Martin Mašek

🧵1/3: Se začátkem roku jsem opět aktualizoval sdílený český kalendář nebeských úkazů – www.jantichy.cz/ukazy. Najdete v něm všechny klíčové úkazy pro nadcházející rok. A to včetně ikonky s viditelností a hlavně včetně textu popisujícího podrobněji daný úkaz v detailu většiny událostí.

🎉 Arktický mořský led od roku 1979 ubyl o cca polovinu. Ale Epoch times teď přišly s bombastickým zjištěním, že prý netaje.
🧐Jak může roztát o 1/2 a přitom netát?
💪Je za tím takový malý tríček a na zub se mu podívala naše nová posila - polární ekoložka Marie Šabacká. 1/🧵

Much better view 😊🎨

Image credit:

Worldurbanplanning on instagram.

bsky.app/profile/kosm...

Islandský ledovec Breiðamerkurjökull zachycený 11. 11. 2025 satelitem Sentinel-2. Mezi červenou a modrou hranicí je 6km rozdíl.

A large galaxy cluster with many lenses.

#Galaxy cluster Abell 370 with #JWST NIRCam 🔭
commons.wikimedia.org/wiki/File:Ab...

The iconic Earthrise photo

57 years ago, on this day, the iconic earthrise photo was taken during apollo 8 🌎

“Monster Stars” existed in the early universe Astronomers analyzing data from Webb have discovered evidence of gigantic stars that formed right after the Big Bang.

Kde se vzaly supermasivní černé díry vzniklé krátce po Velkém třesku?

Odpověď nabízí nová studie založená na pozorováních vzdálené galaxie GS 3073 učiněných dalekohledem Jamese Webba

Krátce po vzniku vesmíru musely existovat supermasivní hvězdy!🧵
www.astronomy.com/science/mons...

A starry night sky with the Milky Way visible and the silhouette of binoculars pointing up at it.

being under a sky like this is the best therapy 🌌

A pale blue dwarf galaxy seen on the black backdrop of space with some faraway galaxies. The galaxy itself resembles a fuzzy cloud of tightly-packed stars, with a broad halo of stars dispersed around it. Several small, glowing patches of gas are spread across the galaxy’s core, where very hot stars are concentrated.

This ESA/NASA #Hubble Telescope image shows a blue compact dwarf galaxy called Markarian 178 🔹

These galaxies get their name from the Armenian astrophysicist Benjamin Markarian. 🧪🔭

🔗 esahubble.org/images/potw2...

@science.esa.int @stsci.edu

Temu není Ježíšek. Kolik doopravdy stojí dárky za pár korun - VOXPOT: reportáže, které spojují Česko se světem Megalomanská reklama, praktické vychytávky za desetinu ceny. No nekupte to? Do Evropské unie každý den dorazí více než dvanáct milionů levných balíčků z online tržišť jako Temu nebo Shein. Co ale za j...

Doufám, že tam nenakupujete…

Kilauea is doing what Kilauea does.

Watch live:

www.youtube.com/watch?v=fiyt...

(h/t to @sophiecarr.bsky.social)

30 let v kosmickém prostoru včera oslavila evropská solární observatoř SOHO. Ta přitom měla podle původního plánu fungovat jen 3 roky, takže plán překonala již o 27 let.

Kromě mnoha objevů ve sluneční fyzice objevila také přes 5000 komet.

Image of comet C/1989 V1 (Aarseth-Brewington) of 1989 Dec 20, by Michael Jäger, https://fg-kometen.vdsastro.de/pix/test/bild.php?nr=8375

#bskycometography no. 365

C/1989 W1 (Aarseth-Brewington)

1989 Nov 16: Discovered by K. B. Aarseth (Norway) and H. J. Brewington (USA) at 8.5 mag. Prediscovery images of Sep 1. The comet passed perihelion on Dec 27 and reached 3 mag. It was last finally seen on 1990 Jan 31.
☄️🔭 #CometWatch

For the folks that are still struggling with this. Here is a Venn Diagram.
#3I/Atlas #3I 🔭

Image of C/1956 R1 by on 1957 Apr 27 by R. Waterfield, BAA Comet Section, https://britastro.org/cometobs/1956r1/1956r1_19570427_rwaterfield.html

#bskycometography no. 357

C/1956 R1 (Arend-Roland)

1956 Nov 8: Discovered by S. J. V. Arend & G. Roland (Belgium) at 10 mag. Predisc of Nov 7 from Japan. The comet reached 1 mag around perihelion (1957 Apr 8 at 0.32 au). Max tail 30° and 15° sunward tail! Last seen on Apr 11.
☄️🔭 #CometWatch

Image of comet C/2018 V1 on 2018 Nov 18, by Michael Jäger, https://fg-kometen.vdsastro.de/pix/test/bild.php?nr=20224

#bskycometography no. 356

C/2018 V1 (Machholz-Fujikawa-Iwamoto)

2018 Nov 7: Disc by D. E. Machholz (visual), S. Fujikawa & M. Iwamoto (Japan) at 10 mag. It's the last visual comet discovery! Perihelion on Dec 3 at 0.39 au w/ 7-8 mag. Last seen on Dec 17, possibly disintegrated.
☄️🔭 #CometWatch

A comet with a long, wiggly tail.

Michael Jäger does Michael Jäger things: C/2025 A6 (Lemmon) on Oct 26.
forum.vdsastro.de/viewtopic.ph... which also has an animation.
🔭☄️

Thanks for clarifying!

According to MPC database, the last observation of C/1984 U1 is from 1991 11 02: www.minorplanetcenter.net/db_search/sh...

The chateau in Žamberk (Senftenberg) and the castle garden, where the observatory stood from which Brorsen discovered two comets, C/1851 P1 and C/1851 U1. A nice place to visit, the garden is freely accessible. The chateau currently houses a secondary school.

Image of Theodor Johann Christian Ambders Brorsen of around 1875, https://www.jessenb.dk/Nordborg/Hvemvarde/Brorsen.html

#bskycometography no. 340

C/1851 U1 (Brorsen)

1851 Oct 22: Discovered by T. J. C. A. Brorsen (Czechia) at 4 mag with a "brilliant tail" longer than 1° and a small anti-tail. The comet was past perihelion (Oct 1 at 0.14 au) and faded afterwards. It was last detected on Nov 21.
☄️🔭 #CometWatch

Starplot Star charts and maps of the sky in Python

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

Thank you Maik!

Any information about the visual prediscovery of comet C/1978 T1? Was K. Cernis unaware when he observed it visually before oficial discovery?

Jane Goodall, primatologist and friend to chimpanzees, dies at 91 She used her global fame to draw attention to the plight of dwindling chimpanzee populations and, more broadly, to the perils of environmental destruction.

Legendary primatologist Jane Goodall has died at 91:
www.washingtonpost.com/obituaries/2...

Miluju matematické a chemické anekdoty!

Tohle mi trvalo asi 10 sekund, holt hlava už unavená. :o)))

The librarian who became Palomar’s first female telescope operator, and who discovered her own comets From 1985 to 2014, Jean Mueller supported astronomers from around the world who came to Palomar to use its iconic instruments. At the same time, she learned how to operate all three of its major teles...

This is a nice article about Jean Mueller and her career at Palomar Observatory: www.latimes.com/science/stor... .

Jean once saved me from pointing the Palomar 200-inch telescope in the wrong direction.

Srovnání velikosti prvních tří amerických kosmických lodí. Mercury dole, Gemini uprostřed a nahoře Apollo i s lunárním modulem.