Sh2-238 (Hind's Variable Nebula) and Sh2-239 in a different light

[gorann]

These relatively often imaged objects are usually imaged in RGB. In fact I have not been able to find any narrow band images of this area. However, as the moon was out I decided to keep the NBZ dual band (Ha+Oiii) filter on, and hoped there would be a significant amount of Ha and Oiii emission in this area. To my surprise it picked up a lot of it, especially red (presumably Ha emitting) dust. It even picked up dust in areas where little or no dust is seen in RGB images, giving a rather different overall structure to these objects compared to what RGB images show. For example, this excellent IOTD by Jarrett Trezzo provides a striking comparison: https://www.astrobin.com/cmsh7t/E/.  Especially the dusty area in the central part of the image, catalogued by Lynds as LBN 819, is much larger in my NB image compared to RGB images.

Sh2-239 in the lower left, and Hind's Variable Nebula (aka NGC1444 or Sh2-238) in the upper right, both include Herbig-Haro objects. HH 102 respectively HH 155.

Imaged 5th December with my dual-RASA8 rig with ASI2600MC and IDAS NBZ filter. 96 x 5 min, so 8 hours. Processed in PI and PS with all the XT-tools.

Cheers, Göran

[tomato]

Lots of detail and nicely rendered colours, and beautifully framed.👍

And that’s a minor planet in the top left hand corner for good measure?

[gorann]

1 hour ago, tomato said:

Lots of detail and nicely rendered colours, and beautifully framed.👍

And that’s a minor planet in the top left hand corner for good measure?

Thanks a lot Steve! Sorry, but you lost me with the minor planet comment.....

[almcl]

I think it might be top right, 95 Arethusa, that Steve is referring to?

[gorann]

2 hours ago, tomato said:

Lots of detail and nicely rendered colours, and beautifully framed.👍

And that’s a minor planet in the top left hand corner for good measure?

 

24 minutes ago, almcl said:

I think it might be top right, 95 Arethusa, that Steve is referring to?

Great I got it now and that explains that odd looking band that I could not find in other images of the area. It was obviously moving during my 8 hours of exposure. Probably my first minor planet

[wimvb]

2 minutes ago, gorann said:

Probably my first minor planet

Wasn't RASA developed for sky surveys of minor planets and other "fast moving"  bodies that might come close to Earth? If so, you finally use the scope as intended. 😁

Great and surprising image, Göran.

[gorann]

24 minutes ago, wimvb said:

Wasn't RASA developed for sky surveys of minor planets and other "fast moving"  bodies that might come close to Earth? If so, you finally use the scope as intended. 😁

Great and surprising image, Göran.

Thanks and Yes, this was a surprise! Is minor planet the category below dwarf planet?

[tomato]

Sorry, don’t know my left from my right! I wasn’t familiar with the annotation label and discovered it was a minor planet.

I do recall reading somewhere that NASA or some other institution was using RASAs for a sky survey for potential collision candidates.

[wimvb]

14 hours ago, gorann said:

Thanks and Yes, this was a surprise! Is minor planet the category below dwarf planet?

Minor planets are asteroids and such, I think. I'm not sure about the exact differences, but I beleive that the distinction between planets / dwarf planets / minor planets is about size. The definition of a planet that I saw a long time ago was that a true planet has cleared its orbit of any other matter. Only larger bodies can do that. Asteroids / minor planets obviously haven't done so, or there wouldn't be an asteroid belt..

[gorann]

1 hour ago, wimvb said:

Minor planets are asteroids and such, I think. I'm not sure about the exact differences, but I beleive that the distinction between planets / dwarf planets / minor planets is about size. The definition of a planet that I saw a long time ago was that a true planet has cleared its orbit of any other matter. Only larger bodies can do that. Asteroids / minor planets obviously haven't done so, or there wouldn't be an asteroid belt..

Yes, I see that Wiki calls Arethusa "a large main belt asteroid", so obviously it has not cleared its orbit. So it is just a big asteroid.