Note: Only forum leaders may delete posts.
*HTML is ON *UBB Code is ON Smilies Legend
Smilies Legend
[b]ISS Reboost Cancellation:[/b] This morning's planned ISS reboost by Progress M-65/30P was cancelled shortly before its scheduled time due to a post-reboost conjunction conflict. Planning of the reboost maneuver originally looked at five options, each with its respective potential for creating a conjunction with Kosmos-2421 satellite pieces and other debris. The five options were then narrowed down to two with the least likelihood for a conjunction (they showed ~1 km radial miss distance). Both options were acceptable as of 24h before the reboost since they stayed out of the 'forbidden' box, defined by 0.75 km radial miss distance, and both were pursued. But at about 2-3 h before the maneuver, the pieces' predicted flight paths had moved into the box, passing at ~0.71 km -- which triggered the cancellation for today. Backup date for the reboost is now 10/4 (Sat), with all options being screened starting 48 hrs before. Significantly (fortunately), the cancellation occurred before attitude control authority was handed over to Russian MCS (Motion Control System). The purpose of the reboost is to set up orbital phasing for the 17S/16S Soyuz launch & landing. The number of conjunctions has increased in the recent past, both due to the Kosmos-2412 debris cloud and the currently unusually quiet sun with the resulting reduced atmospheric density at high altitudes causing less orbital drag, i.e., less orbit clean-up.
Contact Us | The Source for Space History & Artifacts
Copyright 1999-2024 collectSPACE. All rights reserved.