Vela SNR Two Panels +1 in 3nm N[II]

[avandonk]

Managed to get data for a second panel in 3nm N[II]. The forbidden transition N[II] needs bright blue stars to excite it from monatomic Nitrogen.

It looks like the the far larger and far further away SNR or Gum nebula behind the Vela SNR has very little N[II] and is mainly HA. The aim is to make a mosaic about 4X4 panels with N[II] as the red channel and OIII to green and blue. This will be blended with LRGB to get the star colours and dust. This will hopefully separate the Vela SNR from the confusing HA background.

Here is the two panel mosaic in 3nm N[II]. FoV 6.6 X 3.5 degrees. 7MB

http://d1355990.i49.quadrahosting.co...10/VSNR1&2.jpg


Exposures for both panels 5x16 minutes.


Bert

[Larryp (Laurie)]

That is spectacular, Bert!

[avandonk]

Thank you Larry, here is an inverted version 7MB

http://d1355990.i49.quadrahosting.co.../VSNR1&2In.jpg


Bert

[Larryp (Laurie)]

Again, spectacular Bert!

[strongmanmike (Michael)]

Awesome! Look at all that emission...what a great age of imaging we are in

Mike

[avandonk]

Ever since I was a young lad Mike I wanted to image forbidden emissions!

To be serious I want to image very dim stuff in some sort of rational way that could be useful to other imagers with far longer focal lengths and higher resolutions.

The really nice thing I can get almost decent data with a full Moon imaging with 3nm filters. You can see the overlap between the two panels as I left a one pixel edge to delineate the two panels. The Full Moon even messes slightly with 3nm NB filters after about eight minute exposures.


Bert

[multiweb (Marc)]

Very cool. That's a great field. Very sharp details.

[MortonH]

Wonderful image.

What's a forbidden emission?

[avandonk]

Originally Posted by MortonH

Wonderful image.

What's a forbidden emission?

When an electron is raised to a higher energy level it emits a photon when it drops back towards the nucleus of the atom.

On Earth Nitrogen only exists as a molecule of N2. In the vast reaches of outer space the single Nitrogen atoms never or very rarely collide with another single Nitrogen atom to form a molecule of N2 or do not have enough electrons to have a party. So this lonely Nitrogen atom only interacts with the odd electron to emit so called 'forbidden' frequencies of light.

It is purely an historical term. The square brackets around the emission line [II] designate that the emission is forbidden. The prefix is the atom that is emitting ie N[II].

Bert

[Stevec35 (Steve)]

Very impressive result Bert

Cheers

Steve

[RickS (Rick)]

Very nice, Bert. That's a great project. I'm looking forward to the final result!

[Ross G]

Amazing detail Bert.

Ross.

[avandonk]

After dodging cloud managed to get another panel.

Three panels 7.5 MB


http://d1355990.i49.quadrahosting.co...0/3P_VSNR_.jpg


Inverted version


http://d1355990.i49.quadrahosting.co...3P_VSNR_In.jpg





Bert

[avandonk]

One way of getting large mosaics rectilinear is to use a program such as Stellarium which actually does produce rectilinear projections of the sky.

Starry Night Pro and Star Atlas Pro also do this.

Then use Registar to match the projection.

Bert

[Ric]

A wonderful image Bert

I'm enjoying watching it grow with each panel.

Cheers