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Jan S Rek, Ravenshead, UK


IC410 emission nebula and NGC 1893 embedded open cluster. Iridescent gas columns at the lower centre are nicknamed "The Tadpoles".

A faint, dusty rose of the northern sky, emission nebula IC 410 lies about 12,000 light-years away in the constellation of Auriga. It lies approx 5.4° west of the mag 2.7 star Iota Aurigae. In this image North is at the 8 o'clock position.

The cloud of glowing hydrogen gas is over 100 light-years across, sculpted by stellar winds and radiation from the embedded open star cluster NGC 1893. Formed in the interstellar cloud only about 4 million years ago, bright cluster stars are seen just below the prominent foreground dark dust cloud near picture center. Notable near the 6 o'clock position in this wide, detailed view are two relatively dense streamers of material trailing away from the nebula's central regions. Potentially sites of ongoing star formation, these cosmic tadpole shapes are about 10 light-years long.

Officina Stellare RC400 at 3278mm focal length, F8.2.
Paramount ME German equatorial Mount.
Camera SBIG ST-11000M with FW-8L filter wheel.
AstroDon MMOAG with SBIG Remote Guide Head.
Optec Pyxis 3" Rotator.
TheSky V6 telescope control.
ScopeDome remote observatory.

Remote session using RADMIN PC control from Ravenshead, UK.
Exposures:- 320:400:420 mins total using 20 min Ha, SII and OIII, 100 mins each for RGB using 5 min subs.

Image acquisition and telescope control with CCDSoft V5. Remote acquisition sequence program CCDAutoPilot.
Data reduction, Synthetic Luminance (Ha+SII+OIII) de-convolution and master RGB colour image prepared with CCDStack.
Narrowband combination and blending created and finished with Photoshop CS6. Final RGB image created using PhotoShop CS6.

    • Double nut cluster and daveco like this

    Great detail and abviously good tracking.  I really like the color.  Well done!


    Thanks for your opinion Robert. I only recently acquired an MMOAG after fitting a secondary focuser to the scope. I did it to enable me to remove the FTF3545 back-end focuser which released 104 mm of back-focus. This at last allowed me to image narrowband with the guider in front of the filters.
    This is actually only my second ever full NB image which also happens to be the first time I have blended RGB with the NB for the expansion of the color palette options, not just for the RGB stars. Its great fun doing the blending this way but it takes for ever to decide which final blend to use. Glad you liked the one I chose.
    You did touch on a tricky subject - guiding. I am not too happy about the guiding I m getting. I suspect my mount has a vibration harmonic when there is any wind above 5 mph, but I can t be sure. I mitigate the issue by taking many images, stacking in CCDStack and using rejection algorithms which is not optimal but it helps.
    - Jan