Astronomy Daily · S05E146 · “Postcards from Mars” · Tuesday 21 July 2026 NASA’s Psyche probe phones home from its Mars flyby — data and a spellbinding month-long time-lapse — as Europe’s Plato planet-hunter clears its final test. From the Royal Astronomical Society’s National Astronomy Meeting: a CubeSat that could give us hours of solar-storm warning, and a new way to forecast the Sun’s next active spell. Plus the first pieces of the giant ngVLA radio array, and a Southern Hemisphere meteor shower to catch this week.

Story notes & sources 1 · Psyche phones home NASA’s Psyche spacecraft (launched 2023; arriving metal asteroid 16 Psyche in 2029) used a 15 May Mars gravity assist to test its instruments. The neutron spectrometer detected the anticipated count-rate enhancement near closest approach; the gamma-ray/neutron spectrometer, magnetometer and imager all performed well. Data and a month-long Mars time-lapse were released this week. ● NASA/JPL — “Psyche Mission Delivers Mars Flyby Data, Time-lapse Video” (17 Jul 2026) ● Lawrence Livermore National Laboratory — LLNL-built gamma-ray sensor’s first planetary measurements (17 Jul 2026) 2 · Plato clears its final exam ESA’s Plato — 26 cameras hunting Earth-like planets in the habitable zones of Sun-like stars — passed electromagnetic compatibility testing in the Maxwell chamber at ESTEC, its last major qualification hurdle. It’s bound for Sun-Earth L2 aboard an Ariane 6 (current target 2027). ● ESA — “Plato’s electronics ready for space” (20 Jul 2026) 3 · HENON space-weather CubeSat Presented at NAM 2026: HENON, a deep-space CubeSat that would sit ~15 million km upstream of Earth (10× farther than L1), potentially extending severe geomagnetic-storm warning from ~15 minutes to 2–3 hours. It carries the UK-built MAGIC magnetometer (Imperial College London) plus instruments from the Czech Republic and Finland, paving the way for a future European early-warning mission. ● Royal Astronomical Society / NAM 2026 — “From 15 minutes to 3 hours” (20 Jul 2026) 4 · The Sun’s “sleep” precursor Also at NAM 2026: a newly identified precursor in the solar cycle’s declining phase that could help predict the next maximum’s sunspot number. After the Sun’s active phase “switches off,” storms weaken and track a 27-day (solar-rotation) rhythm — pointing to co-rotating fast-wind streams rather than coronal mass ejections. ● Royal Astronomical Society / NAM 2026 — “How the Sun goes to ‘sleep’…” (20 Jul 2026) 5 · Building the ngVLA The US National Science Foundation, NSF NRAO and the US Naval Observatory are partnering on a pathfinder for the next-generation Very Large Array (ngVLA) — the ~266-antenna successor to the iconic VLA. The focus is very long baseline interferometry for ultra-sharp imaging and for maintaining the International Celestial Reference Frame. Construction/early operations are expected before the end of the decade. ● NSF NRAO / US Naval Observatory — ngVLA pathfinder partnership (17 Jul 2026) 6 · Skywatch: Southern Delta Aquariids Active mid-July to late August, peaking 29–30 July, with a radiant near Skat (δ Aquarii) — high overhead for Southern Hemisphere observers. ~15–20 faint, graceful meteors/hour under dark skies; suspected parent comet 96P/Machholz. A near-full Buck Moon spoils the peak, so the moon-free pre-dawn hours this week are the best window. Bright, slow Alpha Capricornid fireballs join in toward month’s end. ● Scientific American / EarthSky / American Meteor Society — Delta Aquariids 2026
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