START 1 CZ-4 DEB

0.024% collision chance on 2025-09-28 05:09:26z

CDM information

Conjunction Data Message description

START 1 is risking orbital collision with CZ-4 DEB. The time of closest approach (TCA) between the two objects is calculated to be at Sept. 28, 2025, 5:26 a.m., with a collision probability of 0.024%. The closest distance at TCA is estimated to be 477.0 meters.

Note: this is the latest available calculation for this conjunction event. Access all the most updated CDMs for object START 1 in its detailed page.

Key information

Parameters and calculations for this potential in-orbit collision event.

TCA: 2025-09-28 05:26:57z

CDM ID: 1166044225

Miss distance: 477.0 (m)

Collision probability: 0.0002372213 (~0.024%)

Last Updated: 3 weeks ago

Objects comparison

A comparison of the two objects interested by this conjunction data message.

START 1	Name	CZ-4 DEB
22561	Norad ID	20849
PAYLOAD	Type	DEBRIS
LEO	Orbit	SSO
75.76°	Inclination	98.66°
LARGE	Size	LARGE
CIS	Country	PRC
March 25, 1993	Launch date	Sept. 3, 1990
	Full details

Live tracking

Real-time ground track for START 1 and CZ-4 DEB.

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