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Medusa nebula image

 

This is an image of the Medusa nebula (Abell 21), a large, dim planetary nebula in Gemini. It wasn't discovered until 1955 and was thought to be a supernova remnant because of its visual structure.? But measurement of its expansion rate in the mid-70s caused it to be reclassified as an old planetary nebula.? The progenitor star is the bright blue dot slightly right of center, glowing brightly in blue and ultra-violet as it passes through a helium burning phase on its way to becoming a white dwarf star.? I originally imaged this target in 2017 but didn't get enough data to avoid an overly noisy result. So this version is a mash-up of that original data combined with new data from both 2023 and 2024 in New Mexico, all using the same setup - a 12.5" PlaneWave scope and a QSI-640ws camera at f/8.? The total time spent on the target was 32.6 hours using LRGB, Ha, and Oiii filters.



Thanks for looking,
Bruce W.
 

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Bruce,
That¡¯s very nice indeed.

Geof

Sent from

From: [email protected] <[email protected]> on behalf of bw <bw_msg01@...>
Sent: Monday, February 26, 2024 7:13:50 PM
To: [email protected] <[email protected]>
Subject: [QSI-CCD] Medusa nebula image
?
This is an image of the Medusa nebula (Abell 21), a large, dim planetary nebula in Gemini. It wasn't discovered until 1955 and was thought to be a supernova remnant because of its visual structure.? But measurement of its expansion rate in the mid-70s caused it to be reclassified as an old planetary nebula.? The progenitor star is the bright blue dot slightly right of center, glowing brightly in blue and ultra-violet as it passes through a helium burning phase on its way to becoming a white dwarf star.? I originally imaged this target in 2017 but didn't get enough data to avoid an overly noisy result. So this version is a mash-up of that original data combined with new data from both 2023 and 2024 in New Mexico, all using the same setup - a 12.5" PlaneWave scope and a QSI-640ws camera at f/8.? The total time spent on the target was 32.6 hours using LRGB, Ha, and Oiii filters.



Thanks for looking,
Bruce W.

 

A beautiful image Bruce!

Clear skies,
Kevin


From: "bw msg01" <bw_msg01@...>
To: "QSI-CCD" <[email protected]>
Sent: Monday, February 26, 2024 2:13:50 PM
Subject: [QSI-CCD] Medusa nebula image

This is an image of the Medusa nebula (Abell 21), a large, dim planetary nebula in Gemini. It wasn't discovered until 1955 and was thought to be a supernova remnant because of its visual structure.? But measurement of its expansion rate in the mid-70s caused it to be reclassified as an old planetary nebula.? The progenitor star is the bright blue dot slightly right of center, glowing brightly in blue and ultra-violet as it passes through a helium burning phase on its way to becoming a white dwarf star.? I originally imaged this target in 2017 but didn't get enough data to avoid an overly noisy result. So this version is a mash-up of that original data combined with new data from both 2023 and 2024 in New Mexico, all using the same setup - a 12.5" PlaneWave scope and a QSI-640ws camera at f/8.? The total time spent on the target was 32.6 hours using LRGB, Ha, and Oiii filters.



Thanks for looking,
Bruce W.

 

Geof & Kevin, thanks for the feedback.

Bruce
 

Any idea why when I click on the link I get an Http 500 error -?

This page isn¡¯t working right now

?can't currently handle this request.

I tried yesterday and today and I get the same message.

Manning B
 

Some of you may have been unable to link to my website because it had been stepped on by the hosting service. :-(? I have now restored it so image links should work again.

Regards,
Bruce W.

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