![Bubble Nebula, M52 Open Cluster and Molecular Cloud in Cassiopeia [Uncropped] | by john.purvis](http://live.staticflickr.com/65535/54238390074_ed55f125bc.jpg)
Bubble Nebula, M52 Open Cluster and Molecular Cloud in Cassiopeia [Uncropped]
Uncropped image from a 480mm scope. The chief targets were M52 and the Bubble Nebula but you can see several dark nebulae and the red glow of a molecular cloud towards the right.
www.flickr.com/photos/16271433@N02/15093428895/in/album-7...
An interesting circular feature inside an emission nebula.
The bright star at 2 O'clock inside the bubble is a O6.5 class giant that has shrugged off clouds of hydrogen gas as it matures.
The diffuse red cloud represents earlier ejections whilst the "bubble" represents a more tightly defined and more recent ejection of matter. The O class star is rich in ultraviolet light (surface temp = 37500k compared with 5700k for our Sun) that makes the hydrogen gas fluoresce with its characteristic red colour (656 nm).
The host star (BD +60 2322) is not at the centre of the bubble but it is thought that it probably was when the bubble was ejected.
Equipment-
480/60mm f/6 Altair Astro Triplet Refractor.
Altair Astro planostar x 1.0 FF with 2 inch IDAS LPS D1 filter
ZWO ASI2600MC; 30 x 5 minute subs + (150 minute total integration). Gain: 100 Offset:50 Temp: -10c.
NEQ6 Pro Mount with Rowan modified belt drives.
Laptop with SharpCap 4.0 for plate solving GOTO. focusing and acquisition.
Calibration-
50 dark frames
50 flat frames (Electroluminescent panel @ 1 second, Gain 0)
QHY Polemaster alignment -
Error measured by PHD2 =1.2’
Guiding-
PHD2 guiding with ZWO ASI290mm/Altair lightwave 209/50mm secondary scope. Alternate subs dithered.
RA 0.53” RMS
Dec 0.35” RMS
Astrometry-
Resolution ............... 1.613 arcsec/px
Focal distance ........... 479.46 mm
Pixel size ............... 3.75 um
Field of view ............ 31' 59.8" x 25' 6.8"
Center (RA, hms): 12 36 08.136
Center (Dec, dms): +25 55 58.99
Light Pollution-
SQM (L): 20.33 mag/arcsec2.
Typical of outer suburbs - Bortle scale = 5/9 Yellow
Environmental-
Clear throughout
Post processed in PixInsight 1.8.9
Bubble Nebula, M52 Open Cluster and Molecular Cloud in Cassiopeia [Uncropped]
Uncropped image from a 480mm scope. The chief targets were M52 and the Bubble Nebula but you can see several dark nebulae and the red glow of a molecular cloud towards the right.
www.flickr.com/photos/16271433@N02/15093428895/in/album-7...
An interesting circular feature inside an emission nebula.
The bright star at 2 O'clock inside the bubble is a O6.5 class giant that has shrugged off clouds of hydrogen gas as it matures.
The diffuse red cloud represents earlier ejections whilst the "bubble" represents a more tightly defined and more recent ejection of matter. The O class star is rich in ultraviolet light (surface temp = 37500k compared with 5700k for our Sun) that makes the hydrogen gas fluoresce with its characteristic red colour (656 nm).
The host star (BD +60 2322) is not at the centre of the bubble but it is thought that it probably was when the bubble was ejected.
Equipment-
480/60mm f/6 Altair Astro Triplet Refractor.
Altair Astro planostar x 1.0 FF with 2 inch IDAS LPS D1 filter
ZWO ASI2600MC; 30 x 5 minute subs + (150 minute total integration). Gain: 100 Offset:50 Temp: -10c.
NEQ6 Pro Mount with Rowan modified belt drives.
Laptop with SharpCap 4.0 for plate solving GOTO. focusing and acquisition.
Calibration-
50 dark frames
50 flat frames (Electroluminescent panel @ 1 second, Gain 0)
QHY Polemaster alignment -
Error measured by PHD2 =1.2’
Guiding-
PHD2 guiding with ZWO ASI290mm/Altair lightwave 209/50mm secondary scope. Alternate subs dithered.
RA 0.53” RMS
Dec 0.35” RMS
Astrometry-
Resolution ............... 1.613 arcsec/px
Focal distance ........... 479.46 mm
Pixel size ............... 3.75 um
Field of view ............ 31' 59.8" x 25' 6.8"
Center (RA, hms): 12 36 08.136
Center (Dec, dms): +25 55 58.99
Light Pollution-
SQM (L): 20.33 mag/arcsec2.
Typical of outer suburbs - Bortle scale = 5/9 Yellow
Environmental-
Clear throughout
Post processed in PixInsight 1.8.9