Issue 84

Russia Launches New Lotos-S1 ELINT Satellite +1

27 Oct 2023: A Soyuz-2-1b rocket lifted off from Plesetsk, likely carrying a classified payload known as Lotos-S1 no. 7 or 14F145, and a secondary payload. It is the eighth addition to the Liana constellation , performing electronic intelligence from space for the Russian armed forces. The satellite, now labeled…

27 Oct 2023: A Soyuz-2-1b rocket lifted off from Plesetsk, likely carrying a classified payload known as Lotos-S1 no. 7 or 14F145, and a secondary payload. It is the eighth addition to the Liana constellation, performing electronic intelligence from space for the Russian armed forces. The satellite, now labeled Kosmos-2570, deployed a small subsatellite (Kosmos-2571), after circularizing its orbit. Launch Video.

– Lotos-S1 No. 7 was initially cataloged in a 240 x 900 km orbit, inclined 67.1°. This is consistent with other Lotos-S1 satellite transfer orbits.

All of the Lotos-S satellites are in a ~900 km circular orbit and inclined at 67.1°.

– Lotos-S1 No. 7 (Kosmos-2570) joins a network of seven other Lotos satellites, one of which is a developmental version – a Lotos-S spacecraft launched in 2009.

– All eight spacecraft are listed as “active” in publicly- accessible catalogs.

– Other on-line sources note the addition of Kosmos 2570 brings the number of operational satellites to four: 1) Kosmos-2549 (2021); 2) Kosmos-2554 (2022); 3) Kosmos 2565 (2022); and now 4) Kosmos-2570 (2023).

-Kosmos-2570’s initial orbit shows it has opened up a new orbital plane in the Lotos-S constellation. The three earlier satellites are in planes separated by about 120°. Kosmos-2570 has been placed into a plane that is about halfway between that of Kosmos-2554 and 2549.

– As with Kosmos-2565, Russian launch announcement for Kosmos-2570 mentions satellites (plural). The subsatellite release occurred after Kosmos-2570 circularized its orbit on 30 Oct 2023.

– The mission of the sub-satellites (Lotos-S1 No.6 also had one) is unknown. Observers speculate it may be a demonstrator for the possibility of flying an ELINT payload on a small satellite.

Kosmos-2570 launch infographic

Lotos-S1 Model w/ Adapter for Secondary Satellite

Ground Tracks for Operational Lotos-S1 Satellites