🚀 Space Pulse · 2026-09-05 22:01 UTC
SPACE PULSE
Saturday, September 6, 2026 | Edition 74
⚡ TL;DR
BepiColombo has begun its critical Mercury arrival sequence after eight years in transit, while NASA's Roman Space Telescope is freshly in orbit and already generating excitement. [1] [2]
Today is active across the board: a minor solar proton event is ongoing, a batch of fresh exoplanet confirmations landed, and the LVK gravitational-wave catalogue from O4 just dropped. [3] [4] [5]
🚀 LAUNCHES
UPCOMING - ELECTRON / 6x HAWKEYE 360
- Rocket Lab is targeting no earlier than September 30 to orbit six HawkEye 360 RF-intelligence satellites for the civil SIGINT and maritime monitoring constellation. [6]
UPCOMING - FALCON 9 BLOCK 5 / SDA TRANCHE 1 TRANSPORT LAYER A
- SpaceX is scheduled no earlier than September 30 to lift the first USSF Space Development Agency Proliferated Warfighter Space Architecture Tranche 1 Transport Layer batch for resilient military communications. [7]
UPCOMING - ELECTRON / LOXSAT 1
- Rocket Lab is also scheduled NLT September 30 to fly Eta Space's LOXSAT 1, a NASA Tipping Point-sponsored demonstration of a full cryogenic liquid-oxygen fluid management system on a Photon-LEO bus. [8]
UPCOMING - H3 F10 / MMX
- JAXA has announced the H3 Launch Vehicle Flight 10 will carry the Martian Moons eXploration spacecraft; the August 20 press release confirmed the launch schedule is set. [9]
🔭 DISCOVERIES
ROMAN SPACE TELESCOPE IN ORBIT
- NASA's Nancy Grace Roman Space Telescope has reached space and is beginning its commissioning phase, with agency scientists describing the launch and early operations in a new podcast episode released today. [2]
EXOPLANET BATCH - SUPER-EARTHS AROUND HD 50554
- NASA has confirmed two new super-Earths orbiting the F-type star HD 50554: HD 50554 c (5.3 Earth masses, 6-day orbit at 0.065 AU) and HD 50554 d (10.4 Earth masses, 28.1-day orbit at 0.183 AU), both announced in 2026. [10]
EXOPLANET BATCH - HOT JUPITERS TOI-3053 b AND TOI-3278 b
- TOI-3053 b (0.85 Jupiter masses, 3-day orbit around a G-type star) and TOI-3278 b (0.3 Jupiter masses, 3.2-day orbit around a G-type star) are newly confirmed hot Jupiters.
EXOPLANET BATCH - COOL NEPTUNE TOI-4409 b
- TOI-4409 b, a Neptune-like world of 14.9 Earth masses orbiting a K-type star every 92.5 days at 0.37 AU, joins the confirmed exoplanet catalogue for 2026.
EXOPLANET BATCH - MICROLENSING NEPTUNES
- Two cold Neptune-like planets found via gravitational microlensing: KMT-2025-BLG-1160L b (25.4 Earth masses, 5.4-year orbit at 2.56 AU) and KMT-2025-BLG-0975L b (29.8 Earth masses, 2.3-year orbit at 0.81 AU).
EXOPLANET BATCH - GAS GIANT AROUND AN L-TYPE STAR
- CD-35 2722 B b is a 0.92-Jupiter-mass gas giant orbiting an L-type (ultracool) dwarf star every 171.1 days at 0.2 AU, a rare find confirmed in 2026. [5]
TODAY'S APOD - CHASING THE MOON'S SHADOW
- NASA's Astronomy Picture of the Day for September 5 features imagery and storytelling from a solar eclipse shadow chase, highlighting the geometry of totality.
🛰️ MISSIONS
BEPICOLOMBO - MERCURY ARRIVAL BEGINS
- ESA and JAXA's BepiColombo mission executed the first critical step of Mercury orbit insertion on September 3, jettisoning the Mercury Transfer Module after eight years of joint travel through the inner Solar System. [1]
ROMAN SPACE TELESCOPE - EARLY OPERATIONS
- Roman is in space and NASA experts who worked on the telescope for years are publicly walking through what happens next and the timeline to first science images. [2]
JAXA MMX - LAUNCH SCHEDULE CONFIRMED
- JAXA formally announced the H3 F10 launch schedule for the Martian Moons eXploration spacecraft, which will visit Phobos and Deimos and attempt a Phobos sample return. [9]
☀️ SPACE WEATHER
ACTIVE PROTON EVENT TODAY - S1 MINOR ONGOING
- NOAA SWPC issued a Proton 10 MeV Warning (WARPX1) at 16:20 UTC today, valid through 23:59 UTC September 5, with flux above 10 pfu; onset confirmed by an S1-Minor alert (ALTPX1) with event beginning at 16:15 UTC. [3]
HIGH-ENERGY PROTON COMPONENT ALSO ELEVATED
- A separate NOAA warning (WARPC0) and alert (ALTPC0) flagged 100 MeV proton flux exceeding 1 pfu from 15:52 UTC today, indicating a more energetic particle population consistent with a significant solar energetic particle event.
TYPE II AND TYPE IV RADIO BURSTS - SEPTEMBER 4
- NOAA detected a Type II radio emission beginning 19:22 UTC September 4 with a shock velocity of 698 km/s, accompanied by a Type IV burst starting at 19:24 UTC, signaling a CME-driven shock event likely driving today's proton flux.
CONTEXT - EARLIER SOLAR ACTIVITY
- An M8.1-class flare at N04E85 on August 20 (peak 11:42 UTC, R2-Moderate radio blackout) launched a CME-associated shock moving at 1,201 km/s, establishing this as an active solar period.
📄 RESEARCH
STELLAR FLYBY EXPLAINS TRANS-NEPTUNIAN ORBIT MYSTERY
- A new arXiv paper argues that the tilted, eccentric orbits of Trans-Neptunian Objects are best explained by a close stellar flyby: a 0.8 solar-mass star passing within 110 AU at 70 degrees inclination sometime in the past 4.5 billion years of Solar System evolution.
JWST DETECTS LYMAN-ALPHA FROM A GALAXY AT z ~ 9
- JWST NIRSpec observed galaxy C3PO-8447 at z = 8.998 for over 10 hours and detected Lyman-alpha emission with an escape fraction of 1.5 plus-or-minus 0.3 percent and a velocity offset of 210 km/s, offering a rare window into reionization-era photon leakage.
LVK O4 GRAVITATIONAL-WAVE CATALOGUE RELEASED
- The LIGO-Virgo-KAGRA Collaboration has published a comprehensive catalogue of all detections from Observing Run 4, marking what the paper calls the transition from milestone events to routine gravitational-wave astronomy. [4]
SGR A-STAR PINNED IN SPACE TO RULE OUT INTERMEDIATE-MASS BLACK HOLE COMPANION
- Researchers report the first proper motion and acceleration of Sgr A*'s infrared counterpart in the Gaia-CRF3 reference frame, placing new upper limits on any intermediate-mass black hole orbiting the Galactic center's supermassive black hole.
HYDROCARBON MOLECULES DETECTED ON TITAN WITH HIGH-RESOLUTION SPECTROSCOPY
- A new study applies high-resolution cross-correlation spectroscopy to Saturn's moon Titan, detecting hydrocarbon signatures whose individual spectral lines are too faint to identify directly, advancing atmospheric characterization techniques for icy moons.
MARS GULLY ACTIVITY TIED TO SEASONAL CO2 ICE AT SISYPHI CAVI
- Analysis of the active Martian gully site Sisyphi Cavi (68 degrees S, 1 degrees E) finds that CO2 seasonal ice processes, rather than liquid water, are likely responsible for current modification of these geologically recent landforms.
SPACE PULSE is grounded in official sources only: NASA, ESA, JAXA, NOAA SWPC, arXiv astro-ph, and Launch Library 2.
Next edition: 2026-09-06 22:00 UTC
📎 Sources
- BepiColombo’s Mercury arrival begins - full replay — ESA Top News
- Roman Series: Liftoff! — NASA Science
- Space Weather Message Code: WARPX1 — NOAA SWPC Alerts
- A catalogue of insights from the fourth LIGO-Virgo-KAGRA obser… — arXiv astro-ph
- CD-35 2722 B b — NASA Science
- Electron | 6x HawkEye 360 — Launch Library 2
- Falcon 9 Block 5 | SDA Tranche 1 Transport Layer A — Launch Library 2
- Electron | LOXSAT 1 — Launch Library 2
- [release] Launch schedule of the Martian Moons eXploration (MM… — JAXA Press
- HD 50554 d — NASA Science
Curated from official sources — NASA/ESA/JAXA/ESO/NOAA/arXiv/Launch Library. Informational only.
Serial 20260905-22-v73 · 2026-09-05 22:01 UTC · pulse.uzylab.com