Martin Mašek
@cassi-astronomy.bsky.social
Avid observer of comets, asteroids, variable stars and DSO. Geography and geology enthusiast. Comet discoverer.
Minor planet 9841 and comet C/2024 Y1.
Minor planet 9841 and comet C/2024 Y1.
Reposted by Martin Mašek
#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
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
November 16, 2025 at 2:59 PM
#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
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
Reposted by Martin Mašek
November 11, 2025 at 5:30 AM
Reposted by Martin Mašek
#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
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
November 8, 2025 at 3:37 PM
#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
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
Reposted by Martin Mašek
#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
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
November 7, 2025 at 2:59 PM
#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
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
Reposted by Martin Mašek
Michael Jäger does Michael Jäger things: C/2025 A6 (Lemmon) on Oct 26.
forum.vdsastro.de/viewtopic.ph... which also has an animation.
🔭☄️
forum.vdsastro.de/viewtopic.ph... which also has an animation.
🔭☄️
October 27, 2025 at 9:04 PM
Michael Jäger does Michael Jäger things: C/2025 A6 (Lemmon) on Oct 26.
forum.vdsastro.de/viewtopic.ph... which also has an animation.
🔭☄️
forum.vdsastro.de/viewtopic.ph... which also has an animation.
🔭☄️
Reposted by Martin Mašek
#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
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
October 22, 2025 at 2:40 PM
#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
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
Reposted by Martin Mašek
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
#AstroMethods
Starplot
Star charts and maps of the sky in Python
starplot.dev
September 17, 2025 at 1:29 PM
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
#AstroMethods
Reposted by Martin Mašek
Legendary primatologist Jane Goodall has died at 91:
www.washingtonpost.com/obituaries/2...
www.washingtonpost.com/obituaries/2...
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.
www.washingtonpost.com
October 1, 2025 at 6:11 PM
Legendary primatologist Jane Goodall has died at 91:
www.washingtonpost.com/obituaries/2...
www.washingtonpost.com/obituaries/2...
Reposted by Martin Mašek
Miluju matematické a chemické anekdoty!
Tohle mi trvalo asi 10 sekund, holt hlava už unavená. :o)))
Tohle mi trvalo asi 10 sekund, holt hlava už unavená. :o)))
September 29, 2025 at 10:41 PM
Miluju matematické a chemické anekdoty!
Tohle mi trvalo asi 10 sekund, holt hlava už unavená. :o)))
Tohle mi trvalo asi 10 sekund, holt hlava už unavená. :o)))
Reposted by Martin Mašek
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.
Jean once saved me from pointing the Palomar 200-inch telescope in the wrong direction.
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...
www.latimes.com
September 28, 2025 at 5:53 PM
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.
Jean once saved me from pointing the Palomar 200-inch telescope in the wrong direction.
Reposted by Martin Mašek
Srovnání velikosti prvních tří amerických kosmických lodí. Mercury dole, Gemini uprostřed a nahoře Apollo i s lunárním modulem.
September 25, 2025 at 6:55 PM
Srovnání velikosti prvních tří amerických kosmických lodí. Mercury dole, Gemini uprostřed a nahoře Apollo i s lunárním modulem.
Reposted by Martin Mašek
Podle legendy Navahů, je Átse A ts’oosí (Orion) lovec, který napíná luk, připravený vystřelit šíp. Symbolizuje ochranu. Stojí před dětmi (Dilyéhé - Plejády), a chrání je. Jako by věděl, že i děti tady na zemi (Američané) skutečně potřebují ochranu před zlým - oranžovým - duchem.
September 24, 2025 at 12:35 PM
Podle legendy Navahů, je Átse A ts’oosí (Orion) lovec, který napíná luk, připravený vystřelit šíp. Symbolizuje ochranu. Stojí před dětmi (Dilyéhé - Plejády), a chrání je. Jako by věděl, že i děti tady na zemi (Američané) skutečně potřebují ochranu před zlým - oranžovým - duchem.
Reposted by Martin Mašek
Surprise! A bright new comet is entering darker skies, with a relatively close approach with Earth (~0.25 AU) in October! Read more about this discovery (provisionally designated SWAN25B) in my latest blog post! 😄
#CometWatch #ESA #NASA
#CometWatch #ESA #NASA
A Bright New Comet Discovered in SOHO/SWAN Images!
While comets such as 3I/ATLAS and C/2025 A6 (Lemmon) have currently been our main focus, it turned out that another interesting object — magnitude +7 — was quietly lurking in daylight! Provisionall…
skyhuntblog.wordpress.com
September 14, 2025 at 4:47 PM
Surprise! A bright new comet is entering darker skies, with a relatively close approach with Earth (~0.25 AU) in October! Read more about this discovery (provisionally designated SWAN25B) in my latest blog post! 😄
#CometWatch #ESA #NASA
#CometWatch #ESA #NASA
Reposted by Martin Mašek
Darker skies, meant I could get a much deeper image of the new comet. This is a 5 x 5 degree crop. Sep 14 9hrs UT.
September 15, 2025 at 12:51 PM
Darker skies, meant I could get a much deeper image of the new comet. This is a 5 x 5 degree crop. Sep 14 9hrs UT.
Reposted by Martin Mašek
Here is some more images from Cordoba.
September 11, 2025 at 5:59 AM
Here is some more images from Cordoba.
Reposted by Martin Mašek
#bskycometography no. 282
C/2004 Q2 (Machholz)
2004 Aug 27: Discovered visually by D. E. Machholz (USA) at 11 mag. The comet reached a maximum magnitude of 3-4 mag shortly before perihelion which occurred on 2005 Jan 24 at 1.21 au. It was last seen on 2006 Sep 9.
☄️🔭 #CometWatch
C/2004 Q2 (Machholz)
2004 Aug 27: Discovered visually by D. E. Machholz (USA) at 11 mag. The comet reached a maximum magnitude of 3-4 mag shortly before perihelion which occurred on 2005 Jan 24 at 1.21 au. It was last seen on 2006 Sep 9.
☄️🔭 #CometWatch
August 27, 2025 at 3:28 PM
#bskycometography no. 282
C/2004 Q2 (Machholz)
2004 Aug 27: Discovered visually by D. E. Machholz (USA) at 11 mag. The comet reached a maximum magnitude of 3-4 mag shortly before perihelion which occurred on 2005 Jan 24 at 1.21 au. It was last seen on 2006 Sep 9.
☄️🔭 #CometWatch
C/2004 Q2 (Machholz)
2004 Aug 27: Discovered visually by D. E. Machholz (USA) at 11 mag. The comet reached a maximum magnitude of 3-4 mag shortly before perihelion which occurred on 2005 Jan 24 at 1.21 au. It was last seen on 2006 Sep 9.
☄️🔭 #CometWatch
Reposted by Martin Mašek
#bskycometography no. 276
C/1879 Q1 (Palisa)
1879 Aug 21: Disc by A. Palisa (Croatia) at 7.5 mag. The comet brightened towards perihelion on Oct 5 at 0.99 au. It was last seen on Oct 22.
The comet was NOT found by J. Palisa as it is written almost everywhere, it was his brother!
☄️🔭 #CometWatch
C/1879 Q1 (Palisa)
1879 Aug 21: Disc by A. Palisa (Croatia) at 7.5 mag. The comet brightened towards perihelion on Oct 5 at 0.99 au. It was last seen on Oct 22.
The comet was NOT found by J. Palisa as it is written almost everywhere, it was his brother!
☄️🔭 #CometWatch
August 21, 2025 at 3:30 PM
#bskycometography no. 276
C/1879 Q1 (Palisa)
1879 Aug 21: Disc by A. Palisa (Croatia) at 7.5 mag. The comet brightened towards perihelion on Oct 5 at 0.99 au. It was last seen on Oct 22.
The comet was NOT found by J. Palisa as it is written almost everywhere, it was his brother!
☄️🔭 #CometWatch
C/1879 Q1 (Palisa)
1879 Aug 21: Disc by A. Palisa (Croatia) at 7.5 mag. The comet brightened towards perihelion on Oct 5 at 0.99 au. It was last seen on Oct 22.
The comet was NOT found by J. Palisa as it is written almost everywhere, it was his brother!
☄️🔭 #CometWatch
Reposted by Martin Mašek
Reposted by Martin Mašek
#bskycometography no. 268
C/1987 P1 (Bradfield)
1987 Aug 11: Discovered by comet hunter W. A. Bradfield (Australia) at 9 mag. It reached 5 mag around perihelion (Nov 7 at 0.87 au) and showed a short tail of a few degrees. Last seen on 1988 Apr 13. My first visual comet!
☄️🔭 #CometWatch
C/1987 P1 (Bradfield)
1987 Aug 11: Discovered by comet hunter W. A. Bradfield (Australia) at 9 mag. It reached 5 mag around perihelion (Nov 7 at 0.87 au) and showed a short tail of a few degrees. Last seen on 1988 Apr 13. My first visual comet!
☄️🔭 #CometWatch
August 11, 2025 at 3:03 PM
#bskycometography no. 268
C/1987 P1 (Bradfield)
1987 Aug 11: Discovered by comet hunter W. A. Bradfield (Australia) at 9 mag. It reached 5 mag around perihelion (Nov 7 at 0.87 au) and showed a short tail of a few degrees. Last seen on 1988 Apr 13. My first visual comet!
☄️🔭 #CometWatch
C/1987 P1 (Bradfield)
1987 Aug 11: Discovered by comet hunter W. A. Bradfield (Australia) at 9 mag. It reached 5 mag around perihelion (Nov 7 at 0.87 au) and showed a short tail of a few degrees. Last seen on 1988 Apr 13. My first visual comet!
☄️🔭 #CometWatch
Reposted by Martin Mašek
Americká počítačová vědkyně Margaret Hamilton u palubní desky kosmické lodi Apollo, na jejímž vývoji se podílela.
August 9, 2025 at 8:45 PM
Americká počítačová vědkyně Margaret Hamilton u palubní desky kosmické lodi Apollo, na jejímž vývoji se podílela.
Reposted by Martin Mašek
#bskycometography no. 263
C/1946 P1 (Jones)
1946 Aug 6: Discovered by A. F. A. L. Jones (New Zealand) at 9 mag during variable star observing. It passed perihelion on Oct 26 at 1.14 au and reached 7 mag. It was last seen on 1948 Nov 23. The comet has a period of about 600 years.
☄️🔭 #CometWatch
C/1946 P1 (Jones)
1946 Aug 6: Discovered by A. F. A. L. Jones (New Zealand) at 9 mag during variable star observing. It passed perihelion on Oct 26 at 1.14 au and reached 7 mag. It was last seen on 1948 Nov 23. The comet has a period of about 600 years.
☄️🔭 #CometWatch
August 6, 2025 at 2:47 PM
#bskycometography no. 263
C/1946 P1 (Jones)
1946 Aug 6: Discovered by A. F. A. L. Jones (New Zealand) at 9 mag during variable star observing. It passed perihelion on Oct 26 at 1.14 au and reached 7 mag. It was last seen on 1948 Nov 23. The comet has a period of about 600 years.
☄️🔭 #CometWatch
C/1946 P1 (Jones)
1946 Aug 6: Discovered by A. F. A. L. Jones (New Zealand) at 9 mag during variable star observing. It passed perihelion on Oct 26 at 1.14 au and reached 7 mag. It was last seen on 1948 Nov 23. The comet has a period of about 600 years.
☄️🔭 #CometWatch
Reposted by Martin Mašek
Objevena devátá planeta? Ne, spíš naopak! ❌
1/4 Sociálními sítěmi a některými weby právě koluje senzační zpráva: prý byla objevena devátá planeta Sluneční soustavy.
Tak, a teď se zhluboka nadechněme a zachovejme klid, protože... 👇
1/4 Sociálními sítěmi a některými weby právě koluje senzační zpráva: prý byla objevena devátá planeta Sluneční soustavy.
Tak, a teď se zhluboka nadechněme a zachovejme klid, protože... 👇
August 5, 2025 at 11:06 AM
Objevena devátá planeta? Ne, spíš naopak! ❌
1/4 Sociálními sítěmi a některými weby právě koluje senzační zpráva: prý byla objevena devátá planeta Sluneční soustavy.
Tak, a teď se zhluboka nadechněme a zachovejme klid, protože... 👇
1/4 Sociálními sítěmi a některými weby právě koluje senzační zpráva: prý byla objevena devátá planeta Sluneční soustavy.
Tak, a teď se zhluboka nadechněme a zachovejme klid, protože... 👇
Reposted by Martin Mašek
Ukážu vám něco, co jste ještě nikdy ...
(pokud vám teda není pár miliard let a necestovali jste za mlada na ledový měsíce, když tam probíhal výlevný kryovulkanismus)
... neviděli
Aneb zpráva o našem nejnovějším objevu začíná (doslova) probublávat do světa, tak ať víte první
(pokud vám teda není pár miliard let a necestovali jste za mlada na ledový měsíce, když tam probíhal výlevný kryovulkanismus)
... neviděli
Aneb zpráva o našem nejnovějším objevu začíná (doslova) probublávat do světa, tak ať víte první
July 24, 2025 at 6:51 PM
Ukážu vám něco, co jste ještě nikdy ...
(pokud vám teda není pár miliard let a necestovali jste za mlada na ledový měsíce, když tam probíhal výlevný kryovulkanismus)
... neviděli
Aneb zpráva o našem nejnovějším objevu začíná (doslova) probublávat do světa, tak ať víte první
(pokud vám teda není pár miliard let a necestovali jste za mlada na ledový měsíce, když tam probíhal výlevný kryovulkanismus)
... neviděli
Aneb zpráva o našem nejnovějším objevu začíná (doslova) probublávat do světa, tak ať víte první
Reposted by Martin Mašek
Koukám, že je akce na první, ale i druhý (nenavazující) díl Geostorek. Za 548 Kč tak můžete mít doma obě knížky!
A zatímco tu červenou získáte s mým a Lucii podpisem (pač předobjednávka), nákupem té tyrkysové nám pomůžete překonat metu 10 tisíc kusů!
www.knihydobrovsky.cz/kniha/geosto...
A zatímco tu červenou získáte s mým a Lucii podpisem (pač předobjednávka), nákupem té tyrkysové nám pomůžete překonat metu 10 tisíc kusů!
www.knihydobrovsky.cz/kniha/geosto...
Geostorky aneb Tak bude trochu tepleji... - Petr Brož
Ve volném pokračování Geostorek se tentokrát vydáme po stopách jedné zdánlivě nevinné věty: „No a…
www.knihydobrovsky.cz
July 23, 2025 at 10:55 AM
Koukám, že je akce na první, ale i druhý (nenavazující) díl Geostorek. Za 548 Kč tak můžete mít doma obě knížky!
A zatímco tu červenou získáte s mým a Lucii podpisem (pač předobjednávka), nákupem té tyrkysové nám pomůžete překonat metu 10 tisíc kusů!
www.knihydobrovsky.cz/kniha/geosto...
A zatímco tu červenou získáte s mým a Lucii podpisem (pač předobjednávka), nákupem té tyrkysové nám pomůžete překonat metu 10 tisíc kusů!
www.knihydobrovsky.cz/kniha/geosto...
Reposted by Martin Mašek
Průměrná roční teplota v ČR překonala hranici:
+8 °C v roce 1983*
+9 °C v roce 2000
+10 °C v roce 2024
Od roku 1961 stoupla průměrná roční teplota ČR o +2,3 °C.
*V letech 1967 & 1975 dosáhla průměrná roční teplota ČR přesně 8 °C.
+8 °C v roce 1983*
+9 °C v roce 2000
+10 °C v roce 2024
Od roku 1961 stoupla průměrná roční teplota ČR o +2,3 °C.
*V letech 1967 & 1975 dosáhla průměrná roční teplota ČR přesně 8 °C.
July 12, 2025 at 9:14 AM
Průměrná roční teplota v ČR překonala hranici:
+8 °C v roce 1983*
+9 °C v roce 2000
+10 °C v roce 2024
Od roku 1961 stoupla průměrná roční teplota ČR o +2,3 °C.
*V letech 1967 & 1975 dosáhla průměrná roční teplota ČR přesně 8 °C.
+8 °C v roce 1983*
+9 °C v roce 2000
+10 °C v roce 2024
Od roku 1961 stoupla průměrná roční teplota ČR o +2,3 °C.
*V letech 1967 & 1975 dosáhla průměrná roční teplota ČR přesně 8 °C.