Esther Hanko
@oetie.nl
Glamateurastronoom 💅 | Moestuinmiep | Outreachcoördinator @uva_api
| Raar kattenvrouwtje | @[email protected] | blog: oetie.nl
| Raar kattenvrouwtje | @[email protected] | blog: oetie.nl
Pinned
Esther Hanko
@oetie.nl
· Nov 30
Foto van Jupiter van gisteravond vanuit de voortuin in Purmerend. 🔭📷
Reposted by Esther Hanko
Did you know that there is a lunar crater named after Anton Pannekoek? It's at the far side of the moon so we can't see it through a telescope from earth. This photo was taken by the Lunar Reconnaisance Orbiter. What's your favourite lunar feature? 🌔🔭
January 8, 2026 at 9:55 AM
Did you know that there is a lunar crater named after Anton Pannekoek? It's at the far side of the moon so we can't see it through a telescope from earth. This photo was taken by the Lunar Reconnaisance Orbiter. What's your favourite lunar feature? 🌔🔭
Bijzondere kleurkeuze.
Is it your duty towards society to have children? Clear geographical patterns here.
January 7, 2026 at 2:36 PM
Bijzondere kleurkeuze.
Reposted by Esther Hanko
#OnThisDay in 1610, Galileo Galilei recorded the first mention of Jupiter's moons. At first thinking them to be fixed stars near the gas giant, his later observations revealed them to be orbiting Jupiter. Io, Europa, Ganymede and Callisto are now known as the Galilean moons. #HistoryOfScience
January 7, 2026 at 10:35 AM
#OnThisDay in 1610, Galileo Galilei recorded the first mention of Jupiter's moons. At first thinking them to be fixed stars near the gas giant, his later observations revealed them to be orbiting Jupiter. Io, Europa, Ganymede and Callisto are now known as the Galilean moons. #HistoryOfScience
Reposted by Esther Hanko
Work! Our lovely institute (@api.uva.nl) is looking for a new Institute Manager - so if you fancy trying to make sense of the mysteries of university project budgets, and herding a bunch of mostly well-behaved astronomer-cats, JOIN US!!!
werkenbij.uva.nl/vacatures/in...
werkenbij.uva.nl/vacatures/in...
Vacature — Instituutsmanager Anton Pannekoek Instituut voor Sterrenkunde
<p>Voel jij je thuis in de universitaire wereld en houd je van uitdagingen op het gebied van bedrijfsvoering? Wie weet ben jij dan onze nieuwe instituutsmanager!</p>
werkenbij.uva.nl
December 18, 2025 at 10:19 AM
Work! Our lovely institute (@api.uva.nl) is looking for a new Institute Manager - so if you fancy trying to make sense of the mysteries of university project budgets, and herding a bunch of mostly well-behaved astronomer-cats, JOIN US!!!
werkenbij.uva.nl/vacatures/in...
werkenbij.uva.nl/vacatures/in...
Reposted by Esther Hanko
We're hiring! The GRAPPA center (a collaboration between the UvA's IoP and API) is looking for an assistant/associate professor in the area of gravitational-wave and multi-messenger astrophysics. Please see below for full vacancy.
werkenbij.uva.nl/en/vacancies...
werkenbij.uva.nl/en/vacancies...
Vacancy — Faculty position in GRAPPA Center of Excellence
<p>Do you enjoy working in an interdisciplinary research setting and do you want to be active in the area of gravitational-wave and multi-messenger astrophysics? The Gravitation and Astroparticle Physics Amsterdam (<a href="https://www.grappa.amsterdam/">GRAPPA</a>) Centre of Excellence at The University of Amsterdam is seeking to hire one assistant/associate professor. We are especially interested in candidates that can strengthen our connection to current and future gravitational-wave, neutrino, and electromagnetic observatories. We have a strong preference for a staff member who enhances the diversity of our staff and will prioritize applicants from members of underrepresented groups.</p>
werkenbij.uva.nl
January 7, 2026 at 11:07 AM
We're hiring! The GRAPPA center (a collaboration between the UvA's IoP and API) is looking for an assistant/associate professor in the area of gravitational-wave and multi-messenger astrophysics. Please see below for full vacancy.
werkenbij.uva.nl/en/vacancies...
werkenbij.uva.nl/en/vacancies...
Reposted by Esther Hanko
With warnings in place for some potential heavy snow in parts of the Midlands and Southern UK on Thursday, we may have some chances to photograph #snowflakes up close. I made a video tutorial on simple #Macro #SnowflakePhotography 4yrs ago; you can watch it here: tinyurl.com/6n6nzc4v
January 6, 2026 at 6:17 PM
With warnings in place for some potential heavy snow in parts of the Midlands and Southern UK on Thursday, we may have some chances to photograph #snowflakes up close. I made a video tutorial on simple #Macro #SnowflakePhotography 4yrs ago; you can watch it here: tinyurl.com/6n6nzc4v
Reposted by Esther Hanko
Happy new year! My all sky camera imaged the sky every 15 seconds and this picture shows what happened in the sky in 2025. It shows the length of the night and day with the hourglass shape, the monthly lunar cycle with the diagonal bands, the elevation of the Sun at local noon, and lots of clouds.
January 1, 2026 at 8:54 PM
Happy new year! My all sky camera imaged the sky every 15 seconds and this picture shows what happened in the sky in 2025. It shows the length of the night and day with the hourglass shape, the monthly lunar cycle with the diagonal bands, the elevation of the Sun at local noon, and lots of clouds.
Reposted by Esther Hanko
UK amateur astronomers!🪐🔭Are you concerned about light pollution? I'm on the Commission for Dark Skies (British Astronomical Association) – we're inviting amateur astronomers in the UK to join our 2026 campaign against light pollution! Sign up here & please share: docs.google.com/forms/d/e/1F...
Campaign For Dark Skies (CFDS) Network
By completing this form you are consenting to your information being stored in our database. Your data will not be shared with anyone else. A link will be sent to you regarding zoom meetings as well a...
docs.google.com
January 5, 2026 at 10:50 AM
UK amateur astronomers!🪐🔭Are you concerned about light pollution? I'm on the Commission for Dark Skies (British Astronomical Association) – we're inviting amateur astronomers in the UK to join our 2026 campaign against light pollution! Sign up here & please share: docs.google.com/forms/d/e/1F...
Reposted by Esther Hanko
A year ago, I went to Copenhagen to write about the political crisis sparked by Trump over Greenland. Danes told me that the US can already do whatever it wants on the island.
Their conclusion: Trump just wants the U.S. to look larger on a map
www.theatlantic.com/internationa...
Their conclusion: Trump just wants the U.S. to look larger on a map
www.theatlantic.com/internationa...
Trump Triggers a Crisis in Denmark—And Europe
"Trump might forget about Greenland. But also, he might not. Nobody knows. He operates on whims," @anneapplebaum writes.
www.theatlantic.com
January 5, 2026 at 7:48 AM
A year ago, I went to Copenhagen to write about the political crisis sparked by Trump over Greenland. Danes told me that the US can already do whatever it wants on the island.
Their conclusion: Trump just wants the U.S. to look larger on a map
www.theatlantic.com/internationa...
Their conclusion: Trump just wants the U.S. to look larger on a map
www.theatlantic.com/internationa...
Reposted by Esther Hanko
Belangrijk draadje over #Venezuela en de zogenaamde #neutraliteit van de @nieuws.nos.nl. Door vooral officiële bronnen te gebruiken, zijn ze juist niet neutraal maar versterken ze de macht. Een doodzonde voor een #journalistiek medium.
Het feit dat Maduro geen goede leider is (voor zover er iets bestaat als 'goede leiders') is geen geheim. Hij is niet links, hij is geen democraat.
Dat is echter geen relevante vraag op dit moment. De relevante vraag is of de ingreep van de VS legitiem is.
interregnum.ghost.io/nicolas-madu...
Dat is echter geen relevante vraag op dit moment. De relevante vraag is of de ingreep van de VS legitiem is.
interregnum.ghost.io/nicolas-madu...
Nicolás Maduro is No Ally of the Left: Here’s Why
With tensions between the United States and Venezuela at an historic high, Johann de Haas analyses the Maduro regime's iron grip on power, and highlights that opposition to imperialism should not enta...
interregnum.ghost.io
January 3, 2026 at 5:40 PM
Belangrijk draadje over #Venezuela en de zogenaamde #neutraliteit van de @nieuws.nos.nl. Door vooral officiële bronnen te gebruiken, zijn ze juist niet neutraal maar versterken ze de macht. Een doodzonde voor een #journalistiek medium.
Reposted by Esther Hanko
Some planetary nebulae images I processed over the years:
NGC 7094, NGC 2371, NGC 4071. #PlanetaryNebulae
NGC 7094, NGC 2371, NGC 4071. #PlanetaryNebulae
January 3, 2026 at 4:52 PM
Some planetary nebulae images I processed over the years:
NGC 7094, NGC 2371, NGC 4071. #PlanetaryNebulae
NGC 7094, NGC 2371, NGC 4071. #PlanetaryNebulae
Of een zwaartekrachtgolf natuurlijk
Dit klinkt als een gebruikersnaam van iemand die echt veel te laat is met het aanmaken van een gebruikersnaam.
December 12, 2025 at 11:36 AM
Of een zwaartekrachtgolf natuurlijk
Reposted by Esther Hanko
Talk by Dame Jocelyn Bell Burnell at 7.30pm tonight. It will be streamed live on YouTube. #astronomy
www.youtube.com/watch?v=WTWJ...
www.youtube.com/watch?v=WTWJ...
Bursts, bangs and things that go bump in the night
YouTube video by Astronomical Society of Edinburgh
www.youtube.com
December 5, 2025 at 4:06 PM
Talk by Dame Jocelyn Bell Burnell at 7.30pm tonight. It will be streamed live on YouTube. #astronomy
www.youtube.com/watch?v=WTWJ...
www.youtube.com/watch?v=WTWJ...
Reposted by Esther Hanko
Nederland staat voor een fundamentele keuze in digitaal beleid: AI als doel op zich of ten dienste van samenleving. Oproep van Roel Dobbe, Daniel Mügge en Marleen Stikker waag.org/nl/article/v...
Waag | Verantwoorde en duurzame digitalisering in plaats van nauwe AI focus
De AI-economie moet in dienst staan van de Nederlandse maatschappij, niet andersom. Marleen Stikker, Roel Dobbe en Daniel Mügge leggen uit hoe en geven speerpunten voor de formatie.
waag.org
December 1, 2025 at 1:49 PM
Nederland staat voor een fundamentele keuze in digitaal beleid: AI als doel op zich of ten dienste van samenleving. Oproep van Roel Dobbe, Daniel Mügge en Marleen Stikker waag.org/nl/article/v...
Reposted by Esther Hanko
Une autre Jupiter du 21 mais la nuit d'avant. Conditions rock'n roll. Appréciez la pénombre autour de l'ombre de Ganymède.
November 23, 2025 at 12:38 PM
Une autre Jupiter du 21 mais la nuit d'avant. Conditions rock'n roll. Appréciez la pénombre autour de l'ombre de Ganymède.
nos.nl/artikel/2591...
"Bedrijven in Nederland kunnen helemaal niet vergroenen vanwege netcongestie."
Oh ja nee ja daar kan de politiek inderdaad HELEMAAL NIETS AAN DOEN. Die hoogspanningsmasten zijn ook op magische wijze verschenen indertijd.
"Bedrijven in Nederland kunnen helemaal niet vergroenen vanwege netcongestie."
Oh ja nee ja daar kan de politiek inderdaad HELEMAAL NIETS AAN DOEN. Die hoogspanningsmasten zijn ook op magische wijze verschenen indertijd.
Nederland organiseert met Colombia top over afbouwen 'fossiel', BBB niet blij
Het plan werd bekendgemaakt door minister Sophie Hermans (Klimaat en Groene Groei) op de klimaattop in Brazilië.
nos.nl
November 21, 2025 at 2:43 PM
nos.nl/artikel/2591...
"Bedrijven in Nederland kunnen helemaal niet vergroenen vanwege netcongestie."
Oh ja nee ja daar kan de politiek inderdaad HELEMAAL NIETS AAN DOEN. Die hoogspanningsmasten zijn ook op magische wijze verschenen indertijd.
"Bedrijven in Nederland kunnen helemaal niet vergroenen vanwege netcongestie."
Oh ja nee ja daar kan de politiek inderdaad HELEMAAL NIETS AAN DOEN. Die hoogspanningsmasten zijn ook op magische wijze verschenen indertijd.
Reposted by Esther Hanko
Grizzly reminds - one must STRETCH
further wellness checks:
did you hydrate?
take meds?
had a food?
paused in doomscrolling to attempt to tickle a stretching cat's belly on your screen?
squee at something cute?
found a smidge of joy in our current hellscape?
further wellness checks:
did you hydrate?
take meds?
had a food?
paused in doomscrolling to attempt to tickle a stretching cat's belly on your screen?
squee at something cute?
found a smidge of joy in our current hellscape?
November 15, 2025 at 7:55 PM
Grizzly reminds - one must STRETCH
further wellness checks:
did you hydrate?
take meds?
had a food?
paused in doomscrolling to attempt to tickle a stretching cat's belly on your screen?
squee at something cute?
found a smidge of joy in our current hellscape?
further wellness checks:
did you hydrate?
take meds?
had a food?
paused in doomscrolling to attempt to tickle a stretching cat's belly on your screen?
squee at something cute?
found a smidge of joy in our current hellscape?
Reposted by Esther Hanko
🚀 As we wait for the next CME — and maybe more aurora action — here’s a look at what’s racing toward Earth! ⚡️ This eruption and CME blasted out with yesterday’s X5.2 flare, complete with a powerful shock and particles hitting the cameras. Fingers crossed 🤞 and skies clear! 🌌
bit.ly/sunactivity
bit.ly/sunactivity
November 12, 2025 at 8:03 PM
🚀 As we wait for the next CME — and maybe more aurora action — here’s a look at what’s racing toward Earth! ⚡️ This eruption and CME blasted out with yesterday’s X5.2 flare, complete with a powerful shock and particles hitting the cameras. Fingers crossed 🤞 and skies clear! 🌌
bit.ly/sunactivity
bit.ly/sunactivity
Reposted by Esther Hanko
Looks like Bz is northwards (although decreasing) so we may be in for disappointment tonight unless the situation changes. The weather is awful here and I have a 6am flight so I am signing off for tonight 🌧️👋
November 12, 2025 at 11:06 PM
Looks like Bz is northwards (although decreasing) so we may be in for disappointment tonight unless the situation changes. The weather is awful here and I have a 6am flight so I am signing off for tonight 🌧️👋
Reposted by Esther Hanko
We have upgraded our geomagnetic forecast today (12 November 2025) to the highest intensity level amid an ongoing solar storm.
Current predictions suggest that the activity will result in potentially the largest solar storm to hit our planet in over two decades.
Current predictions suggest that the activity will result in potentially the largest solar storm to hit our planet in over two decades.
November 12, 2025 at 2:55 PM
We have upgraded our geomagnetic forecast today (12 November 2025) to the highest intensity level amid an ongoing solar storm.
Current predictions suggest that the activity will result in potentially the largest solar storm to hit our planet in over two decades.
Current predictions suggest that the activity will result in potentially the largest solar storm to hit our planet in over two decades.
Reposted by Esther Hanko
There is now a G5 (extreme) geomagnetic storm watch in place (Met Office), we are waiting for the third eruption to arrive although, due to uncertainty in the propagation models it is unclear whether it will arrive today or tomorrow 🌞💨🌎👀 #SpaceWeather #Aurora #StephsStormWatch
November 12, 2025 at 12:33 PM
There is now a G5 (extreme) geomagnetic storm watch in place (Met Office), we are waiting for the third eruption to arrive although, due to uncertainty in the propagation models it is unclear whether it will arrive today or tomorrow 🌞💨🌎👀 #SpaceWeather #Aurora #StephsStormWatch
Reposted by Esther Hanko
In 1892 E.E. Barnard discovered Jupiter's 5th moon, Amalthea, the last moon found by eye through a telescope. Over the next 80 years photos were B&W, and improved only a little over the period.
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
November 12, 2025 at 7:19 AM
In 1892 E.E. Barnard discovered Jupiter's 5th moon, Amalthea, the last moon found by eye through a telescope. Over the next 80 years photos were B&W, and improved only a little over the period.
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
1891 Lick Obs-36" refractor, E.E. Barnard
1950 Mt Palomar-200" reflector, M.L. Humason
#AstroHistory
Reposted by Esther Hanko
Saturn on Saturday evening using the Celestron C11 at prime focus, with a Uranus-C camera.
Seeing wasn't great and I struggled to get decent data using a Barlow.
6 images derotated in winjupos.
🔭
Seeing wasn't great and I struggled to get decent data using a Barlow.
6 images derotated in winjupos.
🔭
November 10, 2025 at 4:56 PM
Saturn on Saturday evening using the Celestron C11 at prime focus, with a Uranus-C camera.
Seeing wasn't great and I struggled to get decent data using a Barlow.
6 images derotated in winjupos.
🔭
Seeing wasn't great and I struggled to get decent data using a Barlow.
6 images derotated in winjupos.
🔭
Reposted by Esther Hanko
Here is the latest SWPC graphic regarding the recent X1.2 flare from AR 4274. Again, X-flares are not unusual around solar maximum, and Earth-directed CMEs of this caliber are not "dangerous." This is not a Carrington-class event by ANY means.
November 10, 2025 at 12:51 PM
Here is the latest SWPC graphic regarding the recent X1.2 flare from AR 4274. Again, X-flares are not unusual around solar maximum, and Earth-directed CMEs of this caliber are not "dangerous." This is not a Carrington-class event by ANY means.