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Imaging Corona Borealis to catch the Blaze Star, reprise

March 19, 2025
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Imaging Corona Borealis to catch the Blaze Star, reprise
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Sky chart going through north on Saturday, March 22 as seen from Adelaide at 05:56 ACST (90 minutes earlier than dawn, 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 going through north on Saturday, March 22 as seen from Adelaide at 05:56 (90 minutes earlier than dawn, 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 right 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 displaying the magnitude of surrounding stars. The decimal factors have been omitted eg 22 is 2.2, 89 is 8.9

T Coronae borealis (T CrB) didn’t go Nova Final September as predicted. Nevertheless, Thuringian State Observatory noticed the emission lines in the spectrum of T CrB have risen sharply, indicating a tremendously elevated accretion fee, and probably an outburst is coming quickly. See additionally https://www.astronomerstelegram.org/?read=17041

Sadly, Corona Borealis is within the morning sky now, so it’s important to rise up at darkish o’clock to see it.

Should you look to the North within the morning at astronomical twilight (90 minutes earlier than dawn), you will notice a distinguished vivid orange star, Arcturus (see prime chart), for those who look downwards and to the precise you will notice 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 referred to as the blaze star. T CrB is a recurrent nova, a binary system the place gasoline from a pink big star accretes on a white dwarf companion. Ultimately the gasoline 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. Current patterns of brightening and dimming seem like the pre outburst part of the 1946 eruption. It was predicted that T CrB could go nova between August and the top of September 2024. That did not occur, however the brand new spectral modifications could herald the lengthy awaited outburts

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’ll solely stay above unaided eye visibility for per week or so. 

T CrB is positioned 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 vivid stars within the area, so when it erupts it is going to be simply seen.

The problem:  

Take a picture of Corona Borealis each clear morning throughout March-April awaiting the eruption. You’ll need a stack of ~ 10 photographs at excessive ISO of round 1 second period, then stacked in applicable software program to select up the faint stars. It might be greatest for those who zoomed in in order that Corona Borealis occupies many of the digital camera area (with a little bit of area on the right-hand aspect so that you don’t miss out on T CrB. That manner hopefully you’ll catch not solely the eruption, however the fade as properly, doing a little bit of backyard astrophysics. 

Be affected person, after just a few night time astrophotography you’ll turn out to be acquainted with the celebs and can simply see when T CrB erupts. 

You too can comply with the T CRB Nova Watch on Space weather (within the the righthand panel). At present magnitude 10.

Labels: astrophotography, citizen science, nova, T CrB

# posted by Ian Musgrave @ 6:12 pm



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