Close approach · predicted from public data

CENTISPACE-2 S10 and SL-16 R/B: 520 km apart

CENTISPACE-2 S10 (satellite) and SL-16 R/B (rocket body) are predicted to pass 520 km apart at 2026-10-10 16:11 UTC, about 847 km up, closing at 13.2 km/s.

After this encounter passes we check fresh tracking data for a week and report here what happened.

At this moment in the animation

Time (UTC): —
To closest approach: —
Distance between them: —
CENTISPACE-2 S10 altitude: —
SL-16 R/B altitude: —

Distance between the two objects, 45 minutes before to 15 minutes after the closest approach (log scale).

Closest approach

Latest data (ours): 520 km
Screening (SOCRATES): 4.50 km
Relative speed: 13.22 km/s
Crossing angle: 125.9°
Over: 10.0°S, 42.9°E
Worst-case probability: 1 in 619,195

The two predictions differ by 516 km. The screening used orbit data 4.0 days old at the time of approach; small errors grow fast, and satellites like Starlink manoeuvre routinely. The newer data is usually the better guide.

The two objects

Object	NORAD	Type	Latest orbit data	Data age at approach
CENTISPACE-2 S10	68359	working satellite	2026-10-07 15:12 UTC	3.0 d screening: 4.0 d
SL-16 R/B	22566	rocket body	2026-10-08 00:32 UTC	2.7 d screening: 3.6 d

What this is, and is not

This is a prediction built from public orbit data, which is accurate to roughly a kilometre and comes without uncertainty estimates. Operators get better data and formal warnings, and may already have moved. A prediction of a few hundred metres is common and rarely ends in a collision; it is the sheer number of them that makes orbit dangerous.

Orbits are calculated in your browser with SGP4, the same model used to produce the data, from CelesTrak GP data (CCSDS OMM). Screening by CelesTrak SOCRATES Plus. Earth imagery: NASA Blue Marble.