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NGC 281 (Pacman nebula) in RGB
Few things wrong. Poor seeing, bloated stars, gusty wind,…
| Object ID | NGC 281 Pacman nebula (IC11) Mag. 10, Size 35′ H II region emission nebula Contains open cluster NGC 1590 Cassiopeia |
| Details | 2018-10-10 Poor seeing and transparency |
| Telescope | 200mm f5 Newtonian, MPCC IDAS P2 LPR filter Guided |
| Camera | Atik 460EX, Baader RGB filters |
| Exposure(s) | 15 x 120s each colour darks, flats |
| Capture | APT |
| Processing | Nebulosity 4, Photoshop |
NGC 281 (Pacman nebula) in Ha
Best night for ages.
| Object ID | NGC 281 Pacman nebula (IC11) Mag. 10, Size 35′ H II region emission nebula Contains open cluster NGC 1590 Cassiopeia |
| Details | 2018-10-06 22:03-23:41 UT No moonlight and good transparency |
| Telescope | 200mm f5 Newtonian, MPCC IDAS P2 LPR filter Guided |
| Camera | Atik 460EX, Baader 7nm Ha filter |
| Exposure(s) | 19 x 300s darks, flats |
| Capture | APT |
| Processing | Nebulosity 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
Bubble nebula project 2 (NGC 7635)
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.
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 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 |
NGC 752
Heavy processing to remove moonlight background. First entry in the SAA 100 catalog.
| Object ID | NGC 752 Open Cluster, Andromeda Mag. 5.7, size 50′ |
| Details | 2018-09-21 Bright 90% Moon |
| Telescope | 200mm f5 Newtonian, MPCC IDAS P2 LPR filter Guided |
| Camera | Canon 600D |
| Exposure(s) | 10x40s, ISO 800, darks, flats |
| Capture | APT |
| Processing | Nebulosity, Photoshop |
NGC 281 (Pacman nebula)
Nebula, Star Cluster, Open Cluster, HII Region, Cassiopeia
Mag. 7, Size 48′
2015-10-02
200mm f8 RC, piggyback guiding C80ED
L 10×300 2×2, RGB 10×240 3×3
BPM, flats
Atik 460EX (-10C), LRGB filters, IDAS P2 LPR filter
Captured in APT, Processed in Nebulosity3, PS CC, LightRoom
Very bad focus and some field rotation.