Nighthawk 100nm Image of Omega Centauri (Rod Kennedy)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: NGC 5139 · omega Cen

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Nighthawk 100nm Image of Omega Centauri

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Nighthawk 100nm Image of Omega Centauri

Green filter on a OSC camera using a 16 year old achromat refractor with no guiding. Crazy?

This image started out as a post polar alignment test of my second telescope mount.

The refractor is a classic Stellarvue 80mm F-6 Doublet Achromat (AT1010NB), the "Nighthawk", that I bought new direct from Stellarvue on a visit to the US in 2003. Being an achromat it shows some purple fringing on bright objects and a bit of coma (field is not quite flat). For visual work these shortcomings are barely noticeable. But it's a telescope that I'll never sell.

For coma, the one-shot ASI183MC Pro cooled CMOS camera not having a big sensor (13.2 x 8.8 mm but still 5496 x 3672 pixels) relaxes the off-axis optical performance of any telescope (of course if you look for coma you can still find it).

To deal with fringing, didn't want to push my luck so I used a spare G filter (G as in LRGB broadband) to "restrict" the bandwidth to ~100nm but still get plenty of broadband signal (that is, Bayer RGGB -> *GG* where * means filtered out) to get the monochrome result.

There was no guiding but I had just polar aligned my Skywatcher HEQ5 Pro mount with the PhD2 Drift Align Tool. So 30 second exposures were used and stacked.

This capture goes against many recommended techniques but new life has been give to a truely venerable telescope.

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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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	2786115
PixInsight job	W4I4ZZW345TK267UGXKY1SVKC8V5ZYD2
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h26m48s.480
RA (top/left)	13h24m24s.588
RA (top/right)	13h24m25s.290
RA (bottom/right)	13h29m14s.938
RA (bottom/left)	13h29m07s.756

Dec (center)	-47°28′33″.22
Dec (top/left)	-46°53′00″.40
Dec (top/right)	-48°04′24″.13
Dec (bottom/right)	-48°03′55″.48
Dec (bottom/left)	-46°52′32″.83

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Nighthawk 100nm Image of Omega Centauri

Nighthawk 100nm Image of Omega Centauri

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Image Index:

Contribution Index (beta):

Nighthawk 100nm Image of Omega Centauri

Nighthawk 100nm Image of Omega Centauri

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Description

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