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#adityal1

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RTN<p><a href="https://chaos.social/tags/MPS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MPS</span></a>:<br>"<br>Sonnenspäher Aditya-L1: Explosives Debüt im All</p><p>Wenige Monate nach Inbetriebnahme hat die Raumsonde einen Strahlungsausbruch auf der Sonne beobachtet – und in eine kaum erforschte Schicht unseres Sterns geschaut.<br>"<br><a href="https://www.mps.mpg.de/8324776/news_publication_24281363_transferred?c=2728" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">mps.mpg.de/8324776/news_public</span><span class="invisible">ation_24281363_transferred?c=2728</span></a></p><p>28.2.2025</p><p><a href="https://chaos.social/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://chaos.social/tags/Flare" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Flare</span></a> <a href="https://chaos.social/tags/Indien" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Indien</span></a> <a href="https://chaos.social/tags/ISRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ISRO</span></a> <a href="https://chaos.social/tags/Raumfahrt" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Raumfahrt</span></a> <a href="https://chaos.social/tags/Raumsonde" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Raumsonde</span></a> <a href="https://chaos.social/tags/SoLEXS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SoLEXS</span></a> <a href="https://chaos.social/tags/Sonne" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Sonne</span></a> <a href="https://chaos.social/tags/Sonnenatmosph%C3%A4re" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Sonnenatmosphäre</span></a> <a href="https://chaos.social/tags/Sonnensonde" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Sonnensonde</span></a> <a href="https://chaos.social/tags/SpaceFlight" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceFlight</span></a> <a href="https://chaos.social/tags/SUIT" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SUIT</span></a> <a href="https://chaos.social/tags/UV" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>UV</span></a></p>
Ohsin<p>Both Aditya-L1 and Chandrayaan-2 have made observations on recent solar eruptive events and their signatures have been analysed.</p><p><a href="https://www.isro.gov.in/ISROCapturestheSignaturesoftheRecentSolarEruptiveEvents.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">isro.gov.in/ISROCapturestheSig</span><span class="invisible">naturesoftheRecentSolarEruptiveEvents.html</span></a></p><p>On spacecraft impact: </p><p>No significant degradation in the NaVIC service, no major upsets observed in any of the 30 GEO spacecrafts. No single event upsets were seen.</p><p>Momentum Wheel speed deviations seen on some sats.</p><p>Spacecrafts with one-sided panel required frequent momentum dumping.</p><p><a href="https://mastodon.social/tags/ISRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ISRO</span></a> <a href="https://mastodon.social/tags/SolarFlare" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SolarFlare</span></a> <a href="https://mastodon.social/tags/solarstrom" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>solarstrom</span></a> <a href="https://mastodon.social/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://mastodon.social/tags/Chandrayaan2" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Chandrayaan2</span></a></p>
WOMUMP<p>Time-lapse from just now of the GHY-6 ('Merlin') antenna at <a href="https://mastodon.social/tags/Goonhilly" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Goonhilly</span></a> <a href="https://mastodon.social/tags/Cornwall" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cornwall</span></a> slewing to track the spaceborne <a href="https://mastodon.social/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> solar observatory, 1.5 million kilometres sunward.<br>Taken from live status page at <a href="https://status.ghy6.goonhilly.org/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">status.ghy6.goonhilly.org/</span><span class="invisible"></span></a></p>
Revesdespace<p>🛰️☀️ La sonde indienne d’étude du Soleil <a href="https://universeodon.com/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> est arrivée ce 6 janvier au point de Lagrange L1 à 1,5 million de km de la Terre après 126 jours de vol</p>
Glyn Moody<p><a href="https://mastodon.social/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://mastodon.social/tags/India" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>India</span></a>’s solar mission reaches Sun’s orbit - <a href="https://www.theguardian.com/world/2024/jan/06/aditya-l1-india-solar-mission-reaches-suns-orbit" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">theguardian.com/world/2024/jan</span><span class="invisible">/06/aditya-l1-india-solar-mission-reaches-suns-orbit</span></a> "reportedly cost $48m (£38m)" so why hasn't the UK done this? <a href="https://mastodon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://mastodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a></p>
Ohsin<p>"Halo-Orbit Insertion (HOI) of its solar observatory spacecraft, Aditya-L1 was accomplished at 16.00 Hrs (approx) on January 6, 2024 (IST). The final phase of the maneuver involved firing of control engines for a short duration."</p><p><a href="https://www.isro.gov.in/halo-orbit-insertion-adtya-l1.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">isro.gov.in/halo-orbit-inserti</span><span class="invisible">on-adtya-l1.html</span></a></p><p><a href="https://mastodon.social/tags/ISRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ISRO</span></a> <a href="https://mastodon.social/tags/ADITYAL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ADITYAL1</span></a></p>
Revesdespace<p>🛰️☀️ La sonde indienne <a href="https://universeodon.com/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> pour l'étude du <a href="https://universeodon.com/tags/Soleil" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Soleil</span></a> a envoyé ses premières images de notre étoile dans les longueurs d'onde 200-400 nm (proches de l'ultraviolet). Les différents filtres permettent de visualiser la photosphère, les taches solaires, les régions tranquilles du Soleil</p>
Revesdespace<p>🛰️☀️ <a href="https://universeodon.com/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> est désormais vraiment en route vers le point de Lagrange L1 Soleil-Terre ! La manœuvre d'insertion "translagrangienne" du point 1 (TL1I) a été effectuée avec succès.<br>L'observatoire spatial sera placé sur une orbite autour de L1 grâce à une manœuvre après environ 110 jours de croisière</p>
AkaSci 🛰️<p>After 4 orbit-raising maneuvers, the Aditya-L1 solar observatory has finally "slipped the surly bonds of Earth" and is now headed towards its destination, a halo orbit around the Sun-Earth Lagrange point L1.<br>ETA - about 100 days from now.</p><p><a href="https://www.isro.gov.in/Aditya_L1.html" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="">isro.gov.in/Aditya_L1.html</span><span class="invisible"></span></a><br><a href="https://www.unoosa.org/documents/pdf/copuos/stsc/2022/11_INDIA_Item11_Indias_First_Solar_Mission_-_Aditya-L1.pdf" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">unoosa.org/documents/pdf/copuo</span><span class="invisible">s/stsc/2022/11_INDIA_Item11_Indias_First_Solar_Mission_-_Aditya-L1.pdf</span></a><br><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://fosstodon.org/tags/ISRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ISRO</span></a></p>
Revesdespace<p>🛰️☀️ <a href="https://universeodon.com/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> a commencé à collecter des données scientifiques. Les capteurs de l'instrument STEPS ont commencé à mesurer des ions et des électrons suprathermiques et énergétiques à des distances supérieures à 50 000 km de la Terre.<br>Pus d’information : <a href="https://www.isro.gov.in/Aditya_L1_collection_of_scientific_data.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">isro.gov.in/Aditya_L1_collecti</span><span class="invisible">on_of_scientific_data.html</span></a></p>
Revesdespace<p>🛰️☀️ Pour <a href="https://universeodon.com/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a>, la quatrième manœuvre pour échapper à la Terre (EBN#4) a été réalisée avec succès.<br>La nouvelle orbite atteinte est de 256 km x 121973 km.<br>La prochaine manœuvre sera pour l’injection vers le point de Lagrange L1 et aura lieu le 19 septembre 2023</p>
Hari Tulsidas<p>India has launched its first spacecraft to study the Sun and space weather, called Aditya-L1. The spacecraft will orbit a point between the Earth and the Sun, where the gravitational forces are balanced. This will allow it to observe the Sun’s corona, solar flares, and coronal mass ejections, which can affect Earth's communication systems and power grids.</p><p><a href="https://masto.ai/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://masto.ai/tags/Sun" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Sun</span></a> <a href="https://masto.ai/tags/SpaceWeather" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceWeather</span></a></p><p><a href="https://www.smithsonianmag.com/smart-news/india-launches-spacecraft-to-study-the-sun-and-space-weather-180982849/?utm_source=flipboard&amp;utm_content=HariTulsidas%2Fmagazine%2FArchetypes" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">smithsonianmag.com/smart-news/</span><span class="invisible">india-launches-spacecraft-to-study-the-sun-and-space-weather-180982849/?utm_source=flipboard&amp;utm_content=HariTulsidas%2Fmagazine%2FArchetypes</span></a></p>
Daniel Estévez<p>New blog post: Decoding <a href="https://mastodon.social/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a>. A short note about decoding a recording that Jean-Luc Milette made a few days ago. <a href="https://destevez.net/2023/09/decoding-aditya-l1/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">destevez.net/2023/09/decoding-</span><span class="invisible">aditya-l1/</span></a></p>
Hari Tulsidas<p>India has launched a spacecraft to study the Sun, becoming the first Asian country to do so. The spacecraft, named Aditya-L1, will orbit around a point between the Earth and the Sun, where the gravitational forces are balanced. The mission aims to understand the Sun’s dynamics, such as its magnetic field, solar flares, and coronal mass ejections, which can affect the Earth’s climate and communication systems. <a href="https://masto.ai/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://masto.ai/tags/SunMission" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SunMission</span></a> <a href="https://masto.ai/tags/IndiaSpace" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>IndiaSpace</span></a></p><p><a href="https://www.pbs.org/newshour/science/after-successful-moon-landing-india-launches-a-spacecraft-to-study-the-sun?utm_source=flipboard&amp;utm_content=HariTulsidas%2Fmagazine%2FArchetypes" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">pbs.org/newshour/science/after</span><span class="invisible">-successful-moon-landing-india-launches-a-spacecraft-to-study-the-sun?utm_source=flipboard&amp;utm_content=HariTulsidas%2Fmagazine%2FArchetypes</span></a></p>
AkaSci 🛰️<p>The other name we see mentioned often is Aditya-L1 project director Mrs. Nigar Shaji, who heads the project team at ISRO.</p><p><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://fosstodon.org/tags/ISRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ISRO</span></a><br>4/n</p>
AkaSci 🛰️<p>The Lagrange points are named after pioneering mathematician, physicist and astronomer Joseph-Louis Lagrange (Jan 25, 1736 – Apr 10, 1813).</p><p>Lagrange made significant contributions to the fields of analysis, number theory, and classical and celestial mechanics.</p><p>His study of the 3-body problem and Lagrange points is described in this famous 1772 paper “Essai sur le Problème des Trois Corps.”</p><p><a href="https://en.wikipedia.org/wiki/Joseph-Louis_Lagrange" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Joseph-L</span><span class="invisible">ouis_Lagrange</span></a><br><a href="https://cosweb1.fau.edu/~jmirelesjames/StromgrenTranslation.pdf" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">cosweb1.fau.edu/~jmirelesjames</span><span class="invisible">/StromgrenTranslation.pdf</span></a><br><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://fosstodon.org/tags/Lagrange" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Lagrange</span></a><br>8/n</p>
AkaSci 🛰️<p>Objects cannot be placed exactly at L1 as they will drift off after any minor deviations. Hence, they are stationed in orbits around the L1 point, which are more stable, but still require periodic (monthly) small adjustments.</p><p>The math to compute Halo/Lissajous orbits is much more complex.</p><p>Similar calculations/constraints apply to the L2 Lagrange point.</p><p>The graphic below shows the exotic orbits around L2 of a few space telescopes.</p><p><a href="https://en.wikipedia.org/wiki/Halo_orbit" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Halo_orb</span><span class="invisible">it</span></a><br><a href="https://www.esa.int/ESA_Multimedia/Videos/2023/07/Webb_and_Gaia_welcome_Euclid_to_L2" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">esa.int/ESA_Multimedia/Videos/</span><span class="invisible">2023/07/Webb_and_Gaia_welcome_Euclid_to_L2</span></a><br><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a><br>7/n</p>
AkaSci 🛰️<p>Hence, we get<br>G * Ms * m / (R - r)^2 = G * Me * m / r^2 + m * ω^2 * (R - r)</p><p>Simplifying, we get<br>G * Ms / (R - r)^2 - G * Me / r^2 - ω^2 * (R - r) = 0</p><p>One can solve for r iteratively using a spreadsheet or a simple computer program.</p><p>Plugging in –<br>G = 6.674E-20 km^3 / kg / s^2<br>Ms = 1.989E+30 kg<br>Me = 5.9722E+24 kg<br>R = 149,597,870 km<br>ω = 2 * pi / (365.25 * 24 * 3600) radians/sec (that of earth)</p><p>We get r = 1,487,940 km, which is close to the 1,500,000 km value commonly cited.</p><p><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a><br>6/n</p>
AkaSci 🛰️<p>Here is a simple approx. method to compute the distance between L1 and Earth.</p><p>Let’s assume circular orbits.</p><p>At L1, the centrifugal force due the object's orbital motion must balance out the gravitational forces of Earth and the Sun.<br>i.e., Fsun = Fearth + Fc</p><p>Using the notations from the diagram, we have<br>Fsun = G * Ms * m / (R - r)^2 (Newton’s equation, G is the Gravitational constant)<br>Fearth = G * Me * m / r^2<br>Fc = m * ω^2 * (R - r) (ω (omega) is the angular speed in radians/s)</p><p><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a><br>5/n</p>
AkaSci 🛰️<p>How can an object at L1 orbit around the Sun at the same period as Earth (365.25 days)?</p><p>It is well-known that objects closer to the sun have a smaller period. E.g., Venus has an orbital period of 225 days and Mercury 88 days.</p><p>But at L1, the object is under the influence of gravity from both the Sun and the Earth. The net gravitational force towards the Sun is smaller and hence the object can orbit at a lower angular speed and a lower centrifugal force.</p><p><a href="https://fosstodon.org/tags/AdityaL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AdityaL1</span></a> <a href="https://fosstodon.org/tags/LagrangeL1" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>LagrangeL1</span></a><br>4/n</p>
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