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A very quick Ha look at the big prom on 21 March

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#1 Foc

Foc

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Posted 21 March 2025 - 08:59 PM

21 March DS80 Lunt 1.6x Antares barlow ZWO 533mm,  First image 0208 UT, later images 0317-UT

 

After seeing Groom's callout on a flare and others saying they might be clouded out all day, I started looking for a break in the heavy grey clouds above Canberra. Had a very brief opening and, naturally, this was at meridian and the scope was not tracking. Only time for one quick drifting capture attempt before clouds again closed over.  Result was a blurry whole disc image which I savagely cropped to a square just around the big prom and have posted it first.

 

That looked like it.  But then 25 minutes before I had to catch the bus for the school pick up, I could see that the cloud front was eventually going clear the sun,,,but would it do so in time??

 

Down to about 10 minutes to go, seems to be virtually cleared.  Fire up the laptop, but no image on firecapture even with gain turn up...oh forgot I had put the cap on the end in case of rain.   D*mn (large body of water)!!, And after sitting outside for hours since the last attempt, tuning was well and truly out. Not much time left at all, do a quick hasty tune and rushed capture (stuffed up the FOV a bit cutting into the prom).  Well I've got something, now quick pack up and catch that bus!

 

 

 

Attached Thumbnails

  • 2025-03-21-0208_0-U-Ha-Sun_Halpha_drifting with area in AS4 used ZWO ASI533MM_Gain=306_lapl3_ap1582_WS.jpg
  • 2025-03-21-0315_2-U-Ha-Sun_Halpha_ZWO ASI533MM_Gain=324_limit000001-000650 whole disc less clouds_Antares barlow reduced to 60pc lapl3_ap2038_WS.jpg
  • 2025-03-21-0317_5-U-Ha-Sun_Halpha_Sector prom a bit cut offZWO ASI533MM_Gain=369_lapl3_ap278_WS.jpg

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#2 rigel123

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Posted 21 March 2025 - 09:07 PM

Nice catch, glad you made the bus in time!


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