Hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  12.33  ·  125 Tau  ·  136 Tau  ·  203 Pompeja  ·  26 Aur  ·  PK178-02.1  ·  PK181+00.1  ·  Sh2-240  ·  Sh2-242  ·  The star 125Tau  ·  The star 136Tau  ·  The star 26Aur
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SH2-240 Samyang f2.8, 


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SH2-240 Samyang f2.8

Technical card

Imaging telescopes or lenses: Samyang 135mm f/2

Imaging cameras: ZWO ASI071MC PRO CMOS OSC

Mounts: Orion Azeq Atlas pro

Guiding telescopes or lenses: ASTRO TECH AT66ED Guiding

Guiding cameras: Orion Starshoot Autoguider

Software: PixInsight  ·  Stark Labs pHD guiding PHD2  ·  EQMOD, Stellarium, Stellarium Scope, PHD, Backyard EOS, Astro Tortilla Nebulosity 4

Filters: Optolong L-eNhance 2"  ·  Optolong L-eXtreme 2"  ·  Zwo Filter Drawer

Accessory: Thousand Oaks Dew Controller

Dates:Nov. 23, 2020Nov. 24, 2020Nov. 25, 2020Dec. 4, 2020Dec. 6, 2020

Optolong L-eNhance 2": 63x300" (gain: 90.00) -10C
Optolong L-eXtreme 2": 110x600" (gain: 90.00) -10C
Optolong UV-IR: 70x30" (gain: 90.00) -10C

Integration: 24.2 hours

Darks: ~30

Flats: ~30

Bias: ~50

Avg. Moon age: 13.53 days

Avg. Moon phase: 72.90%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 18.48

Astrometry.net job: 4070354

RA center: 5h 41' 51"

DEC center: +27° 55' 15"

Pixel scale: 3.794 arcsec/pixel

Orientation: -106.366 degrees

Field radius: 3.823 degrees

Resolution: 5142x5125

Locations: Home backyard red turning white zone Bortle 8, Gilbert, Az, United States

Data source: Backyard


SH2-240 is a supernova remnant in Taurus. This turned out to be one of the most difficult objects to process for me. Although I aquired over 23 hours of data using the L-xtreme filter, it wasn't enough, probably because of my Bortle 7-8 skies. I know it is noisy and could use twice the amount of data. But I want to move on to other targets. Mainly galaxies using one of my other scopes. So for now I will have to settle with what I have and maybe capture this target another time from my Bortle 4 site. Clear skies! Mike