🚀 Space Pulse · 2026-07-04 22:01 UTC
SPACE PULSE
July 4, 2026 | Your daily space and astronomy briefing
⚡ TL;DR
A prolonged geomagnetic storm peaking at G3-Strong hammered Earth's magnetosphere all day on July 4th, driven by back-to-back M-class solar flares and fast CMEs from the past 48 hours.
Amid the solar fireworks, NASA's Hubble dropped a patriotic stellar image, eight new exoplanets were catalogued, and a robotic servicing spacecraft made first contact with NASA's Swift observatory.
🚀 LAUNCHES
SWIFT BOOST MISSION - Northrop Grumman's Pegasus XL successfully launched Katalyst Space Technologies' LINK spacecraft on July 3 at 08:36 UTC, contracted by NASA to rendezvous with and re-boost the Neil Gehrels Swift Observatory. [1]
STARLINK GROUP 10-42 - SpaceX Falcon 9 Block 5 is scheduled for July 9 at 09:05 UTC carrying a batch of 29 Starlink satellites. [2]
STARLINK GROUP 17-48 - A second SpaceX Falcon 9 batch of 24 Starlink satellites is targeting July 11 at 02:00 UTC. [3]
VIKRAM-I DEMO FLIGHT - Skyroot Aerospace's first Vikram-I rocket is targeting July 12 at 05:00 UTC from India, carrying cubesats in a debut commercial flight. [4]
GRAVITY-1 UNKNOWN PAYLOAD - Orienspace Technology's Gravity-1 rocket is also targeting July 12 at 02:00 UTC, details TBD. [5]
SOYUZ MS-29 - Roscosmos Soyuz 2.1a is set for July 14 at 14:47 UTC, carrying cosmonauts Pyotr Dubrov and Anna Kikina plus additional crew to the International Space Station from Baikonur. [6]
ELECTRON / LOXSAT 1 - Rocket Lab Electron is targeting no earlier than July 17 carrying Eta Space's LOXSAT 1, a NASA Tipping Point-sponsored cryogenic oxygen fluid management demonstration on a Photon-LEO bus. [7]
LONG MARCH 7A UNKNOWN PAYLOAD - CASC is targeting July 17 for an unspecified Long March 7A mission. [8]
LONG MARCH 3B/E UNKNOWN PAYLOAD - CASC has a further Long March 3B/E mission slated for July 23, details TBD. [9]
🔭 DISCOVERIES
HUBBLE STELLAR SPARKLER - NASA's Hubble Space Telescope released a July 4th image featuring red, white, and blue stars glittering against dark space, timed to coincide with the United States' 250th anniversary. [10]
HUBBLE CRIMSON CLOUD - A separate Hubble image released July 3 shows blue and white stars shining against crimson gas clouds, adding to a run of new Hubble imagery this week.
EIGHT NEW EXOPLANETS CATALOGUED - NASA's exoplanet catalog added eight new worlds announced in 2026, including HIP 8923 b (9.98 Jupiter masses, 14.1-year orbit around an F-type star), HD 127195 b and c (twin Saturn-class giants orbiting a K-type star at 1.5 and 2.3 years), HD 125136 b (2.26 Jupiter masses), HD 126105 b (1.67 Jupiter masses), HD 190360 d (11.9 Earth masses, Neptune-like, 88.7-day orbit), TIC 150070085 b (12.8 Earth masses, 10.5-day orbit), and KMT-2023-BLG-0332L b (22 Jupiter masses detected via microlensing).
LINK SPACECRAFT CONTACT ESTABLISHED - Teams successfully made first contact with Katalyst Space's LINK robotic servicing spacecraft the day after its Pegasus XL launch, confirming the craft is healthy ahead of its planned rendezvous with NASA's Swift Observatory.
SULFUR OXIDES FOUND AROUND A B[e] SUPERGIANT - An arXiv paper reports the discovery of sulfur oxide molecules in the circumstellar ejecta of a B[e] supergiant, a class of luminous evolved massive stars whose intense UV fields were long thought to destroy complex chemistry beyond carbon monoxide.
🛰️ MISSIONS
SWIFT ORBIT BOOST - NASA's Neil Gehrels Swift Observatory is the target of Katalyst Space's LINK spacecraft, which will physically attach and re-boost the telescope's orbit in a first-of-kind on-orbit servicing demonstration under NASA's Small Business Innovation Research Phase 3 contract. [1]
EARTHCARE OPERATIONAL AT ECMWF - JAXA's EarthCARE satellite (nicknamed Hakuryu) transitioned to operational data use at the European Centre for Medium-Range Weather Forecasts as of late June 2026, marking a key milestone in the ESA/JAXA Earth observation mission.
ISS AURORA VIEW - ESA astronaut Sophie Adenot, on day 139 of the epsilon mission and orbit 2155, shared a timelapse of what she described as the most spectacular aurora of her mission, captured from the International Space Station on July 3.
☀️ SPACE WEATHER
G3 STRONG STORM - NOAA SWPC confirmed a geomagnetic K-index of 7 beginning at 05:09 UTC on July 4, reaching G3-Strong levels; a G3-or-greater watch remains valid until July 5 at 12:00 UTC.
G2 MODERATE STORM PERIODS - The K-index repeatedly hit 6 (G2-Moderate) throughout July 4, with alerts confirmed at 00:48, 04:50, 08:39, 13:58, and 16:55 UTC, indicating a prolonged and variable storm.
G1 MINOR STORM PERSISTENT - K-index of 5 (G1-Minor) alerts have been firing since before 00:00 UTC July 4 and continued into the evening, with an extended G1 warning valid through July 4 at 23:59 UTC.
R2 MODERATE RADIO BLACKOUT - An M-class X-ray flux alert (R2-Moderate radio blackout) was triggered at 20:40 UTC on July 4, the second R2 event in less than 24 hours.
M6.7 AND M6.3 SOLAR FLARES YESTERDAY - Two significant flares fired on July 3: an M6.7 at location N17W66 peaking at 18:11 UTC and an M6.3 at S06W46 peaking at 18:59 UTC, both rated R2-Moderate; a Type II radio burst at 1,831 km/s shock velocity accompanied the first event, strongly suggesting an associated CME now driving today's storm.
10 CM RADIO BURST - A 10 cm radio burst peaked at 780 solar flux units on July 3 at 18:57 UTC, lasting 3 minutes, indicating intense chromospheric activity alongside the flares.
📄 RESEARCH
WARM JUPITER IN ECCENTRIC ORBIT - NGTS-39 b is a newly confirmed warm Jupiter transiting a Sun-like star with a 58.2-day orbit and significant eccentricity (e = 0.386), first spotted by TESS as a single-transit event and confirmed with NGTS photometry and radial velocity; its long-period eccentric orbit makes it a rare and valuable test case for giant-planet migration theory.
ANDROMEDA'S VAST STELLAR DISC TRACED TO A MERGER - A new study argues that M31's unusually extended stellar disc was formed by a gas-rich major merger roughly 2.5 billion years ago, citing substructures in the inner halo and a widespread starburst episode at that epoch as direct evidence.
SKA ERA BINARY PULSAR GRAVITY TESTS - A review paper outlines how the Square Kilometre Array will sharpen tests of general relativity and alternative gravity theories using binary and trinary pulsars, building on current best measurements of the strong equivalence principle and gravitational radiation.
SIDM HALOS AND BLACK HOLE ACCRETION - Fluid simulations using self-interacting dark matter halos with thermal conduction find distinct accretion signatures around central black holes that differ from cold dark matter predictions, potentially offering an observational discriminant between dark matter models.
HWO CORONAGRAPH IFS DESIGN - A paper describes the design of a near-infrared integral field spectrograph for the Habitable Worlds Observatory coronagraph instrument, intended to characterize potentially habitable exoplanets by covering multiple molecular spectral features simultaneously.
DESI DR1 COSMOLOGY PRIOR BIAS FIXED - Analysts reparameterized the EFTofLSS model used for DESI Data Release 1 full-shape galaxy clustering fits and show that prior-volume projection effects were artificially shifting cosmological parameter estimates; the corrected analysis strengthens confidence in DESI DR1 cosmological conclusions.
📎 Sources
- Pegasus XL | Swift Boost Mission — Launch Library 2
- Falcon 9 Block 5 | Starlink Group 10-42 — Launch Library 2
- Falcon 9 Block 5 | Starlink Group 17-48 — Launch Library 2
- Vikram-I | Demo Flight — Launch Library 2
- Gravity-1 | Unknown Payload — Launch Library 2
- Soyuz 2.1a | Soyuz MS-29 — Launch Library 2
- Electron | LOXSAT 1 — Launch Library 2
- Long March 7A | Unknown Payload — Launch Library 2
- Long March 3B/E | Unknown Payload — Launch Library 2
- NASA’s Hubble Spies Stellar Sparkler for July 4th — NASA News Releases
Curated from official sources — NASA/ESA/JAXA/ESO/NOAA/arXiv/Launch Library. Informational only.
Serial 20260704-22-v17 · 2026-07-04 22:01 UTC