NGC 7217 - A galaxy in Pegasus (Daniel.P)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7217

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NGC 7217 - A galaxy in Pegasus

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NGC 7217 - A galaxy in Pegasus

FWHM measured in PI : 2.1 arcsec (Moffat 4) : the seeing was quite good on average, ranging between 3.0 to 1.6 arcsec on sub exposures

Equipment used :

first night : AO with OAG

2nd & 3rd nights : AO + ONAG (on axis guiding)

With the ONAG, the 133 mm back focus was not achieved (+/- 170 mm) ; slight increase in FWHM on the external part of the image can be detected. I am working on achieving exact BF.

I will publish map of FWHM with unadjusted BF for information.

The combination of AO & ONAG is very effective and easy to use. I still have some trouble tuning the "bump" parameter in PHD, but OK overall.

Pre-processing done in Pixinsight :

- overscan area offset correction

- bias correction

- dark correction using 7 x 1800 s darks

- flat correction

- hot pixel correction

- debayer

- registration

- stack

- crop

Processing done in Pixinsight :

- backgroung color neutralisation

- color calibration using galaxy

- sky background removal (DBE in PI)

- slight deconvolution

- non linear image creation

- TGV denoise (no mask)

- color saturation boost masked

- green neutral

Final image :

- jpeg calibration done in Mac Photo (levels adjust and further saturation boost and color balance)

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	1245495
PixInsight job	MYTB91CD7VBVNNL3QUIDUHIZPUGRECG6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h07m50s.285
RA (top/left)	22h09m11s.736
RA (top/right)	22h06m24s.604
RA (bottom/right)	22h06m29s.185
RA (bottom/left)	22h09m15s.622

Dec (center)	+31°21′10″.82
Dec (top/left)	+31°33′37″.12
Dec (top/right)	+31°32′14″.48
Dec (bottom/right)	+31°08′41″.27
Dec (bottom/left)	+31°10′03″.80

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NGC 7217 - A galaxy in Pegasus

NGC 7217 - A galaxy in Pegasus

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NGC 7217 - A galaxy in Pegasus

NGC 7217 - A galaxy in Pegasus

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