Hydra Cluster (Abell 1060) (aikd)

Celestial hemisphere: Southern · Constellation: Hydra (Hya) · Contains: NGC 3307 · NGC 3308 · NGC 3309 · NGC 3311 · NGC 3312 · NGC 3314 · NGC 3316

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Hydra Cluster (Abell 1060)

Link to TIFF/FITS: http://sensoranalytics.com.au/astrobin/ngc3309.html

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Hydra Cluster (Abell 1060)

Link to TIFF/FITS: http://sensoranalytics.com.au/astrobin/ngc3309.html

Took Celestron OAG for a test-drive aimed at NGC3309 to see what got netted. Interesting bits fell way off the center, hence extra poor stars on some edges. To be honest half the time I didn't know what I was doing, PhD2 and EQMOD were bedding to new settings - 1.2m FL, ASI178MC OSC's tiny 2.4 µm pixels which required 4x4 binning to get to decent pixel-scale for guiding. Subs were showing considerable vignetting, clouds imminent. It seems Celestron have the OAG designed for their EdgeHD models in mind, long and the short I was constrained to increase backfocus to 126.85mm (>> C8's required 105mm) to get the guidecam parfocal to imaging cam. Doing so introduced strong vignetting near the OAG prism edge of the imaging sensor. Good news, flats and Siril's background extraction completely got rid of the vignetting, hence not a problem. As such case for the 240mm FL guide-scope replacement has been made. GS, may still be handy for light-polluted skies (so not giving it away). Offset 21, asymmetric crop, humidity a lot.

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Final
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B

Description: MT starfield reduction

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Status	Basic success
Started	...
Astrometry.net job	5593530
PixInsight job	n/a
PixInsight queue size	n/a
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Hydra Cluster (Abell 1060)

Hydra Cluster (Abell 1060)

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