🚀 Space Pulse · 2026-09-21 22:01 UTC
SPACE PULSE
Monday, 22 September 2026 — Edition 265
Your daily briefing on launches, discoveries, missions, space weather, and research.
⚡ TL;DR
NASA's Perseverance rover has upended assumptions about early Mars by finding unexpected non-sedimentary geology at Jezero Crater's ancient shoreline, suggesting far more complex water history than models predicted. [1]
A busy week ahead: ESA's Juice swings past Earth on Sep 28, a G1 storm watch is in effect through Sep 24, and two SpaceX missions are cleared for launch within days. [2] [3] [4]
🚀 LAUNCHES
STARLINK GROUP 15-25 — SpaceX Falcon 9 Block 5, status Go for Launch, targeting 30 September at 16:00 UTC; carries a batch of 27 Starlink internet satellites. [4]
TRANSPORTER 18 — SpaceX Falcon 9 Block 5, status To Be Confirmed, targeting 1 October at 18:08 UTC; dedicated sun-synchronous rideshare carrying dozens of commercial and government microsatellites and nanosatellites. [5]
MARTIAN MOON EXPLORER (MMX) — Japan's H3-24 rocket operated by Mitsubishi Heavy Industries, status Go for Launch, targeting 19 October at 19:41 UTC; JAXA mission designed to land on Phobos, collect surface samples, and return them to Earth, with a French/German rover aboard. [6]
DRAGON CRS-2 SPX-35 — SpaceX Falcon 9 Block 5, date To Be Determined around 31 October; SpaceX's 35th Commercial Resupply Services flight to the ISS under NASA's CRS-2 contract, carrying supplies and science payloads aboard a Cargo Dragon 2. [7]
BANDWAGON 5 — SpaceX Falcon 9 Block 5, date To Be Determined around 31 October; dedicated mid-inclination rideshare mission with dozens of small commercial and government satellites. [8]
🔭 DISCOVERIES
MARS WATER COMPLEXITY — When NASA's Perseverance rover examined the Margin Unit at the inner edge of Jezero Crater, scientists expected sedimentary lakebed rocks but instead found geology inconsistent with simple lacustrine deposition, revealing a more complex and dynamic early Martian water system than previously understood. [1] [9]
INTERSTELLAR COMET 3I/ATLAS — A new arXiv study presents multiband, long-baseline photometric monitoring of interstellar comet 3I/ATLAS throughout its 2025-2026 apparition using coordinated global ground-based relay observations, including professional observatories and citizen-operated Unistellar eVscopes; results characterize color evolution across the full encounter. [10]
COLDEST BROWN DWARF ATMOSPHERE — Time-resolved JWST retrieval analysis of WISE J0855-07, the coldest known brown dwarf at roughly 250 K, reveals detectable temperature and chemical variations that directly probe atmospheric physics overlapping the exoplanet regime.
STELLAR STREAM IN NGC 55 — A previously undetected stellar stream has been found in the halo of the LMC-mass dwarf galaxy NGC 55 at 2 Mpc, identified in DECam Local Volume Exploration (DELVE) survey deep imaging, offering new insight into tidal disruption around small galaxies.
SUPERNOVA TURBULENCE — A new study uses galaxy-wide HI superbubble censuses to demonstrate directly that supernovae are a primary driver of large-scale galactic turbulence, resolving a long-standing gap in quantitative evidence.
🛰️ MISSIONS
JUICE EARTH GRAVITY ASSIST — ESA's Jupiter Icy Moons Explorer will fly past Earth on 28 September 2026 in its third gravity assist maneuver; flight controllers will use the close approach to adjust the spacecraft's speed and trajectory on its journey to Jupiter. [2]
PERSEVERANCE AT JEZERO MARGIN UNIT — NASA's Perseverance rover has been investigating the Margin Unit along the ancient shoreline of Jezero Crater since September 2023, and the new findings published today challenge mission scientists' expectations about the sedimentary character of the site. [1] [9]
ESA-ISRO COOPERATION EXTENDED — ESA and ISRO signed an exchange of letters on 21 September extending their Cooperative Agreement for five more years to 8 January 2032, broadening joint space science and applications collaboration between Europe and India.
ESA SPACE ECONOMY FINANCING SUMMIT — On 18 September at ESA Headquarters in Paris, nearly 200 participants including investors, financial institutions, and policymakers convened to align public and private capital behind Europe's growing space economy ambitions.
☀️ SPACE WEATHER
G1 STORM WATCH ACTIVE — NOAA SWPC issued watch WATA20 at 18:32 UTC today, 21 September 2026, forecasting a G1 Minor geomagnetic storm possible on 24 September; conditions remain below G1 on Sep 22 and Sep 23. [3]
PRIOR G2 EVENT FOR CONTEXT — In late August NOAA issued a G2 Moderate geomagnetic storm watch (WATA30), with highest activity predicted on Aug 28-29; that event has since passed but illustrates continuing elevated solar activity this season.
TYPE II AND IV RADIO BURSTS — On 2 September NOAA registered both a Type II radio emission with estimated shock velocity of 1,181 km/s and a coincident Type IV radio emission beginning at 19:20 UTC, signatures of a significant CME-associated solar eruption.
ELEVATED ENERGETIC ELECTRONS — A NOAA continued alert issued 26 August confirmed that 2 MeV electron integral flux had exceeded 1,000 pfu since 21 August, peaking at 1,039 pfu on 26 August at 08:05 UTC, posing charging risks to satellites in high-altitude orbits.
📄 RESEARCH
ULTRAMASSIVE BLACK HOLES WITH JWST — A three-paper series introduces the JWST Ultramassive Galaxy Sample: 8 early-type galaxies with stellar masses above 2 trillion solar masses are being studied with NIRSpec integral-field spectroscopy; Jeans Anisotropic Modelling of stellar kinematics yields direct central black hole mass measurements, and a companion paper finds that black hole growth in these extreme systems is stochastic but tracks stellar mass, broadly consistent with the M-BH/sigma relation.
NEARBY TYPE IIb/Ib SUPERNOVA SN 2026dix — Astronomers report SN 2026dix as a nearby transitional stripped-envelope supernova straddling the IIb and Ib subclasses, with properties consistent with a warm supergiant progenitor and supporting the emerging view that SESNe form a continuum rather than discrete categories.
INTERSTELLAR COMET 3I/ATLAS COLOR MONITORING — Coordinated relay photometry of 3I/ATLAS across its full 2025-2026 apparition delivers multiband color curves tracking compositional or activity changes over time; the dataset blends professional and Unistellar citizen-science telescope networks for continuous coverage. [10]
ASTEROID IMPACT RATES ACROSS THE SOLAR SYSTEM — A three-part N-body simulation study finds that simulated asteroid impact rates disagree with observational records by a factor of a few to roughly 200 across Solar System planets and the Moon; Paper III assesses how LSST will improve pre-impact discovery of known objects and constrain the discrepancy.
ROTATING POPULATION III STARS AND JWST NITROGEN PUZZLE — Geneva stellar evolution models of rapidly rotating metal-free Population III stars are presented to explain the surprising rapid nitrogen enrichment JWST has detected in high-redshift galaxies; yields are tracked from the main sequence through final fates for masses from 5 solar masses upward.
EUCLID Q1 RADIO GALAXY HOTSPOTS — Using Euclid Quick Data Release Q1 data, researchers detect optical synchrotron counterparts to hotspots in powerful radio galaxies, where optical emission constrains high-energy electron distributions that radio observations alone cannot resolve, sharpening understanding of particle acceleration physics.
That is your Space Pulse for 22 September 2026.
Next edition: 23 September 2026 at 06:00 UTC.
Stay curious.
📎 Sources
- NASA Discovery Reveals Complex Water Systems on Early Mars — NASA News Releases
- Juice to fly past Earth for third gravity assist — ESA Top News
- Space Weather Message Code: WATA20 — NOAA SWPC Alerts
- Falcon 9 Block 5 | Starlink Group 15-25 — Launch Library 2
- Falcon 9 Block 5 | Transporter 18 (Dedicated SSO Rideshare) — Launch Library 2
- H3-24 | Martian Moon eXplorer (MMX) — Launch Library 2
- Falcon 9 Block 5 | Dragon CRS-2 SpX-35 — Launch Library 2
- Falcon 9 Block 5 | Bandwagon 5 (Dedicated Mid-Inclination Ride… — Launch Library 2
- NASA Discovery Reveals Complex Water Systems on Early Mars — NASA Science
- Multiband Color Monitoring of 3I/ATLAS through Ground-Based Re… — arXiv astro-ph
Curated from official sources — NASA/ESA/JAXA/ESO/NOAA/arXiv/Launch Library. Informational only.
Serial 20260921-22-v87 · 2026-09-21 22:01 UTC · pulse.uzylab.com