
darks, flats
CaptureAPT
ProcessingNebulosity 4, Photoshop
11 October 2018|Nebula, News, NGC Autumn|

NGC 281 (Pacman nebula) in Ha

Best night for ages.

Object IDNGC 281 Pacman nebula (IC11)
Mag. 10, Size 35′
H II region emission nebula
Contains open cluster NGC 1590
Cassiopeia
Details2018-10-06 22:03-23:41 UT
No moonlight and good transparency
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraAtik 460EX, Baader 7nm Ha filter
Exposure(s)19 x 300s
darks, flats
CaptureAPT
ProcessingNebulosity 4, Photoshop

NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way’s Perseus Spiral Arm. This 20×30 arcmin sized nebulosity is also associated with open cluster IC 1590, several Bok globules and the multiple star, B 1. It collectively forms Sh2-184,[3] spanning over a larger area of 40 arcmin.[4] A recent distance from radio parallaxes of water masers at 22 GHz made during 2014 is estimated it lies 2.82±0.20 kpc. (9200 ly.) from us.[5] Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

E. E. Barnard discovered this nebula in August 1883, who described it as “a large faint nebula, very diffuse.” Multiple star ‘B 1’ or β 1 was later discovered by S. W. Burnham, whose bright component is identified as the highly luminous O6 spectral class star, HD 5005 or HIP 4121. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 arcsec. There has been no appreciable change in this quintuple system since the first measures were made in 1875.
Wikipedia

8 October 2018|Nebula, News, NGC Autumn|

Bubble nebula project 2 (NGC 7635)

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

Object IDNGC 7635 Bubble nebula (C11)
Mag. 10, Size 15’x8′
H II region emission nebula
Cassiopeia
Details2018-09-23 21:15-23:07 UT
Bright moonlight
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraAtik 460EX, Baader 7nm Ha filter
Exposure(s)18 x 300s
darks, flats
CaptureAPT
ProcessingNebulosity 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.

24 September 2018|Caldwell, Nebula, News, NGC Autumn|

Bubble nebula project (NGC 7635)

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 IDNGC 7635 Bubble nebula (C11)
Mag. 10, Size 15’x8′
H II region emission nebula
Cassiopeia
Details2018-09-22 21:40-21:45 UT
Bright moonlight
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraAtik 460EX, Baader 7nm Ha filter
Exposure(s)2 x 300s
darks, flats
CaptureAPT
ProcessingNebulosity 4, Photoshop
23 September 2018|Caldwell, Nebula, News, NGC Autumn|

NGC 752

Heavy processing to remove moonlight background. First entry in the SAA 100 catalog.

Object IDNGC 752
Open Cluster, Andromeda
Mag. 5.7, size 50′
Details2018-09-21
Bright 90% Moon
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraCanon 600D
Exposure(s)10x40s, ISO 800, darks, flats
CaptureAPT
ProcessingNebulosity, Photoshop
22 September 2018|News, NGC Autumn, Open Cluster|