new icn messageflickr-free-ic3d pan white
Sh2-235 in HSSrgb | by Carballada
Back to photostream

Sh2-235 in HSSrgb

www.astrobin.com/995c30/F/

Another object from this nice catalogue of faint nebula.

Long integration of 53 hours using two narrow band filters mainly, searching the limits of the equipment and my own process skills.

It's not a popular target probably because is difficult and usually is not showing so much detail due to the high dynamic range, the core is bright, really bright compare with the faint surroundings.

 

Sh2-235 is the most central and brightest nebula of an H II region known as G174+2.5; it is observed in the direction of the northern part of the Aur OB1 association and includes the nebulae catalogued as Sh2-231, Sh2-232, Sh2-233 and Sh2-235, identified as individual nebulae in the 1959 census of H II regions. Although in the optical images they appear as distinct nebulae, in reality they all belong to a single giant molecular cloud, of which some parts appear illuminated by young and hot stars. This cloud is located in Perseus' Arm at a galactic latitude that places it slightly off-center with respect to the center of the galactic disk; the distance measurements indicate a range between 1600 and 2000 parsec, so it is normally indicated as about 1800 parsec (5870 light years).

 

(descri. credits to wiki.it it.wikipedia.org/wiki/Sh2-235)

 

Technical card

Imaging telescope or lens:Altair Astro RC250-TT 10" RC Truss Tube

 

Imaging camera:ZWO ASI1600MM-Cool

 

Mounts:Mesu 200 Mk2, Astro-Physics Mach-1 GTO CP4

 

Guiding telescope or lens:Celestron OAG Deluxe

 

Guiding camera:ZWO ASI174 Mini

 

Focal reducer:Riccardi Reducer/Flattener 0.75x

 

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

 

Accessories:ZWO EFW, MoonLite NiteCrawler WR30

 

Resolution: 2328x1760

 

Dates:Dec. 25, 2019, Jan. 3, 2020, Jan. 12, 2020, Jan. 15, 2020

 

Frames:

Astrodon B Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Astrodon G Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Astrodon HA 36mm - 5nm: 186x600" (gain: 200.00) -20C bin 1x1

Astrodon R Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Optolong SII 6.5nm 36mm: 121x600" (gain: 113.00) -20C bin 1x1

 

Integration: 53.4 hours

 

Avg. Moon age: 18.25 days

 

Avg. Moon phase: 55.61%

 

Astrometry.net job: 3224550

 

RA center: 5h 41' 5"

 

DEC center: +35° 49' 58"

 

Pixel scale: 1.007 arcsec/pixel

 

Orientation: 90.283 degrees

 

Field radius: 0.408

 

Locations: AAS Montsec, Àger, Lleida, Spain

 

Data source: Own remote observatory

 

Remote source: Non-commercial independent facility

40,529 views
219 faves
6 comments
Uploaded on February 5, 2020