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Saturday, August 4, 2012

Sh2-132 Nebula in HST palette

Sharpless 2-132 is a very faint emission type nebula on the Cepheus/Lacerta border. It lies at a degree southeast of Epsilon Cep, and has a size of about 40 arc minutes. The large but dim emission nebula Sh 2-132 in Cepheus lies 10,370 light-years away and spans another 272 light-years across.

The star at the center of the image below is the very luminous SAO 34301 (HD 211853, mag 8.99), perhaps more commonly known as WR 153, which along with another O-type star (mag 8.5) are primarily responsible for the excitation and ionization of the hydrogen gas in the area and which represents a relatively rare example of a Wolf-Rayet nebula.

Telescope: APM Astrograph 107, f/6.5 with Baader Steeltrack Focuser and 2.5'' TS FF
Mount: NEQ6 Pro with EQ Mod and XBOX Wireless Controller
Camera: ATIK 314L+
Image Scale: 1.91 arcsec/pixel
Filter: Baader Ha 7nm, OIII 8.5nm, SII 8nm, IDAS LPS
Filter Wheel: Starlight Xpress Motor USB, 7x1.25''
Guide Camera: QHY5 with PHD Guiding and TS UV/IR Block
Guide Scope: Skywatcher Finderscope 8x50
Total Exp. Time: 3 hours & 52 min (Ha: 120 mins Bin 1x1, O3, S2: 56, 56 min Bin 2x2)
Temperature: Ambient (25C), CCD (-5C)
Capture: Nebulosity 2
Register, Stack: Maxim DL, CCD Stack
Processing: Photoshop CS3
Date: 27 Aug 2011
Location: Tyros, Arcadia, GR

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