ISEE-3

1970–1985: Solar-System Firsts and Scientific Reach

ISEE-3

First spacecraft placed at Sun–Earth L1; later flew by comet Giacobini–Zinner.

Era 2 of 6 · full record in the catalog

Launch
12 Aug 1978
Lead / partner
United States / ESA
Target
Sun–Earth L1 / comet
Category
Heliophysics / comet flyby
Status
Success
Vehicle
Thor-Delta 2914
Mass
unknown
Orbit / trajectory
Heliocentric orbit

Why it happened

ISEE-3 flew during 1970–1985: Solar-System Firsts and Scientific Reach, as part of United States / ESA's work toward sun–earth l1 / comet. A sourced write-up of the context around this mission is still on the editorial queue; nothing here is invented to fill the gap.

The mission

The full narrative of this mission is pending research and writing. What is recorded so far: First spacecraft placed at Sun–Earth L1; later flew by comet Giacobini–Zinner.

Results

First spacecraft placed at Sun–Earth L1; later flew by comet Giacobini–Zinner.

Related missions

ISEE-3 Seasat — competitor Seasat Venera 11 — competitor Venera 11 HEAO-1 — competitor HEAO-1 Voyager 1 & 2 — competitor Voyager 1 & 2

Seasat

Partial success

United States · 1978

HEAO-1

Success

United States · 1977

Sources & image credits

  • Unknown authorUnknown author, via Wikimedia Commons · Public domain · license: public-domain (source, checked 2026-08-23)
  • Mission record: AntarikshPedia canonical dataset (data-sources/missions_timeline.md)
  • Specifications reference: NASA NSSDCA Master Catalog