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Nova Cas 2021 is still just above mag 12. Light curve attached. Further observations of its fade are encouraged.
Attachments:
Robin,
contact Prof Constantino Sigismondi at ICRA. His email is in the ATel I linked at the top
JeremyIndeed! Wonderful eating, super talks and good to be able to meet up with people, some of whom had not attended a BAA meeting for 3 years.
Munari and Valisa report in a recent ATel that this is a rare neon nova with an overabundance of neon in the ejecta, derived from the white dwarf: https://www.astronomerstelegram.org/?read=15796
This nova, which erupted in March 2021, is still above mag 12.
If anyone would like to be added to the email distribution for the VSS Circular, please drop me an email.
Just to add that single point observations of CG Dra are also especially welcome over the next days to constrain the start of the next bright outburst to which Max refers
Incredible as it may seem, it’s almost 3 years since the Great Dimming of Betelgeuse first hits the news. New papers continue to be published on the star, including a couple on the last 2 days:
UBVRI photometry of Betelgeuse over 23 years since 1999
Yojiro Ogane, Osamu Ohshima, Daisuke Taniguchi, Naohiro Takanashi
https://arxiv.org/abs/2211.04512Analysis of photometric and spectroscopic variability of red supergiant Betelgeuse
Daniel Jadlovsky, Jiri Krticka, Ernst Paunzen, Vladimir Stefl
https://arxiv.org/abs/2211.04380The second paper says that after the Dimming, the Betelgeuse mode of variability has fundamentally changed and is now instead following a shorter period of ∼200d (cf ~400+d, plus several longer periods, in previous epochs)
A paper on Visual Brightness Characteristics of Starlink Generation 1 Satellites based on visual mags measured for the satellites is available here: https://arxiv.org/abs/2210.17268
They show that adding the sunshades to the VisorSats can reduce brightness, this is phase angle dependent. The upshot is that VisorSats tend to be fainter than original satellites when near zenith and brighter when they are low in the sky and their azimuth is toward or away from the Sun. More recently, however, the satellites have not had these shades. The phase function for these Post-VisorSat spacecraft is intermediate between those of original and VisorSat.
The authors point out that in coming years Generation 2 satellites will be launched which are expected to be larger and possibly brighter.
Thanks for the update Stewart. It was below mag 18 last night. I’m looking forward to the next superoutburst.
Glad you enjoyed it, Alan. It was indeed an excellent meeting, which I was fortunate enough to attend in person, with interesting talks from David and Grant.
Period analysis can be performed using one of Peranso spectrum analysis tools. But these analyse the data globally, resulting in significant periods being identified, rather than calculating the ToMin that would be required for O-C analysis.
Hmmm…that is very odd Max. Could it be the recent dip is a random fluctuation rather than an eclipse?
