Prof. Josep M. Trigo-Rodríguez
@joseptrigo.bsky.social
1.3K followers 590 following 380 posts
Astrophysicist and science writer. My ongoing research lines include: Meteoritics, primordial planetary system materials, their physico-chemical properties, transport of volatiles to planets, planetary atmospheres and astrobiology. Saganist
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joseptrigo.bsky.social
#InterstellarComet #3I yesterday among background stars in a sequence of images under extremely dark skies at Observatori del Montsec @ieec.cat #Catalonia. 6 selected images every 2 min. in 3.2×2.5 arcmin² FOV using the 0.8 m Joan Oró robotic telescope👇
#PlanetSci
theconversation.com/descubierto-...
joseptrigo.bsky.social
When a sample return mission from #Ceres?
#Astrobiology #PlanetSci
setiinstitute.bsky.social
#ICYMI: In last week's #SETILive, Dr. Sam Courville explained how and why the dwarf planet Ceres may be the key to understanding astrobiology. Watch the full interview: youtube.com/live/AMxbk9f... 🧪 🔭 👩‍🔬
joseptrigo.bsky.social
2) As bonus track the image of the green coma a half hour later, just during twilight. Really beautiful!
Reposted by Prof. Josep M. Trigo-Rodríguez
stim3on.bsky.social
Lastly, that bright streak in the Navcam images is actually Phobos. See below for a short analysis of this image.

It's very sad that NASA isn't able to put the record straight with the current political chaos.

bsky.app/profile/stim...
stim3on.bsky.social
Short version: left is my processesed Navcam image, right is the Stellarium simulation for the image.
The bright elongated thing is Phobos being smeared by long exposure.
Acturus and the big dipper stars are also visible. 3I/Atlas is wayyy to dim to be seen in the image.
joseptrigo.bsky.social
COMET #C2025A6 #LEMMON WITH ITS TAIL THIS MORNING in a stacked image of 35 images, 10 s exp.each. Despite the Full Moon interference, really beautiful green coma through the telescope in +6 mag. A pleasure enjoying this fascinating moment with my wife.
To find it
theconversation.com/dos-nuevos-c...
joseptrigo.bsky.social
So sad of watching such a level of demential #Chaos in #US streets right now. Too many videos of paramilitary at work, kidnapping citizens.
Her husband is hopefully back home, but how many others won't be ever back...
#EvilWillBeProud #EvilAtWork
maaloufmd.bsky.social
My husband was detained by ICE today

Juan Muñoz, an American citizen, father of 2, and local government official, was peacefully protesting w. other elected officials. He was assaulted and taken away

I have had zero contact or updates since

#SOS
@duckworth.senate.gov @durbin.senate.gov
joseptrigo.bsky.social
COMET #C2025A6 #LEMMON THIS MORNING from #MontsenyObservatory
The coma is already about 10 arcmin wide, and +5.9 V magnitude. I share a 10 s exposure image where it compares with +3.1 mag. Tania Australis (mu UMA) M0 star. Description+charts to find it
theconversation.com/dos-nuevos-c...
#PlanetSci
Reposted by Prof. Josep M. Trigo-Rodríguez
astrododi.bsky.social
#comet C/2025 A6 Lemmon on Oct. 1. Tail structure is already very nice. Unfortunately just 12 x 120s before the fog rolled in this morning. Astro-Physics AP130GTX refractor at f/5. ZWO ASI2600MC, tracked on the comet. #astronomy #astrophotography #solarsystem #comets #comettail #space
Reposted by Prof. Josep M. Trigo-Rodríguez
dimkate.bsky.social
A nice clear sky helped me photograph comet C/2025 A6 (Lemmon) on 1 October 2025. The ion tail is becoming brighter and full of streamers and the dust tail grows. #cometWatch #astrophotography
A comet with a tail among the stars. The green gasy coma is about 10 arcminutes across. The ion tail extends beyond the edge of the frame.

Equipment: GSO N203/800 with TS GPU cc, AZ-EQ5, unmodified Olympus E-PL5.

Exposure: 100x30s, from B4 skies of eastern Crete.

Edited with DSS, SIRIL and GIMP.
Reposted by Prof. Josep M. Trigo-Rodríguez
lyndie.bsky.social
The Ghost of Cassiopeia nebula. Cassiopeia (the bright star) is an Ethiopian queen in Greek mythology. Her star illuminates nearby dust clouds, imparting a ghostly, ethereal appearance.

Image credit: my tiny telescope (about 4 hours of light collecting).

#science #astronomy 🔭👩🏾‍🔬
A nebula with red and blue colors faintly glows in the light of a very bright star.
Reposted by Prof. Josep M. Trigo-Rodríguez
redspmn.bsky.social
MOSAICO DE IMÁGENES mostrando la evolución del cometa #Lemmon durante los últimos meses. Indica la distancia al Sol (R) y a la Tierra (D) en Unidades Astronómicas (u.a.). Lo tenemos ahora en el amanecer en el límite a simple vista 🤩
📷 Dídac Mesa Romeu desde #Castelló/#Castellón
Reposted by Prof. Josep M. Trigo-Rodríguez
redspmn.bsky.social
GRAN BÓLIDO ESPORÁDICO #SPMN041025L REGISTRADO SOBRE #ALBACETE ANOCHE a las 23h56m13s TUC (1h56 CEST de hoy). Así lo registró Jordi Donet @jordidonet.bsky.social desde Barx-La Drova, #València. De origen cometario, se desintegró en altura dejando una preciosa estela
▶️ www.ice.csic.es/news/citizen...
joseptrigo.bsky.social
Spectacular #Taurid #Fireball in front of #Portugal last night. Amazing nights for wide-field #astrophoto 🤩
#PlanetaryScience
redspmn.bsky.social
ESPECTACULAR BÓLIDO #SPMN041025K FRENTE A LISBOA, #PORTUGAL ANOCHE a las 22h47m12s TUC (0h47 CEST de hoy). Así lo capturó Antonio J. Robles @ajrobles.bsky.social desde Estepa, #Sevilla. La ablación transcurrió en dos fases, con una fragmentación apreciable. 🤩☄️👇👏
➡️ www.ice.csic.es/news/citizen...
joseptrigo.bsky.social
Thanks. Indeed Mare is a "basaltic" Sea 😉
Reposted by Prof. Josep M. Trigo-Rodríguez
jgil65.bsky.social
Epsss!! Això és d'aquí a una estoneta. Si sou a prop no deixeu de perdre l'ocasió. 🧐👇
joseptrigo.bsky.social
EL PRÒXIM DISSABTE 4 D'OCTUBRE us esperem de 21h a 23h a l'Ermita de Sant Llop de Riells i Viabrea, #Girona, #Catalunya. Gaudirem de la Nit Internacional d'Observació de la #Lluna amb tots els que ens acompanyeu en una nit realment única
#DiaInternacional #ObservemLaLluna
#CiènciaEnCatalàNaturalment
joseptrigo.bsky.social
FOR ALL FRIENDS OBSERVING THE #MOON TONIGHT: Just sharing with you the main features visible on our satellite over this weekend (craters in bold, Lunar maria in cursive)
Join the closest outreach initiative to enjoy it through the telescope🌔🔭🤩
#InternationalObserveTheMoonNight #Moon #PlanetSci
joseptrigo.bsky.social
I'm also expert in comets, so I know well what is +6.5 magnitude, in the limit of naked eye visibility. Anyhow, it is great promoting more observations. Now it it is just starting to be seen at naked eye in perfect sky conditions. In fact I saw it yesterday very easily using binoculars on Bortle 4
Reposted by Prof. Josep M. Trigo-Rodríguez
philplait.bsky.social
Faster than light travel is possible… kinda. Distant galaxies are receding from us at superluminal speeds. How can that be, and how can we see them if they're flying away faster than the light they emit?

Even weirder: to them, *you*re* moving FTL!

www.scientificamerican.com/article/how-...

🔭🧪
Warp Speed! How Some Galaxies Can Move Away from Us Faster Than Light
When space itself expands, weird things can happen—like galaxies breaking the universe’s ultimate speed limit
www.scientificamerican.com
joseptrigo.bsky.social
#Comet #Lemmon #C2025A6 is already a naked eye object!

theconversation.com/dos-nuevos-c...

Image on 2025-10-03 2.24 UT RGB 25min, Zeiss-Milvus f-135/2.8 Asi 294 field 8x6°
by Michael Jäger & Gerald Rhemann
#Wov!🤩
Reposted by Prof. Josep M. Trigo-Rodríguez
sergiopereiralema.bsky.social
I've found a really good Python library to create your own Sky Maps: starplot.dev. Really amazing to prepare observation nights. And great support of his developer, Steve Berardi.

#AstroMethods
Starplot
Star charts and maps of the sky in Python
starplot.dev
Reposted by Prof. Josep M. Trigo-Rodríguez
spectraltypos.bsky.social
Paper day!

You're doing ground-based high-resolution exoplanet transmission spectroscopy and want to analyse the planet—not the star or Earth's atmosphere.

Is there a way to disentangle your spectrum *without* destroying the planet signal?

arxiv.org/abs/2509.12737

🧵⬇️

🔭 #exoplanets #astromethods
TSD: An inverse problem approach for recovering the exoplanetary atmosphere transmission spectrum from high-resolution spectroscopy
Our ability to observe, detect, and characterize exoplanetary atmospheres has grown by leaps and bounds over the last 20 years, aided largely by developments in astronomical instrumentation; improveme...
arxiv.org
Reposted by Prof. Josep M. Trigo-Rodríguez
cfp-ciemat.bsky.social
COSMOLOGÍA cap. 2: Los cartografiados

Hoy es queremos contar qué son los cartografiados cosmológicos y contaros un poco cómo los utilizamos (son muchas cosas, así que iremos poco a poco)

#galaxy #galaxias #cosmologia #universo #divulgación
Nuestro trabajo en Cosmología. Cap. 2: Los Cartografiados. Se incluye una imagen de la luna a gran escala detrás de un observatorio (Credit: M. Hernández/H. Stockebrand)
Reposted by Prof. Josep M. Trigo-Rodríguez
stim3on.bsky.social
This photo from the Perseverance rover captured in early March, may be my favorite Mars image from this year.

It shows Mars' smaller moon Deimos over the hills of the Nili Planum region in the dark skies before dawn. 🔭

Full res: flic.kr/p/2rwUwV7

Credit: NASA/JPL-Caltech/Simeon Schmauß
A picture of Mars taken during astronomical twilight (the sun was 13° below the horizon). It shows a dimly lit reddish landscape with some hills at the horizon. Deimos, Mars' smaller moon shines with a small halo in the pale sky above.
joseptrigo.bsky.social
#Comet 𝟮𝟬𝟮𝟱 𝗔𝟲 (𝗟𝗲𝗺𝗺𝗼𝗻) is getting bright. It will be

Beautiful image by
📷 Aleix Roig @astrocatinfo.bsky.social on Oct.2 ☄️

I wrote this article in @es.theconversation.com to find it:
theconversation.com/dos-nuevos-c...

Just prepare your telescopes and cameras, be ready for this beauty!