🚀 Space Pulse · 2026-08-20 22:02 UTC
SPACE PULSE
Thursday, August 20, 2026 | 22:00 UTC
⚡ TL;DR
ESO astronomers have confirmed S301, the Milky Way's fastest known star, orbiting Sgr A* at 25,000 km/s and feeling the black hole's spin — the biggest astrophysics result of the day. [1]
A solar M8.1 flare, a fresh Type II radio burst, active launch preps, and a packed arXiv make this a dense, high-energy 24 hours. [2] [3] [4]
🚀 LAUNCHES
UPCOMING — CHANG'E 7 | Long March 5, CASC — Window opens August 24 UTC; the mission includes an orbiter, lander, mini-hopping probe, and rover targeting the Moon's South Pole region. [5]
UPCOMING — LONG MARCH 6C | Unknown Payload, CASC — Scheduled August 25 at 03:20 UTC; payload details remain undisclosed. [6]
UPCOMING — FALCON 9 BLOCK 5 | Starlink Group 10-49, SpaceX — Go for Launch August 25 at 05:49 UTC, carrying a batch of 29 Starlink broadband satellites. [7]
UPCOMING — MTG-I2 | Ariane 6, ESA/Eumetsat — Pre-launch media briefing held August 19; liftoff from Kourou set for August 27, delivering the next Meteosat Third Generation Imager. [8]
UPCOMING — ESA FLEX | Kourou — ESA's Fluorescence Explorer satellite has been fuelled at Europe's Spaceport ahead of a planned September 15 launch to monitor global vegetation health. [9]
UPCOMING — JAXA MMX | H3 F10 — JAXA has announced the launch schedule for the Martian Moons eXploration spacecraft aboard H3 Flight No. 10. [10]
UPCOMING — ELECTRON | StriX Launch 11, Rocket Lab — TBD within August 31 window; a synthetic aperture radar satellite for Japanese Earth-imaging firm Synspective.
UPCOMING — ELECTRON | LOXSAT 1, Rocket Lab / Eta Space / NASA — TBD within August 31 window; demonstration of a complete cryogenic oxygen fluid-management system in orbit under NASA's Tipping Point program.
UPCOMING — PALLAS-1 | Demo Flight, Galactic Energy — First test launch of the Pallas-1 rocket, date TBD within August 31 window.
UPCOMING — LONG MARCH 12A | Flight 2, CASC — Second test launch of the Long March 12A vehicle, payload TBD, targeting August 31 window.
🔭 DISCOVERIES
S301 FASTEST MILKY WAY STAR — ESO's Very Large Telescope Interferometer has identified S301 as the fastest known star in the galaxy, reaching 25,000 km/s as it orbits Sgr A* so closely it measurably feels the black hole's rotation. [1]
ANCIENT MILKY WAY MERGER — A Hubble Space Telescope study published in Nature Astronomy shows definitive evidence of a collision between the Milky Way and a dwarf galaxy called LKH approximately 12 billion years ago.
MICROBES AT MOON'S SOUTH POLE — A NASA study published August 19 in Science Advances finds some human-associated microbes could survive in the shaded regions of the Moon's South Pole, raising planetary-protection concerns for Artemis crewed missions.
ARTEMIS III COUNTDOWN SIM — A terminal countdown simulation for Artemis III was conducted August 6 at Kennedy Space Center's Rocco A. Petrone Launch Control Center, marking a hardware readiness milestone.
ARCTIC ZERO CURTAIN MAPPED — A new NASA-led study produced high-resolution maps of the Arctic "zero curtain," the poorly understood phase in which soils linger near freezing for days to weeks before winter freeze, relevant to permafrost and climate models.
GREENLAND ICEBERG DRIFT — NASA Earth Observatory reports a large iceberg observed in summer 2026 has drifted more than 1,000 km south from its origin in northeastern Greenland's bay — an uncommon trajectory tracked via satellite.
EXPEDITION 75 POST-EVA — The ISS Expedition 75 crew completed a spacewalk that uninstalled an antenna from the station's exterior and resumed microgravity research covering the circulatory system, AI, and photography.
VOYAGER 1 MILESTONE APPROACH — NASA notes Voyager 1 is closing in on the one-light-day distance threshold from Earth, a measure of how far the probe has traveled into interstellar space.
🛰️ MISSIONS
ARTEMIS III PREP — Countdown simulation activity was logged at Kennedy Space Center on August 6, 2026, inside the Rocco A. Petrone Launch Control Center ahead of the Artemis III lunar landing mission.
SWIFT BOOST MISSION UPDATE — NASA and Katalyst Space announced LINK spacecraft will not capture or boost the Swift satellite to a higher orbit due to an ongoing attitude-control issue, but rendezvous and proximity operations will still be attempted.
JAXA MMX LAUNCH SCHEDULE CONFIRMED — JAXA formally announced the H3 F10 launch schedule for the Martian Moons eXploration spacecraft on August 20, targeting the moons Phobos and Deimos. [10]
ROMAN CORONAGRAPH COMMUNITY PROGRAM — Multiple arXiv papers this week detail instrument characterization and pipeline development for the Nancy Grace Roman Space Telescope Coronagraph Instrument, including Zernike wavefront sensor calibration and the corgidrp data-reduction pipeline.
NASA ORBITAL CLARITY CHALLENGE — NASA's Heliophysics Division launched the sixth TechLeap Prize, the Orbital Clarity Challenge, seeking new space-weather observation technologies from external teams.
☀️ SPACE WEATHER
M8.1 SOLAR FLARE — NOAA SWPC confirmed an M8.1 X-ray flare from region N04E85, peaking at 11:42 UTC today (August 20); classified R2 Moderate on the NOAA radio-blackout scale, with HF radio degradation on the sunlit side. [2]
TYPE II RADIO BURST AT 1201 KM/S — A Type II radio emission alert was issued at 11:58 UTC today with an estimated shock velocity of 1,201 km/s, suggesting a fast CME may have accompanied the M8.1 flare. [3]
SECOND TYPE II BURST AT 927 KM/S — A further Type II alert (serial 1523) was issued at 20:49 UTC today, with a shock velocity of 927 km/s, indicating continued eruptive solar activity this evening. [4]
ELEVATED GEOMAGNETIC CONDITIONS — A K-index of 4 warning valid through August 20 at 09:00 UTC was in effect, with minor geomagnetic unsettled conditions potentially affecting high-latitude regions.
📄 RESEARCH
LHS 1140 b ATMOSPHERE SEARCH — Four JWST NIRISS SOSS transits found no persistent helium absorption at LHS 1140 b, a temperate planet (Teq ~226 K) straddling the radius valley at ~1.7 Earth radii, with variability attributed to stellar He I activity rather than the planet.
SUB-NEPTUNE CLOUD-HAZE MICROPHYSICS — A new bin-scheme microphysical model shows that in sub-Neptune atmospheres, photochemical hazes and condensate clouds interact strongly: hazes serve as cloud condensation nuclei and are in turn "wet-removed" by cloud droplets, altering observed spectra.
EUROPA RADAR PROPERTIES UPDATED — Ground-based radar observations of Europa from 2011-2024 provide new constraints on its surface scattering properties, the first such data since 1987-1991 measurements, offering context for the Europa Clipper mission.
JWST GALAXIES IN COLIBRE SIMULATIONS — Researchers searched for counterparts to JWST's population of luminous galaxies at redshift z greater than 10 within the COLIBRE simulation suite, testing whether Lambda-CDM galaxy formation can account for the unexpectedly bright early universe objects.
MILKY WAY SPIRAL STRUCTURE FROM YOUNG CLUSTERS — Using young open clusters and young stellar object groups in the solar neighbourhood, a new study finds the Milky Way's spiral pattern near the Sun is segmented rather than smooth continuous logarithmic arms, refining our picture of the Galaxy's local structure.
SGR A* SPIN MEASUREMENT — A new analysis applying the outflow method to six independent sets of simultaneous X-ray and radio data constrains the dimensionless spin angular momentum and black hole mass of Sgr A*, complementing ESO's direct stellar-orbit detection of spin effects reported today.
SUPER-KAMIOKANDE DSNB CONSTRAINS AXIONS — A 2.6-sigma indication of the diffuse supernova neutrino background from Super-Kamiokande is used to set new limits on axion cooling in stellar cores, constraining axion-nucleon coupling parameters.
Space Pulse is compiled from NASA, ESA, JAXA, ESO, NOAA SWPC, Launch Library 2, and arXiv astro-ph. All times UTC.
📎 Sources
- Milky Way's fastest star orbits our supermassive black hole so… — ESO
- Space Weather Message Code: SUMXM5 — NOAA SWPC Alerts
- Space Weather Message Code: ALTTP2 — NOAA SWPC Alerts
- Space Weather Message Code: ALTTP2 — NOAA SWPC Alerts
- Long March 5 | Chang'e 7 — Launch Library 2
- Long March 6C | Unknown Payload — Launch Library 2
- Falcon 9 Block 5 | Starlink Group 10-49 — Launch Library 2
- Replay: MTG-I2 pre-launch media briefing — ESA Top News
- ESA’s photosynthesis satellite fuelled — ESA Top News
- [release] Launch schedule of the Martian Moons eXploration (MM… — JAXA Press
Curated from official sources — NASA/ESA/JAXA/ESO/NOAA/arXiv/Launch Library. Informational only.
Serial 20260820-22-v62 · 2026-08-20 22:02 UTC · pulse.uzylab.com