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#stars

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Mikko Tuomi

In the next few months, from its perch atop a mountain in Chile, the Vera C. Rubin Observatory will begin surveying the #cosmos with the largest camera ever built.

Every three nights, it will produce a map of the entire southern sky filled with #stars, #galaxies, #asteroids and @supernovae — and swarms of bright #satellites ruining some of the view.

Swarms of satellites are harming #astronomy.

Here’s how researchers are fighting back.

nature.com/articles/d41586-025

www.nature.comSwarms of satellites are harming astronomy. Here’s how researchers are fighting backSpaceX and other companies plan to launch tens of thousands of satellites, which could mar astronomical observations and pollute the atmosphere.
Public
Mikko Tuomi

Small #planets have nearly circular orbits, while giant planets have orbits about four times more elliptical.

The finding points toward two different pathways by which large and small planets form.

The #eccentricity split coincides with several other iconic features in the #exoplanet population, such as the high abundance of small planets over large planets and a tendency for giant planets to form only around #stars enriched in heavy elements.

#astronomy #exoplanets
astrobiology.com/2025/03/small

Astrobiology · Small And Large Planets Have Significantly Different Upbringings - AstrobiologyThe shape of a planet’s orbit is one of its fundamental properties, along with its size and distance from its host star.
Public
Mikko Tuomi

First first-author paper by my PhD researcher Andras Haris. Not formally accepted yet, but major hurdles cleared.

He has analysed 3273 space telescope #transit light curves of 99 #planets, and identified 105 candidates for #starspot occultation events by six planets.

Homogeneous search for spot transits in #Kepler and #TESS photometry of K − M-type main-sequence #stars

#astronomy #astrophysics
arxiv.org/abs/2502.18129

arXiv logo
arXiv.orgHomogeneous search for spot transits in Kepler and TESS photometry of K $-$ M-type main-sequence starsLate-type stars are known to host numerous exoplanets, and their photometric variability, primarily caused by rotational modulation, provides a unique opportunity to study starspots. As exoplanets transit in front of their host stars, they may occult darker, spotted regions on the stellar surfaces. The monitoring of starspots from planetary transits, known as transit mapping, offers a possibility to detect small dark regions on magnetically active, late-type stars. These spots may be so small that they would be undetectable to other methods used to reconstruct stellar magnetic activity. We describe a Bayesian analysis framework on the transit light curves of planets orbiting K- and M-type main-sequence stars in search for spot occultation event candidates. We present a systematic analysis of high-precision, high-cadence light curves from Kepler and TESS to detect and characterise starspots during exoplanetary transits. According to our tests, the set of criteria applied in the analysis is robust and not prone to false positives. Our sample comprises K- and M-dwarfs hosting transiting exoplanets observed by the Kepler or TESS space telescopes at a high cadence, totalling 99 planets meeting our selection criteria. After analysing 3273 transit light curves from 99 planets, we find 105 candidates for starspot occultation events by six planets. We report new spot occultation candidates for the K-dwarfs HD 189733 and TOI-1268. The identified dark regions have a lower limit for radii between 1.6 degrees and 29.5 degrees and contrasts up to 0.69. We estimate a spot detection frequency of 3.7% and 4.2% for K- and M-dwarfs by TESS, and 37.5% for K-dwarfs by Kepler.
Public
David de Groot 📸

Guess who forgot to pack their tripod and ultra-wide lens?

So this is two 35mm shots with the camera balanced on a stool, held up on an angle with my phone (on its side) and the phone stand for the higher angle, then stitched in Lightroom.

Not great by any means, but who can resist a bit of milky way when you're in a dark area?

Part of the Milky Way, with the Southern Cross towards the bottom above the trees,.
#night#sky#stars
Public
Mikko Tuomi

Astronomers gauge livability of #exoplanets orbiting white dwarf #stars.

Comparison of a hypothetical white dwarf that’s passed through much of its life cycle and Kepler-62, a main sequence #star at a similar phase in its evolution as our sun reveals that prospects for habitability might be better around the white dwarf.

The white dwarf #exoplanet could be much warmer than the Kepler-62 exoplanet despite analogous stellar energy distribution.

#astronomy
news.uci.edu/2025/02/13/uc-irv

Public
Mikko Tuomi

This image from #JWST shows a portion of the Leo P dwarf #galaxy (stars at lower right represented in blue), a star-forming galaxy about 5 million light-years away.

Astronomers collected data from about 15 000 #stars in Leo P to deduce its #star formation history.

It went through three phases: an initial burst of star formation, a pause that lasted several billion years, and then a new round of star formation that is still continuing.

#astronomy #astrophotography
stsci.edu/contents/media/image

The image from Webb’s NIRCam (Near-Infrared Camera) combines infrared light at wavelengths of 0.9 microns (represented in blue), 1.5 microns (green), and 2.77 microns (red). The stars in Leo P appear blue in comparison to the background galaxies for several reasons. Young, massive stars that are common in star-forming galaxies are predominantly blue. Leo P also is extremely lacking in elements heavier than hydrogen and helium, and the resulting “metal-poor” stars tend to be bluer than Sun-like stars. A bubble-like structure at bottom center is a region of ionized hydrogen surrounding a hot, massive O-type star.
Public
Mikko Tuomi

Astronomers have imaged a large number of exocomet belts around nearby #stars, and the tiny pebbles within them.

The crystal-clear images show light being emitted from these millimetre-sized pebbles within the belts that orbit 74 nearby stars of a wide variety of ages – from those that are just emerging to those in more mature systems like our own Solar System.

#astronomy
ast.cam.ac.uk/news/scientists-

www.ast.cam.ac.ukScientists reveal structure of 74 exocomet belts orbiting nearby stars | Institute of AstronomyAn international team of astrophysicists has imaged a large number of exocomet belts around nearby stars, and the tiny pebbles within them.
Public
NASA

Webb Watches Carbon-Rich Dust Shells Form, Expand in Star System science.nasa.gov/missions/webb #NASA #Astrophysics #BinaryStars #GoddardSpaceFlightCenter #JamesWebbSpaceTelescopeJWST #Nebulae #ScienceResearch #Stars #TheMilkyWay #TheUniverse

A portion of Webb’s 2023 observation of Wolf-Rayet 140. A bright white hexagon is toward the bottom left-center. This is the two stars. Blue diffraction spikes point diagonally toward 8, 11, and 1 o’clock. Surrounding the central light are a series of regularly spaced rings. A segment of each of the rings at around 2 o’clock appears brighter. These bright patches form a line that travels to the upper right. A few blue background dots are on the black background of space.
science.nasa.govWebb Watches Carbon-Rich Dust Shells Form, Expand in Star System - NASA ScienceAstronomers have long tried to track down how elements like carbon, which is essential for life, become widely distributed across the universe. Now, NASA’s James Webb Space Telescope has examined one ongoing source of carbon-rich dust in our own Milky Way galaxy in greater detail: Wolf-Rayet 140, a system of two massive stars that follow […]
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Krononaut Moon 🌕 2025 Mar 14

Monday is January's #FullMoon — the #WolfMoon.

It's now exactly 2 #lunar cycles to the #TotalLunarEclipse on 2025 Mar 14, the Night of the #KrononautMoon, and our invitation to #TimeTravelers to come visit or send us a #quantum #signal. (To be followed by 2 more Total Lunar Eclipses in the next year!)

Here's our extended version #Checklist for the Night of the Krononaut Moon, a celebration of Time Travel. (Original post located here: me.dm/@KronoMoon/1136102025338).

☑️ Coming our way next on 2025 Mar 14 #UTC 07:00, 2 months from now.

☑️ #Observe the #Moon & #stars that night, wherever & however you like, with friends & colleagues or on your own. Local #times flexible.

☑️ #Connect with the #cosmos & with your #past & #future #selves. Send a #signal to #beings in the #future(s). #Candles & safe #campfires are good; #music & #dancing are good; #radio #wave #antennas are good. Be experimental!

☑️ Click & share many #photos of the #Moon, with you (and your #family / #pets) under it — what we call a #Moonsie — and any nearby #UFOs. Share your #images with @KronoMoon & @KronoMoonPhotos.

☑️ #Enjoy a deepened #moment of #peace, #love, #authenticity & #meaning, with other #Mastodonians around the #world & #beyond — wherever you are.

📽️ svs.gsfc.nasa.gov/4155/

WikiCommons animated image of a Total Lunar Eclipse that took place on 2014 Apr 15. We wonder how many #UFOs / #UAP were spotted that night? The Full Moon floats in from upper right, then goes through lighting changes in deep red tints, and emerges at lower left with its original coloration. According to the graphic, the process took a couple hours. Image dated 2014 Mar 31. Credits: Goddard Multimedia / NASA's Scientific Visualization Studio https://svs.gsfc.nasa.gov/4155/ https://commons.wikimedia.org/wiki/File:LRO_and_the_Lunar_Eclipse_of_April_15,_2014_-_Shadow_View.ogv
#Time#Timelessnes#TimeTravel
Public
DimaLink

Atomic Herzog – at the rooftop of your house!

And this is my drawing based on Duke Nukem Episode 1 Shrapnel City (MsDos). It is appeared some slimes at the rooftops of the buildings. And by night, some UFO is landing every night at the rooftop. And some strange insects to appear. Which can climb at the craters.

#pixelart#digitalart#2dgame
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