Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration (Ian Parr)

Celestial hemisphere: Southern · Constellation: Eridanus (Eri) · Contains: NGC 1365 · NGC 1379 · NGC 1381 · NGC 1386 · NGC 1387 · NGC 1389

Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration, Ian Parr

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Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

Powered byPixInsight

Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

This a field of galaxies in Fornax which includes NGC 1365 and offset to include elements of Markarian's Chain, imaged in Narrow Band.
NGC 1365 is a barred spiral galaxy in the Fornax cluster about 52 Million Light Years away and a diameter of about 205 000 light-years with an Apparent magnitude of 10.3 and an apparent size of 11.2 × 6′.2 arc minutes. It contains a central supermassive black hole in the active nucleus, which has a mass of about 2 million solar masses, rotates at close to the speed of light!

I wanted to see exactly how much SII would add to my earlier Bi-colour HA OIII effort, so I put last nights' good seeing to getting some SII and a bit more HA and OIII, the better to wield the sub-frame selector knife with and dump Elon's infernal Starlink satellites. BTW, if they go from 3000 to over 30,000 without severely limiting their brightness the discard pile with be 100% instead of the current 5-10% and I can sell my gear and do something else.Hartmut V. Bornemann's SKILL script can only do so much and Photoshop could do it but that would be last resort. Hopefully someone create a version of SKILL that uses artful cloning instead of obliteration leaving a black line instead of a white line across the image.

So my earlier assertion that SII is mostly a waste of time on a galaxy field like this now stands corrected. Pixinsight SpectophotoMetricColorCalibration tool appears to get the SII wavelength wrong by default so once I replaced 500.70 with 671.60 it worked much better. That said it is a complex tool and like most of Pixinsight, it’s a learning curve on a winding mountain road.

So I am much happier now that moon blasted clear nights can be put to good use on galaxies too.

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Status	Basic success
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Astrometry.net job	6731129
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Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

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Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

Fornax Galaxy Field with NGC 1365 in Narrow Band with SII and Corrected SpectoPhotoMetricColor NB Calibration

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