Fortnight 200 m Conjunction Report - May 15th to May 28th 2025
There were 126 and 131 conjunctions under 200 m for the last two weeks.
Summary
There are 131 conjunctions under 200 m for the week 2025-05-15 to 2025-05-21 and 126 conjunctions under 200 m for the week 2025-05-22 to 2025-05-28
The majority of conjunctions occur at altitudes less than 600 km
The closest conjunctions each week were:
18 m between OneWeb-0118 (ID: 47264) and CZ-6A debris (ID: 54262) at a geodetic altitude of 1222 km on 2025-05-18
31 m between Vesta-1 (ID: 43781) and Starlink-32910 (ID: 63089) at a geodetic altitude of 464 km on 2025-05-26
At any point you can get this data yourself by going to https://overhead.docksat.space and signing up for a free account using the Log In button ( then Create Account ). If you want to download the complete history and other data you can also sign up for a subscription
For context, all of these objects recorded by the Overhead app are moving at velocities of 5 km/s upwards so a conjunction of 50 m represents a timeframe of 10 ms. Relative velocities can be over 10 km/s. There would not be time to make a significant manoeuvre, if at all.
Total Counts
The total conjunction counts produced by the Overhead web app relating to Payload-To-Other conjunctions excluding payloads to payloads in their own family (ONEWEB to ONEWEB for example) is shown below.
The relative conjunction distances and altitudes where they occur (note distance axis is reversed) are shown below:
Data for the graphs can be found at:
Overhead Weekly Report - 2025-05-21
Overhead Weekly Report - 2025-05-28
Closest Conjunctions
The closest conjunction this week were:
18 m between OneWeb-0118 (ID: 47264) and CZ-6A debris (ID: 54262) at a geodetic altitude of 1222 km on 2025-05-18
31 m between Vesta-1 (ID: 43781) and Starlink-32910 (ID: 63089) at a geodetic altitude of 464 km on 2025-05-26
OneWeb-0118 is part of a communications constellation flying above 1200 km. (Note: OneWeb was previously called WorldVu). Starlink-32910 is one the newer generation Starlink satellites.
Vesta-1 is a 3U CubeSat developed to test ship-to-satellite and satellite-to-ship communication networks and a new type of VHF data exchange protocol. It is a UK based satellite built by SSTL working in collaboration with Honeywell.
Satellite data is shown below (Note each dot is a different interaction with a different satellite).
Altitude:
Overhead:
Payload family percentages (i.e. what payload family makes up the most conjunctions):
From the altitude data, you can see where Vesta-1 ran the gauntlet of the Starlink altitude region starting at around September 2023 and lasting until July 2024.
Summary (again)
There are 131 conjunctions under 200 m for the week 2025-05-15 to 2025-05-21 and 126 conjunctions under 200 m for the week 2025-05-22 to 2025-05-28
The majority of conjunctions occur at altitudes less than 600 km
The closest conjunctions each week were:
18 m between OneWeb-0118 (ID: 47264) and CZ-6A debris (ID: 54262) at a geodetic altitude of 1222 km on 2025-05-18
31 m between Vesta-1 (ID: 43781) and Starlink-32910 (ID: 63089) at a geodetic altitude of 464 km on 2025-05-26
As described in What is Overhead? these conjunctions are calculated from projected positions for a 24 hour period using satellite TLE data from Space Track.org where data is updated each day. Conjunctions are filtered to leave Payload-to-Other types, excluding payload families to each other. Data starts from Jan 1st 2021 until now. Take from that what you will and use at your discretion.
