Paul Leyland

@brnikat.bsky.social

628

Posts

General purpose scientist, amateur astronomer. Aspie into most anything technical.

Pedantry is something up with which I will always put.

Down, not across.

http://astropalma.com

Posts Replies Media

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Paul Leyland

One for 🔭☀️

Google Solar Cycle xkcd.com/2930

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Paul Leyland

Earlier this year, the ROLSES experiment took a unique radio "selfie" of Earth. It shows all the radio emissions from our planet at once -- including narrow-band, pulsed signals indicating the presence of intelligent life. www.inverse.com/science/firs... 🧪

🔭 Any astropy photometrists here who could point a newbie to docs, especially tutorials, on PSF-fitting photometry in Python? Already found photutils.readthedocs.io/en/stable/ps... Now using IRAF DAOPHOT but it's clunky & passed EOL years ago. astropy has lots of good stuff but is very confusing!

PSF Photometry (photutils.psf) — photutils 1.13.0photutils.readthedocs.io

🔭 Saturn's rings are almost edge on. A consequence is that the glare close to the planet is greatly reduced. Herschel discovered Mimas in 1789. Dollfus discovered Janus in 1966. Epimetheus was then confused with Janus. I urge imagers to try for those 3 at this apparition. I'm going to try.

🔭 This is NGC 2623, a magnitude 13.4, SABcd LINER galaxy seen face on. Taken with my 0.4m Dilworth, 3180s unfiltered, in 106 subs on 2023-03-10. The object close to the nucleus is another galaxy. Limiting stellar magnitude is ~20.4, not much brighter than the DSS2 images available at Aladin.

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Paul Leyland

Las estrellas seguirán dibujando su camino, al igual que el agua dibuja los ríos, y las noches... Las noches seguirán siendo mágicas..💫🪄 📸🌿📷 #photography #astrophotography #startrails #nightscape #nature #landscape #Pirineos #Pyrenees

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Paul Leyland

Surprising Phosphate Finding in NASA’s OSIRIS-REx Asteroid Sample An early analysis of the Bennu sample, published June 26 in Meteoritics & Planetary Science, demonstrates that excitement about the sample was warranted. astrobiology.arizona.edu/news/surpris...

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Paul Leyland

Hey! Sunday nite will mark 20yrs since Cassini's arrival at Saturn & the start of the most magnificent exploration (outside Voyager) our species has ever undertaken! I have a *big* post planned for the occasion. Please subscribe to carolynporco.substack.com & remember w/ me the glory of it all!🪐

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Paul Leyland

If we ever find this squiggly line, it will be one of the greatest discoveries in the history of exploration. It's the spectral signal of a habitable, truly Earthlike planet. Spotting it won't be easy, but the JWST observatory is looking now. blogs.nasa.gov/webb/2024/06... 🔭🧪

🔭 ESO 456-78 is a fairly bright (mag 11) globular cluster in Sagitarrius lying in dense star clouds. In this image taken with my 0.4m Dilworth, the dense nucleus of the GC is the circular smudge to left of centre. Its other members are all over the image and some are beyond its boundaries.

🔭 (55565) 2002 AW197 is a V=20.0 TNO 44.9 AU away in March 2023 when this 5460s stack was taken with a SX814 on my 0.4m Dilworth. Noise reduction by FABADA and contrast stretching by ds9 and ImgeMagick. Some sky noise is still visible because the TNO is only half as bright as the background sky.

Here are seven globular clusters orbiting the Triangulum galaxy, aka Messier 33. They are 18th and 19th magnitude. 1350s unfiltered SX 814 camera, 0.4m Dilworth telescope. Taken 2022-09-05

🔭 This is Palomar 5, a faint and sparse globular cluster in Serpens. It was first thought to be a dwarf spheroidal galaxy and was catalogued as UGC 9792. A number of much brighter stars lie in front of the GC. 2760s in 47 subs unfiltered SX814 on a 0.4m Dilworth.

Uh-oh ... www.bbc.co.uk/news/article...

Cyber attack on London hospitals impacts operationswww.bbc.co.uk Urgent and emergency care at the hospitals may not be able to access quick-turnaround blood test results.

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Paul Leyland

Pinus canariensis woodlands, a paradise for fire ecologists! Photo 9 mo postfire #IFPuntagorda La Palma, Canary Is On P canariensis - jgpausas.blogs.uv.es/2017/11/23/p... - jgpausas.blogs.uv.es/2017/05/07/p... - jgpausas.blogs.uv.es/2017/09/22/p... www.sciencedirect.com/science/arti... 🧪🌍🌿🌾wildfire

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🔭Spectacular image of Jupiter’s moon Io from the LBT. news.berkeley.edu/2024/05/30/w...

With new, sharper optics, Arizona telescope captures rare images of Jupiter's moon Io - Berkeley Newsnews.berkeley.edu Large Binocular Telescope's observations of eruptions on volcanically active moon rival those from space

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Paul Leyland

More streetlights to be turned off or dimmed. Excellent. 🔭 🧪 www.bbc.co.uk/news/article...

More Cornwall streetlights to be turned off or dimmed at nightwww.bbc.co.uk Lights in Carbis Bay, St Columb Major, St Neot and Treverbyn Parish to be turned off or dimmed.

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Paul Leyland

Still surprised how anti-science and conservative so many people who are into #astrophotography are--a hobby that's extremely science-adjacent and shows the wonders of the universe and you'd think would lead to an open mind.

🔭 Here is comet 29P/Schwassmann-Wachmann as it appeared on 2023-01-14. Not entirely sure why it wasn't posted much earlier. Exposure of 930 seconds (31x30s subs) through a Johnson V filter, SX 814 camera on a 0.4m Dilworth.

🔭 From ATel 16635 The giant sunspot AR 3664 released in May 2024 many X-class flares and several Coronal Mass Ejections (CME), and it turned again visible (renamed AR 3697) after a solar rotation, with increasing activity. 1/3

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Paul Leyland

phys.org/news/2024-05... Wow, this seems like an interesting technology! 🔭

Researchers create dispersion-assisted photodetector to decipher high-dimensional lightphys.org A new study published in Nature, conducted by an international collaboration team led by Prof. Wei Li from the Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) of the Chinese Academy ...

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🔭🧪

A cylindrical azimut sundial, made out of a Pringles box. Read solar time on the edge of the shadow, where it crosses the date line. Hour line « 12 » to be oriented westward. #Python script. Just customize latitude and diameter before printing. www.astrolabe-science.fr/cadran-cylin...

🔭 The aurora was seen as far south as La Palma, at 28.5N! tvlapalma.com/not/31479/es...

Espectaculares imágenes de la aurora boreal captada anoche desde el @GTCtelescope en el #ORMLaPalma tvlapalma.com

🔭 A thread. On 2024-02-16 I read that the moon was lying close to the Pleiades. I already know that bright stars are easily visible through a telescope as long as they are bright enough and their position known.

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Japan comes face to face with its own space junk. 🔭 🧪 www.bbc.co.uk/news/science...

Japan comes face to face with its own space junkwww.bbc.co.uk A Tokyo company's satellite encounters a big lump of space debris high above the Earth.

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I may have posted these in the 🔭 feed before, but it still blows my mind that these two mountains are the same height above the photographer's sea/mean-surface level, and the same distance from the respective cameras.

Wow! www.bbc.co.uk/news/world-m...

Gulf flooding: Dubai airport chaos as UAE and Oman reel from deadly stormswww.bbc.co.uk Heavy rain batters the UAE and Oman, causing flash floods that have killed 20 people since Sunday.

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Paul Leyland

From Skylar Grayson: The Hubble Tension is one of the great mysteries of modern cosmology…can today’s paper help us solve it? 🔭✨️ astrobites.org/2024/04/16/t...

A New H0pe for the Hubble Constant?astrobites.org The Hubble Tension is one of the great mysteries of modern cosmology…can today’s paper help us solve it?

What does "brigading" mean in this context? Is it an American usage?

Men. The app is Ovia. Do the thing.

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Paul Leyland

Reply to

Michael Merrifield

OK, I think it might be analogous to how spiral arms in galaxies form :-) For fluctuations in bag check rate, there is an asymmetry. Imagine that at the beginning, there is no queue, and passengers are arriving at a constant rate. The first fluctuation "bag check takes longer than necessary for 1/