Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  HD14  ·  HD223128  ·  HD223274  ·  HD223670  ·  HD224826  ·  HD224918  ·  HD225009  ·  HD225010  ·  HD225136  ·  HD225216  ·  HD225271  ·  HD225273  ·  HD404  ·  HD443  ·  HD553  ·  LBN 577  ·  LBN 580  ·  LBN 581  ·  LBN 582  ·  LBN 583  ·  LBN 584  ·  LBN 585  ·  LBN 586  ·  LBN 587  ·  LBN 588  ·  LBN 589  ·  LBN 590  ·  LDN 1260  ·  LDN 1263  ·  LDN 1264  ·  And 28 more.
Getting plate-solving status, please wait...
Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne
Powered byPixInsight

Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband

Revision title: Increased Reflection Component - Realizing the broadband blue component to this filter

Getting plate-solving status, please wait...
Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne
Powered byPixInsight

Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband

Revision title: Increased Reflection Component - Realizing the broadband blue component to this filter

Equipment

Loading...

Acquisition details

Loading...

Description

The Cosmic Question Mark (Ced 214 Region, Cassiopeia & Cepheus) - June,July 2023
Askar 500FRA telecope; iOptron HEM27 mount
ASI2600MC, Antlia Triband Ultra Filter (NB)
3 Panels (73,74,55 x 4800s exposures, Bin 1x1, Gain 100)
Total Integration Time = 26.9 hours
The Cosmic Question Mark in Cepheus stretches over 4 degrees of sky from top to bottom and straddles Greenwich Meridian of 0hrs RA. It is comprised of many identified emission nebula - most prominent are Ced 214 (aka NGC7822, the brightest emitter in the middle of the mark), Sh2-171 forming the top part of the mark, and Sh2-170 forming the dot - all of which are star forming regions. There are also a few star cluster here, the most notable being NGC 7762 within the upper right portion of the image, within the top part of the mark.
The entire question mark is not often imaged, as its component nebulae are fairly non-descript - with extremely little OIII or even blue colour, for that matter, other than in the stars themselves. The other reason is that it requires an extremely wide view or a mosaic to capture the entire object.
There are a couple of dark nebula bands thar run across the frame, the upper one clearly further along the path of fragmentation and collapse that will lead to more stars, than the one further down that remains quite diffuse.
Here I have employed a modified Forax palette, that I have also modified to tone down the bronze colour in favour of truer reddish tones.  One cool thing about the Antlia filter, is that it lets through a broadband blue component, which is great for imaging nebulae with a reflection component.   This is something missing from my dual band filter results and I initially overlooked when balancing my Forax palette.
I managed to impress myself by resolving an extremely small (at least with this field of view) double star (HD25009 & 25010), and finding a very populous, unrecognized cluster off of the nebulosity in the northeast corner of the frame.   I'll have to double check this cluster to see if it within any existing catalogues (it even looks somewhat globular).
If there is a sign to be had, I think it is "The Universe is Confused."

Comments

Revisions

  • Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne
    Original
  • Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne
    B
  • Final
    Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne
    C

B

Title: Colour Calibrated Version

Description: If one forces a spectrographic calibration of the stars (with this triband filter), and neutralize the background - a much more colourful (if less "realistic") version is obtained. I prefer the Forax one though.

Uploaded: ...

C

Title: Increased Reflection Component - Realizing the broadband blue component to this filter

Description: While processing, I forgot that this filter shows the broadband component of blue. I rarely post revisions, but my excuse is that I am just getting used to processing data from this filter. In the original, it was getting lost in the emission processing and my use of Forax.

Uploaded: ...

Sky plot

Sky plot

Histogram

Good Question - A 1x3 Mosaic at 0h RA in Cass/Cepheus in Narrowband, David Payne