Simeis 147 (Aleix Roig)

Simeis 147

Link to TIFF/FITS: https://flic.kr/p/2kSDfe7

Simeis 147, also catalogued as Sh2-240, is a supernova remnant that is found in the boundary of the constellations Taurus and Auriga covering an apparent diameter of approximately 3 degrees, the equivalent of 6 full moons. It is located approximately 3,000 light-years away from us and has an estimated age of 40,000 years. A massive star, in the last stages of its stellar life, exploted as a supernova leaving behind it a neutron star (pulsar PSR J0538+2817) and this amazing structure. The nebula evolves continuously giving to the scene a dynamic appearance that someone could remind of a spaghetti due to its intricate filaments of dust and gas.

Image details:

Ha: 96x300" (8h)

OIII: 54x300" (4,5h)

RGB: 15x120" (only for stars)

All images at 120 Gain -15ºC bin2

Calibrated with 50 flats, 50 darks and 50 bias

Total exposure: 14h

Image resolution: 2.12"/pixel

Average darkness: 20,85 mag/arcsec2

Equipment:

FSQ85ED telescope

Mesu200 mount

ASI294MM Pro camera with ZWO EFW 8 pos

Guiding with ASI174MC and ZWO OAG

Baader filters

Software:

SGP, PHD2, APP, PIX.

NOTE:

This image has been captured from my backyard observatory very late in this object's season (early April). I struggled to get enough data to capture this amazing, but really faint, supernova remnant. I focused on H-alpha data in order to get a good signal-to-noise ratio for the luminance master image. I also used the OIII filter to capture the even fainter emissions that can be detected in this nebula. I finally combined both the H-alpha and OIII data to create the luminance. The color has been composed following the HOO palette (H-alpha to R, OIII to G and OIII to B). RGB data has been used only for the stars.

Due to its great angular size, I could not fit all the nebula in one single image. This is a detail of the central part of Simeis 147.

Aleix Roig - Prades, Catalonia, Spain. April 2021.

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Status	Advanced success
Started	...
Astrometry.net job	4404623
PixInsight job	D2U6CK7TZVSYII2EL478FHDAZU78HGXR
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h41m45s.92
RA (top/left)	05h38m09s.52
RA (top/right)	05h37m57s.84
RA (bottom/right)	05h45m17s.50
RA (bottom/left)	05h45m39s.11

Dec (center)	+27°56′57″.8
Dec (top/left)	+29°09′45″.8
Dec (top/right)	+26°46′17″.8
Dec (bottom/right)	+26°43′48″.2
Dec (bottom/left)	+29°07′12″.7

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Simeis 147

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