TIROS 4 ISIS 1 DEB

0.025% collision chance on 2025-08-27 07:08:23z

CDM information

Conjunction Data Message description

TIROS 4 is risking orbital collision with ISIS 1 DEB. The time of closest approach (TCA) between the two objects is calculated to be at Aug. 27, 2025, 7:23 a.m., with a collision probability of 0.025%. The closest distance at TCA is estimated to be 738.0 meters.

Note: this is the latest available calculation for this conjunction event. Access all the most updated CDMs for object TIROS 4 in its detailed page.

Key information

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

TCA: 2025-08-27 07:23:37z

CDM ID: 1131479865

Miss distance: 738.0 (m)

Collision probability: 0.0002531059 (~0.025%)

Last Updated: 1 week, 5 days ago

Objects comparison

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

TIROS 4	Name	ISIS 1 DEB
226	Norad ID	31999
PAYLOAD	Type	DEBRIS
LEO	Orbit	HEO
48.29°	Inclination	88.41°
MEDIUM	Size	SMALL
US	Country	CA
Feb. 8, 1962	Launch date	Jan. 30, 1969
	Full details

Live tracking

Real-time ground track for TIROS 4 and ISIS 1 DEB.

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