All the material on this website is copyrighted to J-P Metsavainio, if not otherwise stated. Any content on this website may not be reproduced without the author’s permission.

Have a visit in my portfolio

Sunday, February 9, 2020

New photo of Cederblad 214, the Cosmic Question mark

So far this has been the most cloudy winter up here for twenty years. I'm trying to use every single clear moment to have something to publish. beside the weather problems, the light pollution is increasing every moment due to LED-lightning. We have now more light pollution than ever and it's Broadband, multi spectral light. Old high pressure sodium and mercury lights are easy to filter out since the light from them is yellowish narrowband emission. LED light is impossible to filter out, it's like a Sunlight, very broad band from IR to UV and everything between. Imaging is getting more difficult and soon it'll be impossible from my current location.

This photo was taken with my "new" imaging system. I managed to mate an old Tokina AT-x 300mm f2.8 camera optics with the Apogee Alta U16 astro camera and filter wheel. Some angle grinder was needed to have enough back focus... More info here,

This new photo of Cosmic Question Mark has a great symbolic value for me. The cosmic curiosity is the very reason I'm doing this difficult, and sometimes frustrating, form of nature photographing. 

Cederblad 214 and Sharpless 170,  ? "
Please, click for a full size image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen. 

Closeup from the center (An older, long focal length image)
Please, click for a full size image

A detail shot from the bright central region of the image at the top.  This photo was taken with my new setup, Celestron Edge HD 1100 f7, Apogee Alta U16 astro camera and the Astrodon narrowband filters, Spring 2014. The original blog post from 2012, with technical details, can be seen HERE


This cosmic question mark, in constellation Cepheus, contains following objects; At top, Cederblad 214(Ced 214) surrounded by NGC 7822, a dot like nebula at the bottom is known as Sharpless 170,(Sh2-170). Image spans over Five degrees vertically. Distance from my observatory, is ~2750 light years and it spans about 40 light years.

Orientation in the sky

Cederblad 214 can  be seen at upper left corner. Image shows its location related to constellation Cepheus.

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Tokina AT-x f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200

Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time

H-alpha, 12 x 1200 s, binned 1x1 = 4 h
O-III, 1x 1200 s, binned 2x2 = 20 min.
S-II, 1 x 1200 s. binned 2x2 = 20 min.

No comments: