Mastodawn

18. Feb. 1930: Clyde Tombaugh entdeckt den #Pluto am Lowell-Observatorium in Arizona. Am 24.08.2006 definierte die #IAU den bis dahin neunten Planeten als #Zwergplanet.

Jeroen Bosman Feb 3

Happy to see the statement on #universityrankings by the International Association of Universities #IAU, the largest and most international university network: https://iau.global/news/iau-note-on-rankings-released. Sort of proud to have played a role in that. Moving away from rankings, step by step. I look forward to seeing similar statements from #LERU, #TheGuild, #AURORA, #YERUN and others. Solidarity among institutions is crucial amidst authoritarianism and commercial capture.

IAU Note on Rankings Released — International Association of Universities

This note, written by an expert group and approved by the IAU Adminsitrative Board, is in Support of the Report of the UNU-Convened Independent Expert Group on Global University Rankings

International Association of Universities

Dr. John Barentine FRAS Jan 13

"The mean apparent magnitude of Amazon Leo #satellites is 6.28 based on 1,938 observations. For spacecraft in their operational mode, 92% exceeded the brightness limit recommended by the #IAU for interference with research, while 25% distract from aesthetic appreciation of the night sky. The reflective characteristics are similar to Version 1 #Starlink spacecraft."

https://arxiv.org/abs/2601.07708

#Space #Astronomy

Brightness Characterization and Modeling for Amazon Leo Satellites

The mean apparent magnitude of Amazon Leo satellites is 6.28 based on 1,938 observations. For spacecraft in their operational mode, 92% exceeded the brightness limit recommended by the IAU for interference with research, while 25% distract from aesthetic appreciation of the night sky. The reflective characteristics are similar to Version 1 Starlink spacecraft.

arXiv.org

Charles J Gervasi ⚡🛡️🥥Dec 15

Silver and Gold, #SLV and #IAU...
https://youtu.be/JrpLh7N67m0?si=uyw3kUq1uwPmg3Oe

EduINAF Dec 3

Con gli occhi al cielo, dall’Italia al Sahara

https://edu.inaf.it/news/eventi/report/rete-saharawi-italia-inaf/

Le attività astronomiche realizzate durante il programma di accoglienza dei Piccoli Ambasciatori di Pace Saharawi in Italia

#astronomia #IAU #pace #Saharawi

@astronomia @astronomia

Dr. Victoria Grinberg Dec 1

The reason I am in Argentina

More info here: https://congresos.unlp.edu.ar/astralx/

I'm really excited to teach here - I wanted to do one of the capacity building workshops for a while.

#astrodon #XraysAreTheBestRays #iau #cospar #astrophysics

schuh Dec 1

A message from Lidia Oskinova, President of the IAU commission G2 Massive Stars:

"Everybody is welcome to join an on-line seminar on December 1st (Monday!) at 16:00 CET

Title: What Stars Are Made Of: Celebrating One Hundred Years of Cecilia Payne-Gaposchkin's Revolutionary PhD Thesis

Speaker: Floor Broekgaarden (University of California San Diego)

https://rediris.zoom.us/j/6313376939?pwd=akRrd2dmb3dnbDN0MmRCallTTHlLQT09&omn=95383862762

A century ago, Cecilia Payne-Gaposchkin's PhD thesis, Stellar Atmospheres, transformed our understanding of the Universe. Famously described by Otto Struve as "the most brilliant PhD thesis ever written in astronomy", Payne-Gaposchkin's work revealed that stars are composed primarily of hydrogen and helium - an insight that overturned the prevailing belief that stars shared Earth's composition.

We invite you to celebrate the centennial of this landmark achievement and to reflect on the courage, creativity, and intellectual clarity that defined Cecilia's science. [...]"

https://massivestars.org/seminars/#20251201

#IAU #OnlineTalk