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Eric Bellm

@ebellm

Astronomer at the University of Washington. Building time-domain surveys (ZTF & Rubin Observatory) & looking for compact objects in our Galaxy.

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12.10.2023
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Latest posts by Eric Bellm @ebellm

It's only COSPAR if it's from the General Assembly region, otherwise it's just sparkling IAU

08.03.2026 23:09 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
The author in a high-viz vest standing outside in front of the Rubin Observatory

The author in a high-viz vest standing outside in front of the Rubin Observatory

Oh hi, @vrubinobs.bsky.social! Looking good! πŸ”­

08.03.2026 13:22 πŸ‘ 21 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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a despicable me character is standing in front of a full moon ALT: a despicable me character is standing in front of a full moon
03.03.2026 05:48 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Everyone can come after me: switching is fine. Getting up in the dark in the winter would suck, but so would summer sunrises at 4am.

stat-us quo! stat-us quo!

03.03.2026 01:52 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Words fail me.

28.02.2026 06:55 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

This should be well received.

28.02.2026 06:36 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

knee deep in the hoopla

28.02.2026 00:50 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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White House stalls release of approved US science budgets The US Congress rejected sweeping cuts to science agencies. But the NIH, the NSF and NASA have had their spending slowed.

Congress rejected massive cuts to US science budgets for 2026, but much of the money still isn’t flowing to researchers.

The culprit? The White House Office of Management and Budget (OMB) is quietly slow-walking the release of funds. πŸ§΅πŸ‘‡

27.02.2026 16:06 πŸ‘ 1055 πŸ” 711 πŸ’¬ 20 πŸ“Œ 75
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Rubin Observatory has started paging astronomers 800,000 times a night Asteroids, exploding stars, and feasting black holes swarm in the first-ever batch of nightly alerts from the Vera C. Rubin Observatory in Chile

Rubin Observatory has started paging astronomers 800,000 times a night www.scientificamerican.com/article/rubi...

26.02.2026 14:53 πŸ‘ 20 πŸ” 5 πŸ’¬ 2 πŸ“Œ 3

Now that's an evocative way to describe the start of @vrubinobs.bsky.social alerts!

blog.adafruit.com/2026/02/26/t...

26.02.2026 17:55 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Rubin Observatory with open dome under a night sky. Text reads "NSF-DOE Rubin Observatory has released its first world-public alerts. Here's what you need to know. El Observatorio Rubin de NSF-DOE publicΓ³ sus primeras alertas pΓΊblicas a nivel mundial. Esto es lo que necesitas"

Rubin Observatory with open dome under a night sky. Text reads "NSF-DOE Rubin Observatory has released its first world-public alerts. Here's what you need to know. El Observatorio Rubin de NSF-DOE publicΓ³ sus primeras alertas pΓΊblicas a nivel mundial. Esto es lo que necesitas"

Rubin Observatory under a night sky. Text reads "What are alerts? ΒΏQuΓ© son las alertas? Alerts are a "heads up" that something in the sky changed in brightness or position. Las alertas son "avisos" que indican que algo en el cielo cambiΓ³ de brillo o de posiciΓ³n."

Rubin Observatory under a night sky. Text reads "What are alerts? ΒΏQuΓ© son las alertas? Alerts are a "heads up" that something in the sky changed in brightness or position. Las alertas son "avisos" que indican que algo en el cielo cambiΓ³ de brillo o de posiciΓ³n."

Rubin Observatory during an orange sunset.  Text reads "Does an alert mean a new discovery? ΒΏUna alerta significa un nuevo descubrimiento? Not necessarily. An alert flags a change in the sky, which could be either a new discovery or a known object. No necesariamente. Una alerta seΓ±ala un cambio en el cielo, que podrΓ­a tratarse de un nuevo descubrimiento o de un objeto ya conocido."

Rubin Observatory during an orange sunset. Text reads "Does an alert mean a new discovery? ΒΏUna alerta significa un nuevo descubrimiento? Not necessarily. An alert flags a change in the sky, which could be either a new discovery or a known object. No necesariamente. Una alerta seΓ±ala un cambio en el cielo, que podrΓ­a tratarse de un nuevo descubrimiento o de un objeto ya conocido."

Rubin Observatory under a night sky during a long exposure shot, causing the stars to streak. Text reads "Why are these first alerts such a big deal? ΒΏPor quΓ© son tan importantes estas primeras alertas? Rubin is now a real-time discovery machine, enabling scientists worldwide to follow up within minutes! Rubin es ahora una mΓ‘quina de descubrimientos en tiempo real, que permite a cientΓ­ficos de todo el mundo hacer seguimientos en cuestiΓ³n de minutos."

Rubin Observatory under a night sky during a long exposure shot, causing the stars to streak. Text reads "Why are these first alerts such a big deal? ΒΏPor quΓ© son tan importantes estas primeras alertas? Rubin is now a real-time discovery machine, enabling scientists worldwide to follow up within minutes! Rubin es ahora una mΓ‘quina de descubrimientos en tiempo real, que permite a cientΓ­ficos de todo el mundo hacer seguimientos en cuestiΓ³n de minutos."

NSF–DOE Rubin Observatory has officially started releasing world-public alerts! πŸŽ‰

Here's what you need to know about these first alerts and what's coming up for Rubin ➑️

πŸ”­πŸ§ͺβ˜„οΈ

26.02.2026 16:25 πŸ‘ 50 πŸ” 18 πŸ’¬ 1 πŸ“Œ 1
A graphic showing the Rubin Observatory as a white observatory building on a dark hilltop. The night sky is in the background, with data alerts dotted across the sky.

A graphic showing the Rubin Observatory as a white observatory building on a dark hilltop. The night sky is in the background, with data alerts dotted across the sky.

Hunting down supernovae in near real time! Last night, the UK data broker Lasair ingested and rapidly processed 800,000 alerts as the @vrubinobs.bsky.social public alerts stream began! Now anyone can observe astronomical events as they unfold thanks to Rubin’s data brokers. What a milestone! πŸ”­

25.02.2026 18:15 πŸ‘ 53 πŸ” 11 πŸ’¬ 3 πŸ“Œ 4

Who needs doomscrolling when you can have Rubin alerts going off 10x a second all night long?

25.02.2026 18:31 πŸ‘ 10 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Rubin Observatory launches real-time monitoring of the sky with thousands of alerts The Vera C. Rubin Observatory has issued its first real-time alerts of changes in the night sky. The ultrafast alerting system, developed at the UW, will eventually detect up to seven million changes....

SO excited to see the first alerts from @vrubinobs.bsky.social being broadcast to the world last night. A huge congratulations to @ebellm.bsky.social and the Alert Pipeline + Data Management teams here at @dirac-institute.bsky.social for their years of hard work!
www.washington.edu/news/2026/02...

25.02.2026 18:45 πŸ‘ 13 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0

Here we go…the marvellous Vera Rubin Observatory has started scanning the sky, telling us about things that change and move. In there there are untold wonders and undoubtedly a few surprises. Let’s go!

25.02.2026 18:34 πŸ‘ 53 πŸ” 8 πŸ’¬ 0 πŸ“Œ 0
Illustrated graphic with the boot-shaped Rubin Observatory atop its site on Cerro PachΓ³n beneath a sparkling night sky and the glowing band of the Milky Way stretching from lower left to upper right. Sprinkled throughout are many "Data alert!" popups, labeled with icons that represent supernovae, asteroids, hungry black holes, and more.

Illustrated graphic with the boot-shaped Rubin Observatory atop its site on Cerro PachΓ³n beneath a sparkling night sky and the glowing band of the Milky Way stretching from lower left to upper right. Sprinkled throughout are many "Data alert!" popups, labeled with icons that represent supernovae, asteroids, hungry black holes, and more.

A 3-by-4 grid of grayscale astronomical images zoomed in on single objects. From left to right, the columns are labeled Template, New image, and difference. From top to bottom, the rows are labeled supernova, variable star, active galactic nucleus, and solar system object.

A 3-by-4 grid of grayscale astronomical images zoomed in on single objects. From left to right, the columns are labeled Template, New image, and difference. From top to bottom, the rows are labeled supernova, variable star, active galactic nucleus, and solar system object.

The largest spot-the-difference effort EVER has begun!🚨

On the night of Feb 24, NSF–DOE Rubin Observatory officially released its first ~800,000 public alerts of detected changes in the night sky!πŸ”

A new era of discovery is here✨ πŸ”­πŸ§ͺβ˜„οΈ

πŸ”—: rubinobservatory.org/news/first-a...

25.02.2026 18:10 πŸ‘ 183 πŸ” 68 πŸ’¬ 4 πŸ“Œ 20

Time for another Decadal πŸ™ƒ

23.02.2026 00:39 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Acme Weather App - App Store Download Acme Weather by Acme Weather on the App Store. See screenshots, ratings and reviews, user tips, and more apps like Acme Weather.

The guys who created Dark Sky and later sold it to Apple are back and have a new weather app out!

apps.apple.com/us/app/acme-we...

21.02.2026 03:30 πŸ‘ 81 πŸ” 21 πŸ’¬ 11 πŸ“Œ 10

We just had three straight weeks when one or the other kid was home with the flu. Thankfully they've gotten better, just in time for midwinter break!

18.02.2026 04:52 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

brave move to choose the window

18.02.2026 01:53 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Personally, I'm just happy to see someone in the central admin with a pulse.

16.02.2026 06:28 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

πŸ”­ I was disappointed to learn that NASA won't archive @ojastro.bsky.social publications on PubSpace because the journal is not listed in Sherpa Romeo (openpolicyfinder.jisc.ac.uk)

14.02.2026 02:44 πŸ‘ 2 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
box and whiskers plots of Physics PhD salaries in the private sector and academia, from aip.org/statistics

box and whiskers plots of Physics PhD salaries in the private sector and academia, from aip.org/statistics

Getting rich isn't necessary: given academic salaries, the excess provided by median private sector wages would be enough to employ one (or more) postdocs...

www.aip.org/statistics/s...

14.02.2026 01:51 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

πŸ”­ I've defaulted to skepticism about the utility of LLMs for new science results. But particle theorists used GPT-5.2 to conjecture and then prove a general formula for gluon scattering amplitudes: arxiv.org/pdf/2602.12176

More from OpenAI here: openai.com/index/new-re...

14.02.2026 01:41 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

... plus Intro to Linguistics, The Book of Job and the Joban Tradition, The Rise and Fall of the Russian Avant Garde, Introduction to Drama, and a double major in physics & astrophysics

Man, I miss college!

31.01.2026 05:03 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Tell me five classes you took in college:

Justice
Human Sexuality
Classics of Christian Literature
Self and Identity
Reason and Religion

31.01.2026 05:03 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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300 Club - Wikipedia

The 300 club: en.wikipedia.org/wiki/300_Club

28.01.2026 04:50 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

s/1/! πŸ™„

24.01.2026 01:01 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

πŸ”­ Congrats to the Scialog awardees! Looking forward to seeing some exciting @vrubinobs.bsky.social science very soon1

23.01.2026 20:58 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Post image

7. Troublemaker, by El Lissitzky, 1913

20.01.2026 03:42 πŸ‘ 1944 πŸ” 349 πŸ’¬ 11 πŸ“Œ 26