James Webb Space Telescope — Active mission (science.nasa.gov, checked 2026-11-01). Orbits the Sun–Earth L2 point, ~1.5 million km beyond Earth. There since 2022-01-24.
Euclid — Operating (ESA news through 19 October 2026). Orbits the Sun–Earth L2 point.
SOHO — Active mission (science.nasa.gov, page updated 2026-01-09). Orbits the Sun–Earth L1 point, ~1.5 million km sunward. There since 1996-02-14.
SOLAR-1 (SWFO-L1) — Operating — NOAA's primary solar-wind source since June 2026, with ACE as backup (NOAA SWPC notice, 2026-06-30). Orbits the Sun–Earth L1 point. There since 2026-01-23.
IMAP — Operating — arrived at L1 in January 2026, science since February 2026 (NASA); its real-time I-ALiRT data was in NOAA's feed on 2026-10-29. Maps the heliosphere's edge from the Sun–Earth L1 point. There since 2026-01-10.
Aditya-L1 — Operating — ISRO's third guest-observer cycle runs October–December 2026 (ISRO announcement, 2026-07-16). India's solar observatory at the Sun–Earth L1 point. There since 2024-01-06.
Advanced Composition Explorer (ACE) — Operating — NOAA's backup solar-wind source behind SOLAR-1 (NOAA SWPC notice, 2026-06-30); its real-time data was flowing on 2026-11-01, when NOAA's feed marked it the active source. At the Sun–Earth L1 point since 1997. There since 1997-12-12.
Wind — Operating — JPL's Wind trajectory was revised 2026-09-30 and runs to December 2026 (Horizons). Launched 1994; at the Sun–Earth L1 point since 2004. There since 2004.
TESS — Active, on its extended mission (science.nasa.gov, page updated 2026-08-13). Hunts planets round nearby stars from an orbit of about 13.7 days, in step with the Moon: nominally 108,400 × 376,300 km, the mission design as Horizons' summary gives it.
Chandra X-ray Observatory — Active mission (science.nasa.gov, page updated 2026-04-14), on a reduced budget: $63M for FY26, $11M below full-mission costs (Chandra Users' Committee, 2026-05-06). Its orbit has changed since launch, when it was 10,000 × 140,161 km, inclined 28.5° (chandra.harvard.edu); about 12,800 × 136,000 km above the Earth, inclined 58°, from CelesTrak's elements read 2026-10-31.
Nancy Grace Roman Space Telescope — Active mission — launched 2026-08-30 on a Falcon Heavy (science.nasa.gov), in science commissioning by 2026-10-22 (NASA's Roman blog). On its way to the Sun–Earth L2 point: NASA's plan is final orbit there about 100 days after launch, about early December (Roman blog, 2026-09-14); no word of its arrival was found on 2026-10-31. JPL's trajectory is tracking through 2026-10-18, a prediction after (Horizons).