AR2733 Rounding the Limb at 150mm in 6562.8A & 395nm (UV-A) | Jan 29th 2019

[MalVeauX]

Heya,

I woke up to pleasantly decent seeing and clear skies this morning. I started imaging AR2733 as it was rounding the limb around 9:30am with the sun at 23 degrees approximately. I imaged both in 656.28nm & 395nm (white light, UV continuum A) to see the difference at this wonderful angle on the limb with a 150mm aperture.

B&W:

Colored:

Equipment:

HA:
Celestron 150mm F8 Refractor
Daystar 150mm ERF
Daystar Quark Chromosphere + PST Etalon
ASI174MM + 0.5x Focal Reducer

WL:
150mm F8 Refractor
3x Barlow (F24)
Baader 2" Blue CCD IR-block filter (ERF)
395nm Filter (UV-A)
ASI174MM

Very best,

[Sunshine]

Amazing images as usual, i'm curious, you're using a Quark plus a PST etalon, i'm guessing the PST etalon makes it a double stack? otherwise with just a Quark it wouldn't be correct?

[Mark at Beaufort]

What incredible images - really enjoyed viewing your work especially as I had viewed AR2733 a few days ago.

[David Smith]

Another super set Marty.

[Rainer]

Hi Marty,

Great images and nice to see you here.

greetings from Mexico

Rainer

[Davey-T]

Great set, amazing detail, you're setting the bar high, Sun is around -17 degrees here 

Dave

[xtreemchaos]

lovely shots, cracking detail. charl.

[MalVeauX]

Thanks all, ?

4 hours ago, Sunshine said:

 i'm curious, you're using a Quark plus a PST etalon, i'm guessing the PST etalon makes it a double stack? otherwise with just a Quark it wouldn't be correct?

Yes, I've been experimenting with using my Quark (first in the train) followed by a PST etalon (with the collimating lenses removed, so just the bare etalon). The challenge is tuning them both to the same frequency. The PST etalon narrows the skirt of the transmission profile that helps remove the double limb and other continuum leaking sources. So in effect it is a double stack. It's not perfect, but it is working and didn't require super expensive equipment.

Very best,

[Pete Presland]

Superb set of images.