Lmst

SciTech Chronicles. . . . .May 5th, 2025

#neurodegenerative #tau #misfolded #fibrils #nova #TCrB #Red #White #modular #Unitree #"B2 quadruped" #"extreme environment" #"water Cannon" #imaging #D-PSCAN #NTS #VNS #mtDNA #mutant #Disease #heteroplasmy

Regarding T CrB, the star behaves in the same manner as in recent months. So we have no real clue when its outburst will happen.
These are my most recent photometric observations of this recurrent nova star (Fig. 1).

I am complementing my observations with a comparison of the spectra with data from AAVSO’s observer PROI (Fig. 2).

The blue spectrum corresponds to when T CrB was close to its peak brightness at the end of March. The red spectrum was captured three days ago, when this star seemed less bright.

#Astrodon #Astronomy #TCrB #Science

The graph shown is called a light curve. It plots the changes in brightness of a star over time. Each point means an observation. The blue points are observations made with a blue photometric filter; the green points represent the observations made with a "visual" filter. By analyzing the shapes of the light curves, we can derive many properties of a particular star or star system.

Here's another "plot". This one is called a spectrum. It features two spectra, each one taken at a different time. Spectra show the energy a body emits at each wavelength of light. The idea is to compare how intense (how high) the peaks of the spectra are. This could give hints about the behavior of this star system known as T CrB.

Finally tracked down the overdue nova T Coronae Borealis by star hopping. It was gratifyingly unimpressive 😃

#tcoronaeborealis #tcrb #astronomy

Close up star chart showing T Coronae Borealis relative to Epsilon, the last night star in the constellation going clockwise

Star chart showing the way to T Coronae Borealis from Alphecca, the brightest star in the constellation

Heute, 27.3., ist der eine auf Basis der #Umlaufbahnen vom #Doppelgestirn berechnete Termin!
Seit Monaten erwarten #Astronomie Fans das mit bloßem Auge sichtbare Aufleuchten einer #Nova ✨im #Sternbild Corona Borealis
Wo ihr hingehauen müsst, um den "neuen Stern" zu sehen - gesetzt den Fall, der Weisse Zwerg wird zur #Nova und das Wetter passt - zeigt euch mein
- Video: https://youtu.be/NF4NWw2EuWM
- Info: https://www.fr.de/wissen/warten-auf-die-nova-am-himmel-forscher-berechnet-termin-fuer-die-sternexplosion-zr-93640098.html

#TCrB #Sterngucker #Kosmos #Wissenschaft #Sternexplosion #science

Eine farbenfrohe Darstellung einer explodierenden Nova im Weltraum, umgeben von leuchtenden Sternen und galaktischen Nebeln.

Recurrent nova #TCrB is still collecting material to it's surface, critical level not yet achieved to start eruption. Here a graph during 2025-03-15_0020-0200UT with 40sec time resolution using B filter, taken at Y71 Makroskooppi observatory. Some brightness flickering of it's accretion disk is visible.

Time graph showing recurrent nova T Corona Borealis brightness variability with Blue filter during 1 hour 40 minutes

@coreyspowell One last thing: the incoming #TCrB nova might be a type Ia event. It sits 2500 light years from here and will present as a new "guest star" or might even cast a second shadow during the day if the Chandrasekar limit is hit. I guess you especially will enjoy those few days of sky gazing.

When is T Coronae Borealis going to explode?

Despite earlier predictions that it would explode by September 2024, we’re still waiting. But it will happen — and when it does, it will brighten only briefly, so try not to miss it.
https://www.astronomy.com/observing/when-is-t-crb-going-to-explode/ via @astronomymag

#TCrB

Is T Coronae Borealis About to Light Up?

https://fed.brid.gy/r/https://www.universetoday.com/170944/is-t-coronae-borealis-about-to-light-up/

<p><em>Late is better than never for the ‘Blaze Star’ T Coronae Borealis</em>.</p>

<p>It was on track to be the <a href="https://www.universetoday.com/164601/top-astronomy-events-for-2024/">top astronomical event for 2024</a>… and here we are in <a href="https://www.universetoday.com/169952/top-astronomy-events-for-2025/">2025</a>, still waiting. You might remember around this time last year, when a notice went out that <a href="https://en.wikipedia.org/wiki/T_Coronae_Borealis">T Coronae Borealis</a> (‘T CrB’) might <a href="https://www.universetoday.com/165451/a-nova-in-the-making-will-t-coronae-borealis-pop-in-2024/">brighten into naked eye visibility</a>. Well, the bad news is, the ‘Flare Star’ is officially late to the celestial sky show… but the good news is, recent research definitely shows us that <em>something </em>is definitely afoot.</p>

<span id="more-170944"></span>

<p>The outburst occurs once every 80 years. First noticed by astronomer John Birmingham in 1866, T Coronae Borealis <a href="https://www.bbc.com/news/articles/c140exemgk7o">last brightened in February 1946</a>. That’s 80 years ago, this month. Located about 2,000 light-years distant on the Hercules/Corona Borealis/Serpens Caput constellation junction border, the star spends most of its time below +10<sup>th</sup> magnitude. Typically during outburst, the star flares and tops out at +2<sup>nd</sup> magnitude, rivaling the lucida of its host constellation, Alpha Coronae Borealis (Alphecca)

While the spectrum of #TCrB is currently acting up - https://skyweek.wordpress.com/2025/02/16/allgemeines-live-blog-ab-dem-16-februar-2025/#Feb16 - this probably does *not* mean that the next big eruption of the recurrent nova is imminent: https://forums.aavso.org/t/observing-campaigns-875-monitoring-t-crb/946/60 and https://www.facebook.com/david.iadevaia/posts/pfbid026ZgWvaFhPjkcfX2EtCgfvRAVR7p6wqgZ3SA5QmiX1W2eua22zDYTTHFzpbNpC87Zl

A funny way to 'monitor' #TCrB: the view of Cam 2 of the #AllSky7 system https://allsky7.net/index.html?&station=AMS216#liveview on the roof of a school in #Bochum, Germany - the limiting magnitude is a bit better than 2 (in the currently moonlit sky), so if the star blows and reaches 2 mag. it would actually show up as another point of light similar and close to Gemma.

Contrast-boosted and labelled, showing stars down to two point something.

@smorrell @skyglowberlin #TCrB #Astronomy

A frowning anthropomorphic cartoon figure at left holds out a tree branch, poking at an image cut out from a star atlas labeled "T Coronae Borealis". The caption reads "C'mon, do something...".

Les raies d'émission dans le spectre de #TCrB sont de plus en plus marquées, indiquant une augmentation de l'accretion dans le disque qui entoure la naine blanche. Bientôt le grand soir ? Peut-être...

Actuellement invisible à l'oeil, cette étoile le deviendra mais restera faible lors de la nova.

Raie d'émission dans le spectre de l'étoile T CrB entre mi-janvier et mi-février 2025. La raie est de plus en plus intense, indiquant une augmentation de l'activité autour de l'étoile qui devrait bientôt devenir une nova.

@skyglowberlin I’ve had my eye on #TCrB since last year. Exciting to see some reported changes in the spectral signatures of accretion. Looking forward to the eruption.

Fingers crossed for clear skies for all.

TCrB, TCrB, TCrB!

Too bad it's cloudy...

#Astronomy #TCrB

Tautenburger Astronomen melden "signifikante Änderungen im Spektrum von #TCrB. Die Emissionslinien im Spektrum sind sprunghaft angestiegen, was auf eine stark erhöhte Akkretionsrate hindeutet. Des Weiteren sind nun Emissionslinien zu sehen, die nur bei einer Temperatur von mindestens 40000 K entstehen können. [...] Dies könnten erste Anzeichen sein, dass die Nova in Kürze ausbrechen wird": https://www.tls-tautenburg.de/de/news/tautenburger-wissenschaftler-beobachten-auffaellige-veraenderung-im-spektrum-der-wiederkehrenden-nova-t-crb-und-bleiben-wachsam -> https://www.facebook.com/Cunolanghaar/posts/pfbid02SyQfQMGUdbYwiZim6ZETGu3Lhhcs9d7BvfYHkmwpdPoiRrHpw6tW7kxK7Pnv111El und https://www.astronomerstelegram.org/?read=17030

Entwicklung der Wasserstoff Emissionslinien um Hα im Spektrum von T CrB in den letzten zwei Wochen.

Pre-Outburst Observations of #TCrB with a Smart Telescope: https://iopscience.iop.org/article/10.3847/2515-5172/ad9fea -> "From 2024 April 2 to November 7, we obtained, through two Seestar S50 smart-telescopes, 8060 unfiltered photometric points. It was thus possible to calculate the orbital period of the binary system found to be 226.1 ± 3.8 days, lower than the officially recognized 227.5687 ± 0.0099 days but within the error bar. No outbursts were observed during this observation period."

Turns out I can still catch #TCrB from the attic in the early evening!

#CitizenScience
#Astronomy
#eVscope
#CitizenAstronomy

Il y a de nouvelles observations : c'est effectivement une fausse alerte. La magnitude est toujours aux alentours de 10 donc toujours pas de #nova.

#TCrB #astronomie

Le site https://spaceweather.com/ indique que la nova T CrB à actuellement une magnitude de 5,9. Cela pourrait vouloir dire que l'étoile commence une éruption. Le site de l'AAVSO montre toutefois que ce chiffre est basé sur une seule observation et en visuel donc le risque de fausse alerte est important. Les précédentes obs apparaissent avec une mag. normale mais datent de ~16h.

Si vous avez la possibilité c'est le bon moment pour vérifier (chez moi c'est ☁️☁️☁️).

#TCrB #nova #astronomie #astrodon

T CrB
https://theskylive.com/sky/stars/hr-5958-star
Oh. It's brightening..!? This is within normal ranges for it, however. Guess we'll see...

(Still dim, but it was magnitude 11.1 a week or two ago. Fingers crossed 🤞)

#TCrB #CoronaBorealis #Nova #RecurrentNova #binarystar
#astronomy #astrophysics #RedGiant #WhiteDwarf

#TCrB

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