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HD180482 (22 Aql) is another suspect spectrum in the Melchiors database melchiorshd180482_THO_Pickles.png Black is the spectrum in Melchiors, Blue is the expected spectrum based on the spectral classification and IS extinction Red is my measurement using a mean of 3 different reference stars (2x Mil...

Very Interesting. Dr Heloise Stevance gave a talk at a BAA meeting this weekend on her work to develop a "Virtual Assistant" to initially classify transients from the ATLAS survey instruments. I have been confirming and classifying transients spectroscopically for many years, including som...

The spectrum of HD205021B (BD+69 1173B/bet Cep B) in the Melchiors library is not correct. It is either of the wrong star or is heavily contaminated by bet Cep, 13 arcsec away. (It also shows data reduction ripple artifacts) https://set-p-stweb.bm.icts.kuleuven.be/quicklook/893741_A1V_BD+691173B.png...

H alpha line profile 20240801.953 LHIRES 2400 R=15000
Cheers
Robin

R 900 spectrum (ALPY 600 10um slit) 20240830.888 taken 10 hours after classifying spectrum
Cheers
Robin

I have just changed from V2 to V3a and see the same problem (ReferenceStarFinder_V3a Excel 2019 Win 10) Michel Tasse modification "j'ai donc tenté de remplacer la formule dans la cellule V3 : "=(GSTL-T3)" par "=(temp!B9-T3)" gives the correct height for the target star but t...

Thanks for the reminder Hugh ! The periastron previous to that one was also followed in 2008-9 by the same "Convento" pro-am team. https://ui.adsabs.harvard.edu/abs/2011MNRAS.418....2F/abstract Here is what happened to the flat topped CIII line as the winds collided WR140_CIII_animation_fa...

A Type Ia so could reach mag 12 depending on extinction

If you are far enough south (not visible for me) a possible supernova AT 2024muv in NGC4699 has been discovered at mag 14.5
https://www.wis-tns.org/astronotes/astronote/2024-169
https://www.wis-tns.org/object/2024muv
https://alerce.online/object/ZTF24aatbpbr

Cheers
Robin

Just watched the BBC "The Sky at Night" piece on this. Great work guys ! https://www.bbc.co.uk/iplayer/episode/m001z95y/the-sky-at-night-hiding-in-starlight Unfortunately only available to watch in the UK but here are a couple of screen grabs Cheers Robin Hamish.png Olivier.png paper.png