#VariableStar
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localgroupjp.bsky.social
かんむり座T星、いまだ静かです。
www.ananscience.jp/variablestar...
光度曲線と集計表 – 日本変光星研究会
www.ananscience.jp
September 1, 2024 at 2:22 PM
skyandtelescope.bsky.social
One of the brightest Cepheid variable stars in the sky is . . . Eta Aquilae! Never heard of it? It's located 8° due south of Altair and pulses from magnitude 4.3 to 3.4 and back every 7.18 days.
skyandtelescope.org/astronomy-ne...
.
.
#astrononmy #aquila #stargazing #variablestar #cepheid
July 30, 2025 at 1:18 PM
localgroupjp.bsky.social
かんむり座T星、過去2回の増光が知られ、増光すると2～3等級に達しています。
過去の増光では、開始から半日で最も明るくなり、それから1週間で6等まで暗くなり、1カ月で元の明るさに戻ります。
本当に増光したなら今晩(2025年9月5日の夜)が最も明るくなっていそうです。
www.ananscience.jp/variablestar...
かんむり座T星について – 日本変光星研究会
www.ananscience.jp
September 5, 2025 at 4:16 AM
localgroupjp.bsky.social
Seestar S50をつかった、かんむり座T星観測キャンペーンがスタート。

Seestarで撮影し、フリーソフトで測光、キャンペーンページに報告します。
観測から報告の手順と、そもそも新星とはなにかについて下記キャンペーンページで詳しく説明されています。
www.ananscience.jp/variablestar...
反復新星かんむり座T星の爆発を監視しよう！ – 日本変光星研究会
www.ananscience.jp
May 18, 2024 at 10:34 PM
nasapodsky.bsky.social
Astronomy Picture from 21/02/2007

Mira Over Germany

Source: https://apod.nasa.gov/apod/ap070221.htm<a href="/hashtag/Mira" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#Mira #VariableStara#RedGiantR#NightSkyN#Astronomys#Stargazinga#Cetusg#Stuttgartt#Germany##Spacey#Cosmologyo#Starsy #Stars
A nighttime long exposure photograph shows the variable star Mira near its maximum brightness, magnitude 2, above a castle in Stuttgart, Germany. Mira, a red giant star near the end of its life, is roughly the same mass as our Sun but far more luminous. Its atmosphere extends beyond the orbit of Mars. Mira's brightness varies significantly throughout the year.
March 8, 2025 at 12:19 PM
nasapodsky.bsky.social
Astronomy Picture from 21/02/2007

Mira Over Germany

Source: https://apod.nasa.gov/apod/ap070221.htm<a href="/hashtag/Mira" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#Mira #VariableStara#RedGiantR#Astronomys#NightSkyN#Starsy#Cetuss#Stuttgartt#Germany##Spacey#Cosmologyo#AstroPhotographyt#DeepSky#DeepSky
Nighttime long exposure photograph of Mira, a variable red giant star near its peak brightness, in the constellation Cetus, over a castle in Stuttgart, Germany. Mira's brightness varies dramatically over a year, making it appear as a "new" star at times. This image shows Mira at magnitude 2. The star is nearing the end of its life and is over 10,000 times more luminous than our Sun.
March 29, 2025 at 1:19 PM
timeline-cleanse.bsky.social
By: hubblespacetelescope

https://hubblesite.org/home
https://unsplash.com/photos/a-star-cluster-in-the-middle-of-a-night-sky-jjPJYxZtzJc

#nebula #outerSpace #cosmic #cosmos #variableStar #star #reflectionNebula #nova #redSupergiantStar #v838Monocerotis #hubbleTelescope #hubble #nasa
Light Echoes From Red Supergiant Star V838 Monocerotis - October 2004 Credits NASA, ESA and H.E. Bond (STScI)
December 8, 2024 at 11:00 PM
nasapodsky.bsky.social
Astronomy Picture from 03/10/2002

V838 Mon: Mystery Star

Source: https://apod.nasa.gov/apod/ap021003.htm<a href="/hashtag/V838Monocerotis" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#V838Monocerotiso#MysteriousStari#LightEchoi#StellarEvolutionv#Astronomys#Spacey#Astrophysicso#VariableStara#Nebula #Cosmologyosmology
Two images of V838 Monocerotis, a variable star, taken in May and September 2002 by the South African Astronomical Observatory. The images show the star's dramatic transformation and the expansion of its surrounding light echo nebula. The nebula is a result of light reflecting off shells of material ejected by the star, offering a glimpse into its history. The star's behavior defies conventional understanding of stellar life cycles.
March 24, 2025 at 2:59 AM
kazufukuda.bsky.social
20260720-205357 JST
・測光結果： 9.47
・測光誤差： 0.11
Seestar tri-color G channel

マカリィとdigphot4で測光して報告もしてみた。
www.ananscience.jp/variablestar...
#TCrB
July 20, 2026 at 3:23 PM
kazufukuda.bsky.social
ちなみにかんむり座T星はこんな星です。
およそ80年周期で爆発を起こして明るくなりますが、そろそろ明るくなってもいいんじゃないかと注目を集めています。
（とはいえ過去3回の観測からの約80年周期なので）
www.ananscience.jp/variablestar...
www.ananscience.jp
July 20, 2026 at 3:32 PM
astronomybot.bsky.social
...e observed variations. #StarSystem #ExoplanetSearch #VariableStar #BrightnessVariations #CelestialBody #Astronomy #PlanetarySystem

December 28, 2024 at 4:00 AM
particlewa.bsky.social
The Betelgeuse star now has a friend. Read the full story here: particle.scitech.org.au/space/astron...

#Betelgeuse #companionstar #variablestar
Astronomers said 'Betelgeuse Betelgeuse Betelgeuse' and a new star appeared! | Particle
‘Astronomers find a new star’ might not sound like the most exciting headline ever, but trust me on this one.
particle.scitech.org.au
August 12, 2025 at 12:23 AM
nasapodsky.bsky.social
Astronomy Picture from 11/10/1998

Resolving Mira

Source: https://apod.nasa.gov/apod/ap981011.htm<a href="/hashtag/Mira" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#Mira #RedGiantR#VariableStara#HubbleSpaceTelescopee#Astronomys#Astrophysicso#Starss#Spaces#Cosmologyosmology
Hubble Space Telescope image of Mira, a red giant star 700 times larger than our sun, showing its pulsating surface and a mysterious extended feature. Discovered 401 years ago, Mira is one of only a few stars to have its surface resolved. The extended feature may be due to gravitational perturbation or heating from its white dwarf companion.
June 10, 2025 at 6:22 AM
nasapodsky.bsky.social
Astronomy Picture from 08/11/2017

NGC 2261: Hubble's Variable Nebula

Source: https://apod.nasa.gov/apod/ap171108.htm<a href="/hashtag/HubbleVariableNebula" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link">#HubbleVariableNebulal#NGC2261##ReflectionNebulao#RMonocerotiso#SpaceTelescopee#Astrophysicso#Cosmologyo#Astronomys#VariableStara#Nebulas##DeepSpacee#Spacee#UniverseUniverse
Stunning Hubble Space Telescope image of Hubble's Variable Nebula (NGC 2261), a reflection nebula in Monoceros. Its appearance changes over weeks due to opaque dust clouds orbiting the central star R Monocerotis, casting shifting shadows. The nebula is approximately one light-year across and located about 2500 light-years away.
February 19, 2025 at 6:19 AM