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Lower’s nebula (Sh2-261) in Hα-SII/OIII/OIII+rgb

Posted on April 1, 2021April 21, 2021

www.astrobin.com/binq9s

Another nice object from the amazing Sharpless catalog.

Close to 80 hours of integration time and really surprised by the blue bubble that appears in the middle (not the bright blue triangle, the big blue subtle bubble on top of that) .

As usual on my latest pictures, I used this “natural” palette that I really like so much.

The process was long and hard and the acquisition also due to the weather in my observatory’s region.
This object was never something prioritari on my desk but I am really happy with the results, even with the hard work to process all this data.

Technical card
Imaging telescopes or lenses: Teleskop Service TS Photoline 107mm f/6.5 Super-Apo · Altair Astro RC250-TT 10″ RC Truss Tube

Imaging cameras: ZWO ASI183MM-Cool · ZWO ASI1600MM-Cool

Mounts: Skywatcher EQ6R Pro · Mesu 200 Mk2

Guiding telescopes or lenses: Celestron OAG Deluxe · Teleskop Service TSOAG9 Off-Axis Guider

Guiding cameras: ZWO ASI290 Mini · ZWO ASI174 Mini

Focal reducers: Riccardi Reducer/Flattener 0.75x · Telescope-Service TS 2″ Flattener

Software: Pleiades Astrophoto PixInsight · Seqence Generator Pro

Filters: Astrodon O-III 36mm – 5nm · Astrodon S-II 36mm – 5nm · Astrodon R Gen.2 E-series 36mm · Astrodon G Gen.2 E-series 36mm · Astrodon B Gen.2 E-series 36mm · Astrodon HA 36mm – 5nm · Astrodon L Gen.2 E-series 36mm

Accessory: ZWO EFW · Pegasus Astro Falcon Rotator · Pegasus Astro Ultimate Powerbox v2 · Astrolink 4.0 mini · MoonLite NiteCrawler WR30 · TALON6 R.O.R · MoonLite CSL 2.5″ Focuser with High Res Stepper Motor

Dates:Dec. 17, 2020 , Jan. 6, 2021 , Jan. 18, 2021 , Jan. 27, 2021 , Feb. 10, 2021 , Feb. 11, 2021

Frames:
Astrodon B Gen.2 E-series 36mm: 140×30″ (gain: 75.00) -20C bin 1×1
Astrodon G Gen.2 E-series 36mm: 140×30″ (gain: 75.00) -20C bin 1×1
Astrodon HA 36mm – 5nm: 240×600″ (gain: 200.00) -20C bin 1×1
Astrodon O-III 36mm – 5nm: 107×600″ (gain: 111.00) -15C bin 1×1
Astrodon R Gen.2 E-series 36mm: 140×30″ (gain: 75.00) -20C bin 1×1
Astrodon S-II 36mm – 5nm: 107×600″ (gain: 111.00) -15C bin 1×1

Integration: 79.2 hours

Avg. Moon age: 16.91 days

Avg. Moon phase: 31.21%

Astrometry.net job: 4352477

RA center: 6h 8′ 57″

DEC center: +15° 45′ 27″

Pixel scale: 1.007 arcsec/pixel

Orientation: 0.172 degrees

Field radius: 0.408 degrees

via Flickr https://flic.kr/p/2kJk48c

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