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Ian’s Astrophotography problem, imaging Corona Borealis to catch the Blaze Star

August 15, 2024
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Ian’s Astrophotography problem, imaging Corona Borealis to catch the Blaze Star
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Sky chart dealing with north on Saturday, August 17 as seen from Adelaide at 19:11 ACST (90 minutes
after sundown, click on to embiggen). The situation of T CrB is proven with a circle. Related views will likely be seen 90 minutes after Sundown elsewhere in Australia.
Sky chart dealing with north on Saturday, August 17 as seen from Adelaide at 19:11 ACST (90 minutes
after sundown, click on to embiggen). Constellation names and contours are proven for readability.
My picture of Corona Borealis taken on 10 August with my Samsung S24 in astrophography mode at 5x zoom. Stars all the way down to magnitude 7.5 are seen. The approximate location of T CrB is proven with a star above Ɛ CrB. AAVSO chart of Corona Borealis exhibiting the magnitude of surrounding stars. The decimal factors have been omitted eg 22 is 2.2, 89 is 8.9

In the event you look to the North at astronomical twilight (90 minutes after sundown), you will note a outstanding shiny orange star, Arcturus (see prime chart), if you happen to look downwards and to the precise you will note a dainty circlet of stars. Corona Borealis, the northern crown.

Whereas fairly in its personal proper, it homes a most uncommon star, T Coronae borealis (T CrB), also called the blaze star. T CrB is a recurrent nova, a binary system the place fuel from a crimson big star accretes on a white dwarf companion. Finally the fuel builds as much as a density the place a nuclear explosion happens and that is seen as  a nova. 

A recurrent nova is one the place there’s a (semi) common patter of repeated outbursts. T CrB appears to erupt each 80 years, with the final in 1946. Latest patterns of brightening and dimming appear like the pre outburst section of the 1946 eruption, and it’s predicted that T CrB could go nova between now and the tip of September this 12 months. 

When that occurs, T CrB will quickly rise to from its present magnitude 10 (properly beneath eye or binocular visibility)  round magnitude 2 about the identical brightness as Alphecca, 𝛂 Coronae Borealis (see backside left-hand panel), the brightest star within the constellation. It’s going to solely stay above unaided eye visibility for every week or so. 

T CrB is situated on the right-hand aspect to the circlet, simply above Ɛ CrB (see backside left-hand panel) the place the road of stars flip down, there are not any different shiny stars within the area, so when it erupts will probably be simply seen.

The problem:  

Take a picture of Corona Borealis each clear evening throughout Ausgust-September awaiting the eruption. You will have a stack of ~ 10 pictures at excessive ISO of round 1 second period, then stacked in acceptable software program to select up the faint stars. It might be greatest if you happen to zoomed in in order that Corona Borealis occupies a lot of the digicam area (with a little bit of house on the right-hand aspect so that you don’t miss out on T CrB. That approach hopefully you’ll catch not solely the eruption, however the fade as properly, doing a little bit of backyard astrophysics. 

Be affected person, after a couple of evening astrophotography you’ll turn out to be accustomed to the celebrities and can simply see when T CrB erupts. 

You may also observe the T CRB Nova watch on Space weather (within the the righthand panel). At the moment magnitude 19.

Labels: astrophotography, citizen science, nova, T CrB

# posted by Ian Musgrave @ 9:44 pm



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Tags: astrophotographyblazeBorealisCatchchallengeCoronaIansimagingStar
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