You heard it here first! We already showed last December that this nebula was in the Milky Way, not in Andromeda. Here is the paper: 🔭 arxiv.org/abs/2412.08327 With the @gtctelescope.bsky.social we measured the speed of the nebula, and found that it was much too slow to be related to Andromeda

Last week we submitted the revised version of a paper led by @alumbrerasc.bsky.social with our data and analysis of this nebula, somewhat in conflict with the conclusions of Ogle et al. 😅

We've been following 3I/ATLAS from @cefca-oaj.bsky.social in Spain (Teruel)! This is just the 3rd interstellar object that we see enter the Solar System. I created this video with the observations🔭 we have made: you can see the comet moving through the field of stars. We hope to get more data!

🔭Researchers from @CEFCA_OAJ have followed the footsteps of the Lyman photons to CRETA. There, a conference on Lyalpha emitters was held, organised by the @IAstroPt ✨ Juan Antonio Fernández Ontiveros, Alejandro Lumbreras, Rahna Payyasseri Thanduparackal and Stefano Zarattini🤳 CONGRATS!!!

Hasta el Torico ha mirado al #EclipseSolar hoy en Teruel! Even the statue of the Torico (little bull) was looking at the #solareclipse2025 today in Teruel (Spain)!

⚠️ A warning to my fellow astronomers🧪🔭: there seems to be a potentially systematic issue in ApJ introducing errors in citations in the production stage of papers, so if you have a current paper with them, check your proofs *very* carefully. ⚠️

An interesting occultation by PHA 2024YR4 on Feb 6 of a bright 11-mag star. The uncertainty is large and the occultation partial because of the diffraction but if we line up hundreds @unistellar.bsky.social telescopes along the path of uncertainty we will catch it, so refine its orbit. #needfunding

Between 2019 and 2023, researchers paid $8.968 billion to make papers open access. Imagine what else could be done with this money if it wasnt paid to for profit publishing companies... 👉 arxiv.org/abs/2407.16551

Charla muy interesante de Enrique Pérez-Montero (@iaacsic.bsky.social) ayer en @www.unizar.es (en Teruel) sobre la sonificación de datos astronómicos. Muchos datos que mostramos como imágenes son adaptaciones para entenderlos mejor, y también se pueden traducir a sonidos y ser útil para todos.

En @pcoffeebreak.bsky.social comentaron mi paper sobre la misteriosa nebulosa "cerca" de la galaxia de Andrómeda!🔭 Qué ilusión! 🎉 ¿Dónde está realmente? ¿Cómo la analizamos? ¿Qué es exactamente?Aquí @darksapiens.bsky.social, coautor del paper, cuenta lo que sabemos: www.youtube.com/live/YXvicot...

Remember the mysterious oxygen nebula discovered near the Andromeda galaxy #M31? Today we try to decipher it! It's ✨Paper Day✨ arxiv.org/abs/2412.08327 With spectra from GTC (the largest 🔭) and OAJ large narrowband images we find the nebula is actually not related to M31! But how?👇 #Astrophysics

Remember the big [O III] nebula discovered near the Andromeda galaxy? @alumbrerasc.bsky.social got imaging with T80Cam @ OAJ and spectroscopy with MEGARA @ GTC and it doesn't look extragalactic to us! 🔭 arxiv.org/abs/2412.08327

The most detailed imaging survey of the Universe is available now! 🔭 J-PAS has presented its first public data release. It has 800 000 objects observed with 54 narrowband filters!

@bot.astronomy.blue signup

J-PAS Early Data Release is now public! www.cefca.es/news/show/284 🔭

Despite @darksapiens.bsky.social best efforts to shake me up, I calmly gave a talk at the J-PAS annual conference... until the two minute warning came and I panicked mid-sentence "... the emission line H-aaAAAAAAAlpha!"

Back to work after the summer break, back to trying to finish some papers! 📝 Also back to preparing observing proposals. Hopefully getting IFU spectra on galaxies similar to this one: blue, extremely star-forming, and analogous to the very high redshift ones.

Hi! I am starting in BlueSky taliking about another beginning: J-PAS, the most detailed imaging survey ever has just started, observing the sky from Teruel, Spain. With 56 filters imaging thousands of squared degrees, we will open huge new window into the Universe! www.cefca.es/news/show/252