Close approach · predicted from public data

SCISAT 1 and COSMOS 1275 DEB: 3.88 km apart

SCISAT 1 (satellite) and COSMOS 1275 DEB (debris) are predicted to pass 3.88 km apart at 2026-10-13 12:34 UTC, about 625 km up, closing at 14.5 km/s.

At this moment in the animation

Time (UTC): —
To closest approach: —
Distance between them: —
SCISAT 1 altitude: —
COSMOS 1275 DEB altitude: —

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

Closest approach

Latest data (ours): 3.88 km
Screening (SOCRATES): 47 m
Relative speed: 14.45 km/s
Crossing angle: 146.8°
Over: 45.2°S, 68.6°E
Worst-case probability: 1 in 1,153

The two predictions differ by 3.83 km. The screening used orbit data 6.6 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
SCISAT 1	27858	working satellite	2026-10-08 08:00 UTC	5.2 d screening: 6.3 d
COSMOS 1275 DEB	12723	debris	2026-10-08 05:16 UTC	5.3 d screening: 6.6 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.