AR's 2806 & 2807 | HA CAK & WL | March 4th 2021

[MalVeauX]

Heya,

 

It rained yesterday but was clear this morning today, so I had a chance to look at AR's 2806 & 2807. They're small active regions, with tiny sunspot pores, no visible penumbra developed on either, but lots of lovely plage and filament activity between their poles. Took a look at them in HA, CaK & the Photosphere with a 100mm aperture. Seeing was not great, it was spiking 1.5 to 2 arc-seconds, so the HA is sampled well but the CaK is under-sampled.

The HA is higher contrast due to double stacking a custom 1.7A blocking filter (from Apollo Lasky) with a 6A blocking filter together in a Skybender, despite being a single stack etalon imaging train to get near double stack performance levels of contrast.

B&W:

 

 

 

 

 

 

 

 

 

 

 

Equipment:

 

100mm F10 Achromatic Doublet Refractor
+ Internal 50mm Baader Red CCD-IR Block Filter (D-ERF) + PST Etalon + Skybender with 1.7A BF & 6A BF Double Stacked + IMX290 (HA)
+ Internal 50mm Baader Red CCD-IR Block Filter (D-ERF) + Baader ND 3.0 Filter + IMX290 (Photosphere)
+ Internal 50mm Baader Blue CCD-IR Block Filter (D-ERF) + Lunt CaK B1200 Module + IMX290 (CaK)

 

Very best,

Edited March 5, 2021 by MalVeauX

[Stargazer33]

Really nice images. Great detail and focus.