Voyager 2 flyby of Neptune, August 25, 1989
Data as of 2026-10-12
Closest approach
- Instant (UTC)
- August 25, 1989, 03:55:40 UTC
- Distance from the centre of Neptune
- 29,236 km
- Speed relative to Neptune
- 27.33 km/s
The distance is counted from the centre of the body, not from its surface.
In Galaxy
Open Voyager 2 at this instant, at true scale
Pages of the spacecraft and of the body:
How it is measured
The position of the spacecraft relative to the body is read from Horizons every minute for six hours around the approach, then every second for three minutes around the nearest minute. The closest of those positions is the one published here.
Source
NASA/JPL Solar System Dynamics, Horizons System. Read on October 12, 2026.
Trajectory solution cited by Horizons: Voyager_2_ST+refit2022_m