Créer un compteSe connecter

Recherches récentes

Aucune recherche récente

Options de recherche

Disponible uniquement lorsque vous êtes connecté.
mastouille.fr est l'un des nombreux serveurs Mastodon indépendants que vous pouvez utiliser pour participer au fédiverse.
Mastouille est une instance Mastodon durable, ouverte, et hébergée en France.

Administré par :

Statistiques du serveur :

591
comptes actifs

mastouille.fr: À proposAnnuaire des profilsPolitique de confidentialité

Mastodon: À proposTélécharger l’applicationRaccourcis clavierVoir le code sourcev4.3.4

#astronomer

1 message1 participant0 message aujourd’hui
Public
AllanICarswellObservatory
Happy Space Science Saturday! Did you know that today Saturn begins its retrograde motion? Normally, Saturn moves eastward against the background of stars, but during retrograde it appears to pivot and move westward through the constellations. This apparent backward motion isn’t because Saturn actually reverses its orbit, but rather because of Earth’s own motion around the Sun. As Earth passes Saturn in its orbit, our changing perspective makes Saturn appear to move backward in the night sky.


#Orbit #Retrograde #Saturn #SpaceExploration #Space #Astronomer #Astronomy #SpaceScienceSaturday #YorkU #Observatory #AllanICarswellObservatory #Stargazing #YorkUniverse #Telescope #Planets #Stars #Science #Physics #Toronto #YorkUObservatory #AICO #Cosmos #LearnAstronomy #SpaceFacts
#spacefacts
Public
Ele Willoughby, PhD

Happy birthday to #astronomer Henrietta Swan Leavitt (1868-1921) who set the scale of our Universe. My portrait of Leavitt is printed in silvery lavender ink on Japanese kozo (or mulberry paper). Behind her is a line showing stellar luminosity (capital L with subscript sun-symbol, a circle with a dot) as a function of time (t). She is printed over constellations in gold (Cepheus, Cassiopeia, Draco, 🧵

My linocut portrait of Henrietta Swan Leavitt is printed in silvery lavender ink on Japanese kozo (or mulberry paper). Behind her is a line showing stellar luminosity (capital L with subscript sun-symbol, a circle with a dot) as a function of time (t). She is printed over constellations in gold (Cepheus, Cassiopeia, Draco, Ursa Minor and Andromeda). ⁠ ⁠
#linocut#printmaking#WomenInSTEM
Public
Dr. Alexandre Santerne 🌍

Hello #FediScience, migrating from astrodon.social (about to close), I am joining you here (inspired by @wolfgangcramer), so it's time for a new #Introduction

I'm Alexandre Santerne (call me Alex), #astronomer working @LAM_Marseille & teaching at Aix-Marseille #University (France).

I'm expert in finding #NoPlanetB 😀 (#planets around other #stars).

I want to work in a #fair, #inclusive, and #sustainable #research #environment, so I (try to) act accordingly. I'm a member of @labos1point5

I toot a lot about #Astronomy, #Astrophysics, #Space but also a lot about #ClimateChange and #Climate.

Since 2019, I completely boycott planes, and I travel by #train (long distance) and #bike (short distance) as much as I can.

My other interests include #photography (visit my Flickr gallery in my profile) #Astronomy #Space

Oh, in case you don't know where Aix-Marseille is (trick: in 🇫🇷 ), the image below (credit: #NASA / JPL-Caltech / Space Science Institute) is indicating where I am, as seen from #Saturn...

... and where you also are, together with 8B people as part of 2M species 😀

This rare image taken on July 19, 2013, by NASA's Cassini spacecraft has shows Saturn's rings and our planet Earth and its moon in the same frame. At the time, Cassini was 2013 from a distance of about 898.414 million miles (1.445858 billion kilometers) from Earth. It is only one footprint in a mosaic of 33 footprints covering the entire Saturn ring system (including Saturn itself) taken by Cassini's wide-angle camera. (Image credit: NASA/JPL-Caltech/Space Science Institute)
Public *
Ele Willoughby, PhD

Happy birthday to Caroline Herschel (1750 – 1848) a trail blazing woman in #astronomy. Hers was a real life Cinderella story, where rather than marrying a prince, she made a life and career for herself. Marriage her expected role but she was deemed unmarriageable, since a childhood bout of typhus stunted her growth. Her mother thought she should train to be a servant, & purposely stood in the way of her learning French, or music,🧵

Linocut portrait of Caroline Herschel against a starry sky with comet and 5 inset diagrams of her observations
#printmaking#sciart#WomenInSTEM
Public
AllanICarswellObservatory
Get your resumes ready! Killarney Parks and the Allan I. Carswell Observatory present the Astronomer in Residence program, an astronomy outreach endeavour!
This is an exciting chance to share your love of astronomy in the wonderful outdoors of the dark sky site at Killarney Provincial Park. Be a part of live, in-person tours as well as remote events, and share your adventures on the Astronomer in Residence Blog.
Perks: Limited stipends available ($400/week). Be sure to note in your application if this is a limiting factor!
Applications open soon!

#AstronomyOutreach #DarkSkySite #Killarney #AstronomerInResidence #AllanICarswellObservatory #YorkU #Toronto #Ontario #Astronomy #Astronomer #Science #Astrophotography
#astrophotography
Public
AllanICarswellObservatory
Happy Space Science Sunday! Did you know that Voyager 1 is the first man-made object to travel past the heliosphere, a protective area of magnetic energy and particles generated by the Sun. It crossed this boundary into interstellar space in 2012. Miraculously, the spacecraft, which launched in 1977, is still sending data back to Earth. While there have been some technical difficulties, like communication issues and power limitations due to the decay of its radioactive power source, the team behind Voyager 1 remains committed to maintaining the project and gathering data for as long as possible.
Image Credit: Caltech/NASA-JPL

#Yorku #AllanICarswellObservatory #YorkUObservatory #Astronomy #Astronomer #Space #Voyager1 #Interstellar #SpaceFacts #Science #DeepSpace #Spacecraft
#Spacecraft
Suite du fil
Public *
Space Catitude 🚀

For a periods in the late 80s, early 90s, late 90s, and early 2000s, I was a professional #Astronomer (yet another workstation jockey) with a particular interest in #BioAstronomy -- planets, star forming, potential habitats -- that sort of thing.

Used data-reduction software. And I wrote some in #FORTRAN

Along the way, also learned BASIC, C, C++, Pascal, and then #Python

Helped develop the #NICMOS camera for Hubble. Then got to reduce some data from it to study protostars.

[2/3]

Public
Ele Willoughby, PhD

For #printersolstice prompt gold, my #linocut of Sophie Brahe (1556 or 1559-1643) horticulturalist, astronomer, genealogist, & alchemist with the gardens at her brother #astronomer Tycho Brahe’s Uraniborg estate, where she often assisted his research, alchemical tools & illustrations of the supernova she observed as Tycho’s assistant.

Tycho trained her in horticulture & chemistry but initially discouraged astronomy. 🧵1/n

My 11” x 14” linocut portrait of Sophie Brahe, a Renaissance aristocrat in headgear, ruff, dark clothing with medallion on a wide band and a long scarf or other thin fabric draped over her shoulders with her hands folded in front of her and alchemical vessels, printed in dark bronze ink, on a bronze background. In green behind her head is a map of the gardens at Uranienborg, with her head at the centre of the diamond shaped pale green knot garden (geometric planned gardens). This is surrounded by an orchard in darker green with semicircle bump outs on each side of the diamond. The stars of Cassiopeia from De stelle nova are printed in gold on top of everything; there are stars across her chest and ruff and in the garden and the large supernova is above her head.
#womenInSTEm#histsci#sciart
Public
Ele Willoughby, PhD

Happy birthday to #mathematician & #astronomer Nicole-Reine Lepaute (1723-1788)! My #linocut celebrates her calculated path of the solar eclipse of 1764. She also worked with Alexis Clairaut & Jérôme Lalande to precisely calculate the date of return of Halley’s Comet solving the notorious 3-body by hand (including the gravitational pull of Jupiter & Saturn on orbit). They worked in parallel, calculating for 6 months straight barely stopping🧵

My linocut print of mathematician & astronomer Nicole-Reine Lepaute (1723-1788) in a vertical gradient (bottom to top) of bright pink to lavender on white paper. She wears a wig and gown and the portrait is from the chest to head. Her 12 diagrams of the phases of the annular the solar eclipse of 1764 as viewed from Paris appear across her shoulders. Behind her head in green is her map of the path of the eclipse across Europe.
#printmaking#womeninSTEM#histsci
Suite du fil
Public
Ele Willoughby, PhD

in particular).

A career civil servant in Nanyang, Heng was also an #astronomer, #mathematician, #seismologist, hydraulic engineer, #inventor, geographer, cartographer, ethnographer, artist, #poet, philosopher, politician & literary scholar. He was a bit of a controversial figure politically, sparing over calendar reform & with rivals amongst the palace eunuchs. But both his poetry & famous inventions are still remembered. He also improved the Chinese approximation for pi & 🧵2/n

Public
Ele Willoughby, PhD

Day 11 #ArtAdventCalendar: Happy birthday to trailblazing US #astronomer Annie Jump Cannon (1863 – 1941), here with her stellar classification system which sorted stars based on spectral types, revealing their temperature from hot blue to cool red stars: O,B,A, F, G, K & M. Named the Harvard Classification after the university, her tremendous contribution was less visible.
🧵1/n

My linocut of Annie Jump Cannon shows her in a 3/4 profile view wearing a shirt with a lace collar and her hair up. She is printed in a gradient of violet at the bottom to green at the top, printed on white 11” x 14” paper. The background is printed in a gradient (left to right) of dark blue, light blue, yellow, pale yellow, pale orange, orange and red. The background block excludes her silhouette of shoulder and head with the exception of a smattering of small dots in a swath from upper left to lower right (which extends to white spots on the coloured background). Also along the bottom are a series of circles of decreasing size (left to right, blue through red) labelled O, B, A, F, G, K, M. There’s a axis line along the bottom with 6 tick marks. Vertically from top to bottom along the left side are 15-, 10-, 5-, 0, 5, 20, 15.
#printmaking#womenInSTEM#histsci
Public
Ele Willoughby, PhD

For the #Spacetober prompt orbit: my portrait of #mathematician and #astronomer Johannes Kepler (1571-1630)! We remember him for his role in the Scientific Revolution, and his three laws of planetary motion in particular. His laws modified Copernicus’ heliocentric model; he replaced the circular orbits with elliptical ones & described velocities of planets. Today we know them as:
🧵1/n

#sciart #histsci #MastoArt #Kepler #geometry #PlatonicSolids #mathematics #musicOfTheSpheres #linocut

My linocut portrait of Johannes Kepler on cream coloured washi paper. Kepler is in Renaissance garb printed in indigo. He holds a compass and rests his hand on his model of nested Platonic solids from Mysterium Cosmographicum, printed in gold ink. Above that in silver in are 7 musical staves with notes next to symbols for related planetary bodies: Mercury, Venus, Earth and Moon, Mars, Jupiter and Saturn. Over his other shoulder are 3 schematic diagrams drawn in ellipses (oriented with the semi-major axes horizontal) in magenta. The top one relates to his first law and shows an ellipse cut in two horizontally, the two foci labelled F and F’ and a triangle drawn to a point P on the ellipse (FPF’). The middle ellipse (2nd law) shows the Sun at a focus, and a series of circles on the ellipse as a planet such that the sections are equal area and alternate colouring (magenta or none) like a peppermint. The bottom ellipse (3rd law) is cut in half with semi-major and semi-minor axes shown
Public
Ele Willoughby, PhD

For the #Spacetober day 11 prompt wavelength: my #linocut of trailblazing US #astronomer Annie Jump Cannon (1863 – 1941) with her stellar classification system which sorted stars based on spectral types, revealing their temperature from hot blue to cool red stars: O,B,A, F, G, K & M. Named the Harvard Classification after the university, her tremendous contribution was less visible. 🧵1/n

My linocut of Annie Jump Cannon shows her in a 3/4 profile view wearing a shirt with a lace collar and her hair up. She is printed in a gradient of violet at the bottom to green at the top, printed on white 11” x 14” paper. The background is printed in a gradient (left to right) of dark blue, light blue, yellow, pale yellow, pale orange, orange and red. The background block excludes her silhouette of shoulder and head with the exception of a smattering of small dots in a swath from upper left to lower right (which extends to white spots on the coloured background). Also along the bottom are a series of circles of decreasing size (left to right, blue through red) labelled O, B, A, F, G, K, M. There’s a axis line along the bottom with 6 tick marks. Vertically from top to bottom along the left side are 15-, 10-, 5-, 0, 5, 20, 15.
#printmaking#womenInSTEM#histsci
Public
Ele Willoughby, PhD

For the #Spacetober day 7 prompt sun: #astrophysicist Cecilia Payne-Gaposchkin (1900-1979), who discovered that hydrogen & helium are the most common elements in sun & stars & hence the universe.⁠
⁠
Born England, she won a scholarship to Newnham College at Cambridge in 1919 where she heard a lecture which changed her life. She wrote, “My world had been so shaken that I experienced something very like a 🧵1/
⁠
#linocut #physics #sciart #printmaking #womenInSTEM #MastoArt #astrophysics #astronomer

My linocut portrait of Cecilia Payne-Gaposchkin in a lace collar in front of the sun in oranges and black against the blackness of space. At the bottom of the print is the solar absorption spectrum (a rainbow style gradient of indigo at left through to red and black at the right with specific discrete thin black vertical lines at various places).
Public
Ele Willoughby, PhD

For the #SciArtSeptember prompt hidden: #astronomer Vera Rubin (neé Cooper, ‘28-‘16) & her discovery that angular motion of galaxies deviates from predictions, 1st evidence for dark matter, now known as 5x as common as matter & the stuff which dictates dynamics of galaxies & evolution of our universe! The Nobel committee waited 3 years after she died to reward another for the theory of dark matter.

🧵1/n
#MastoArt
#printmaking #sciart #linocut #womenInSTEM

My linocut portrait of astronomer Vera Rubin with short hair, glasses and resting her face in her hand in burgundy on a background of outer space with stars and galaxies in black with blue and pink splotches to mimic how dust bends light in space. At the base of the print is a large spiral galaxy with a plot of orbital velocity versus distance going out from its centre (so the distance axis is indeed distance from centre). There are two lines labelled “observed” which goes up from the origin and then is a pretty flat wavy line all the way across. This line marks the bottom of Rubin. Below it is a wide empty gap of visible white paper down to the second line labelled “predicted”. The Predicted line goes up from the origin to a peak where it diverges from the observed and falls smoothly back down in a gentle curve.
Public
mythologyandhistory

Did you know that yet another #woman was being overlooked for her work?

Cecilia Payne-Gaposchkin wrote her doctoral #thesis on the distribution of elements in stars.

Science thought that there wasn't a significant difference in elemental composition between the earth & stars but Payne realised that hydrogen made up the bulk of stars.

Fellow #astronomer Henry Russell dismissed her... Until 4 yrs later, when he took her conclusion & barely mentioned her. He's credited with the idea.

#history
ExplorerFlux en direct
À propos