Jul Grv
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jijugo.bsky.social
Jul Grv
@jijugo.bsky.social
61 followers 180 following 37 posts
Astronome amateur, passionné de sciences et joueur de tennis 🔭⚛️🎾
Posts Replies Media Videos
Reposted by Jul Grv
xipteras.org
Remembering the Mercury transit on 11 November 2019. #MercuryTransit
November 26, 2025 at 12:27 PM
Reposted by Jul Grv
apod.shinyakato.dev
🔭 Globular Cluster M15 Deep Field

Image Credit & Copyright: Alvaro Ibanez Perez

apod.nasa.gov/apod/ap25112...
A starfield is shown with thin wisps of gray and red running through it. In the center is an usual ball -- which is a globular cluster of stars upon closer inspection. Please see the explanation for more detailed information.
November 26, 2025 at 8:00 AM
Reposted by Jul Grv
hourlycosmos.bsky.social
Titan in "Methanovision" Rev171 - From Val Klavans (valklavans.bsky.social) - https://flic.kr/p/d7xW4E
Color composite of Titan, from Rev171 highlighting its methane content. The reddish part of this image corresponds to more haze (the north polar hood). The detached haze layer seen in this recent image by Cassini. This observation of a gibbous-phase Titan was part of the "Titan Monitoring Campaign" (TMC). These images were taken on September 04, 2012 and received on Earth September 07, 2012. The camera was pointing toward TITAN at approximately 1,275,131 miles (2,052,124 kilometers) away, and the images were taken using the CL1, CL2, BL1, MT1 and CB3 filters. I used Mike Malaska's "Methanovision" composites of Titan as a guide. Check out Mike Malaska's photostream here: bit.ly/P02k0A Credit: NASA / JPL / SSI / composite by Val Klavans
November 26, 2025 at 9:00 AM
Reposted by Jul Grv
citedelespace.bsky.social
🛰️C'est la dernière fois que l'ISS accueille de nouveaux habitants avant le vol de Sophie Adenot. Le Crew-12 doit décoller le 15 février prochain. Ces trois astronautes vont donc partager le quotidien de la Française.
November 26, 2025 at 10:03 AM
Reposted by Jul Grv
astroaure.bsky.social
🛰️ Il est là haut ! Le petit rover IDEFIX est sur le module d'exploration, pour pouvoir être facilement déposé à la surface de Phobos, une des deux lunes de Mars. Les petits cubes blancs sur lui permettront d'amortir l'impact lors de son atterrissage

📸 ISAS (MMX) & @astroaure.bsky.social (IDEFIX)
November 26, 2025 at 10:32 AM
Reposted by Jul Grv
apod.shinyakato.dev
🔭 The Observable Universe

Illustration Credit & Licence: Wikipedia, Pablo Carlos Budassi

apod.nasa.gov/apod/ap25112...
A diagram is shown depicting various parts of the universe that are observable. In the middle are the parts closest to Earth, and around the far edges are parts furthest from Earth. Planets, galaxies, and the CMB are illustrated. Please see the explanation for more detailed information.
November 23, 2025 at 8:00 AM
Reposted by Jul Grv
drnereide.bsky.social
This historic picture of Jupiter’s southern half always stops me in my tracks.

Voyager 2 grabbed it on 25 June 1979 when it was already down to 12 million kilometres and still closing fast.

photojournal.jpl.nasa.gov/catalog/PIA0...

Pic by NASA/JPL

🔭 🧪 #science

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Colour photo from 1979 showing Jupiter’s southern half with its creamy and reddish-brown cloud belts swirling across the disk. The Great Red Spot is visible on the left side. In front of the planet, the moon Io appears as a bright sphere about the size of our Moon. Deep black space all around. Taken by Voyager 2.
November 25, 2025 at 11:43 PM
Reposted by Jul Grv
siril.org
A new script is now available. It allows you to create HR diagrams on your linear images!!!

Have fun
November 22, 2025 at 2:21 PM
Reposted by Jul Grv
astropierre.com
GRAVITY+ : tirés depuis chacun des 4 télescopes géants du VLT, 4 faisceaux lasers créent maintenant des étoiles artificielles à 90 km d'altitude qui permettent au système d'optique adaptative de corriger en temps réel le flou causé par l'atmosphère terrestre.

www.insu.cnrs.fr/fr/cnrsinfo/...
GRAVITY+ : quatre étoiles lasers inaugurent une nouvelle ère pour l'interférométrie au Very Large Telescope
Le 10 novembre dernier, quatre lasers ont simultanément percé le ciel du Cerro Paranal au Chili, marquant une étape majeure du projet GRAVIT
www.insu.cnrs.fr
November 24, 2025 at 9:57 AM
Reposted by Jul Grv
starxiv.bsky.social
Payel's first paper finds compelling evidence for an off-axis merger event in the Coma cluster using high-resolution X-ray spectroscopy of the intracluster medium. 🔭☄️ arxiv.org/abs/2511.10740
November 24, 2025 at 10:23 AM
Reposted by Jul Grv
tamithaskov.bsky.social
This coronal hole could give us uneven bursts of fast wind thanks to active Region 4292 which has emerged right in the middle of it. Expect several magnetic polarity inversions in the fast wind stream too, thanks to this subtle complexity!
g7izu.bsky.social G7IZU Radio Reflection Detection @g7izu.bsky.social · 3d
Space Weather

An equatorial coronal hole is facing Earth. We should expect some high-latitude aurora activity from this on or around 27 Nov.

Some interesting looking prominences are visible on images from the ground-based Solar Flare Telescope at Mitika, Japan.

#spaceweather
#g7izu
NASA/SDO Filter AIA193. A coronal hole is visible dead center of the solar disc. Solar Science Observatory NOAJ Mitaka, Japan: Hα fulldisk image Solar Science Observatory NOAJ Mitaka, Japan: Hα image Solar Science Observatory NOAJ Mitaka, Japan: Hα image
November 24, 2025 at 2:16 AM
Reposted by Jul Grv
vincentledvina.bsky.social
Positive-polarity coronal holes 98 and 99 are now facing Earth and sending fast wind our way. This solar wind enhancement may reach us in 2-3 days and cause G1-G2/Kp 5-6 conditions. We are already seeing a field enhancement likely caused by an SSBC. More activity may be coming.
November 23, 2025 at 7:27 PM
Reposted by Jul Grv
apod.shinyakato.dev
🔭 3I/ATLAS: A View from Planet Earth

Image Credit & Copyright: Rolando Ligustri

apod.nasa.gov/apod/ap25112...
Now outbound after its perihelion or closest approach to the Sun on October 29, Comet 3I/ATLAS is only the third known interstellar object to pass through our fair Solar System. Its greenish coma and faint tails are seen against a background of stars in the constellation Virgo in this view from planet Earth, recorded with a small telescope on November 14. But this interstellar interloper is the subject of an on-going, unprecedented Solar System-wide observing campaign involving spacecraft and space telescopes from Earth orbit to the surface of Mars and beyond. And while the comet from another star-system has recently grown brighter, you'll still need a telescope if you want to see 3I/ATLAS from planet Earth. It's now above the horizon in November morning skies and will make its closest approach to Earth, a comfortable 270 million kilometers distant, around December 19.
November 21, 2025 at 8:00 AM
Reposted by Jul Grv
kaynouky.bsky.social
N'empêche avec 1,5 t de cargo pour 10 t au lancement, l'atterrisseur Argonaut de l'ESA réaliserait un ratio équivalent à Blue Moon Mk1 (15 vs 14%).

Aussi d'après l'expérience des stations orbitales 1,5 t c'est en théorie de quoi convenir aux besoins de 4 astronautes pendant environ un mois et demi.
ESA
November 24, 2025 at 11:01 AM
Reposted by Jul Grv
astropierre.com
En produisant 15 000 atomes d'antihydrogène toutes les 7 heures, en continu, il faudrait 80 MILLIONS D'ANNÉES pour en produire une quantité suffisante pour dégager autant d'énergie qu'une grenade (en imaginant qu'on puisse les stocker tout ce temps).

La bombe à antimatière, c'est pas pour demain.
physicsworld.bsky.social Physics World @physicsworld.bsky.social · 5d
Physicists working on the ALPHA experiment at CERN have trapped and accumulated 15,000 antihydrogen atoms in less than 7 h. This accumulation rate is more than 20 times the previous record. 🧪⚛️ ow.ly/iKgP50XvMEC
Sympathetic cooling gives antihydrogen experiment a boost – Physics World
Having more antimatter could help solve profound mysteries of physics
ow.ly
November 24, 2025 at 11:08 AM
Reposted by Jul Grv
newscientist.com
AlphaEvolve, an AI system created by Google DeepMind, is helping mathematicians do research at a scale that was previously impossible - even if it does occasionally "cheat" to find a solution
Mathematicians say Google's AI tools are supercharging their research
AlphaEvolve, an AI system created by Google DeepMind, is helping mathematicians do research at a scale that was previously impossible - even if it does occasionally "cheat" to find a solution
www.newscientist.com
November 21, 2025 at 10:24 AM
Reposted by Jul Grv
skymaps.com
🌟Uranus reaches opposition at 12h UT on November 21st. Mag. 5.6.

The distant planet is currently located a few degrees south of the Pleiades star cluster (M45). Uranus is easy to spot with a set of binoculars. Refer to the chart and search for a pale blue "star".
#stargazing
A computer simulated view of the star clusters known as the Hyades and the Pleiades showing the current location of the planet Uranus. Credit: Sky Safari Pro
November 21, 2025 at 10:52 AM
Reposted by Jul Grv
apod.shinyakato.dev
🔭 The Galactic Plane: Radio Versus Visible

Image Credit: Radio: S. Mantovanini & the GLEAM team; Visible: Axel Mellinger (milkywaysky.com)

apod.nasa.gov/apod/ap25111...
November 18, 2025 at 8:00 AM
Reposted by Jul Grv
langinspace.bsky.social
Petit quiz astro. Selon vous combien d'étoiles ont un nom de baptême officiel*, comme "Bételgeuse", "Sirius", "Rigel", etc. ?

A : 500
B : 1500
C : 5000
D : 10000

*officiel car adopté par l'IAU (Union astronomique internationale)
a night sky filled with lots of stars and the words maximum works below it
ALT: a night sky filled with lots of stars and the words maximum works below it
media.tenor.com
November 19, 2025 at 2:10 PM
Reposted by Jul Grv
astropierre.com
2/

Cette immense structure a été mise en évidence grâce aux données des satellites Gaia et TESS.

Le papier "Lost Sisters Found: TESS and Gaia Reveal a Dissolving Pleiades Complex" est disponible ici :

arxiv.org/abs/2511.07533
Lost Sisters Found: TESS and Gaia Reveal a Dissolving Pleiades Complex
Most star clusters dissolve into the Galaxy over tens to hundreds of millions of years after they form. While recent Gaia studies have honed our view of cluster dispersal, the exact chronology of whic...
arxiv.org
November 19, 2025 at 12:54 PM
Reposted by Jul Grv
astropierre.com
Les Pléiades est un célèbre petit amas d'étoiles dont une dizaine est facilement visible à l'œil nu dans le ciel

Elles sont au centre d'une structure bien plus vaste contenant un nombre considérable d'étoiles réparties sur plus de 600 parsecs, maintenant appelée "Complexe des Grandes Pléiades"

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Schéma de l''étendue complète du complexe des Pléiades tel qu'il apparaîtrait dans le ciel nocturne si toutes les étoiles étaient visibles à l'œil nu. Les sept étoiles les plus brillantes des Pléiades (et visibles à l'oeil nu, elles) sont représentées en vert, les autres sont en blanc.
November 19, 2025 at 12:54 PM
Reposted by Jul Grv
astropierre.com
Fantastique !
Cette image est une véritable prise de vue du télescope spatial James Webb, pas une illustration d'artiste.

Elle montre 4 enveloppes de poussière enroulées autour d'une paire d'étoiles Wolf-Rayet nommées Apep, qui se croisent tous les 190 ans en éjectant de la poussière carbonée.

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Cette image en infrarouge moyen par le télescope Webb révèle pour la première fois quatre enveloppes de poussière enroulées autour d'une paire d'étoiles Wolf-Rayet nommées Apep. Les observations précédentes d'autres télescopes n'en avaient montré qu'une seule. Les données de Webb ont également confirmé l'existence de trois étoiles liées gravitationnellement dans ce système.
November 19, 2025 at 4:39 PM
Reposted by Jul Grv
stsci.edu
Three #NASAWebb discoveries in ONE! Webb shows there are FOUR dust shells (only one was previously seen), allowing researchers to narrow the stars’ orbit of one another to a LONG 190 years. Plus, they confirmed a third star is part of the “party”: https://bit.ly/4n1tpas 🔭 🧪
November 19, 2025 at 4:02 PM
Reposted by Jul Grv
astrobin.com
AstroBin's Image of the Day: "IC2220, Toby Jug Nebula" by wsg

www.astrobin.com/pvskb0/

#astrophotography
IC2220, Toby Jug Nebula
November 19, 2025 at 12:03 PM
Reposted by Jul Grv
science.esa.int
Webb's #NIRSpec has helped astronomers weigh up a supermassive black hole in the early Universe – and found it much more massive than expected.

Read more 👉 www.esa.int/Science_Expl...
🧪 🔭
The left side of this visual shows an image of many glowing galaxies in various shapes and colours, on a black background. A small box near the top of this image highlights a small collection of galaxies. This box is pulled out to the right side, showing the same area zoomed in. This region shows a small circular red galaxy in the centre, which is labelled “CANUCS-LRD-z8.6”. Credit: ESA/Webb, NASA & CSA, G. Rihtaršič (University of Ljubljana, FMF), R. Tripodi (University of Ljubljana, FMF)
November 19, 2025 at 11:10 AM