What is the RS61S downlink frequency?

RS61S transmits on 10473.350 MHz (DVB-S2).

When does RS61S pass over my location?

Open RS61S on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

RS61S (239ALFEROV): Frequencies, Status & Passes

Next passes over your station

Pass times depend on where you are. Track RS61S on the live map to see its next passes over your station.

RS61S frequencies

Uplink	Downlink	Beacon	Mode
—	10473.350 MHz	—	DVB-S2
—	—	436.270 MHz	GFSK 9k6

Nominal frequencies, without Doppler. The live map shifts them for your station during a pass. Frequencies: SatNOGS DB (modified: working amateur transmitters only, in MHz), CC BY-SA 4.0.

About RS61S

RS61S, called 239Alferov, is a 3U CubeSat built by Saint Petersburg's Presidential Physics and Mathematics Lyceum No. 239 and the Zh. I. Alferov school within the Russian Space-π programme, on the Geoscan 3U platform. It was launched on 25 July 2025 on a Soyuz-2.1b/Fregat rocket from Vostochny, together with the six Geoscan satellites RS92S1 to RS92S6.

Its science payload is a cosmic gamma-ray transient monitor developed with the Ioffe Institute. It also tests the VERA ablative pulsed plasma thruster.

For radio amateurs the coordinated downlinks are 436.270 MHz on UHF, for GFSK telemetry at speeds up to 19,200 baud, and an X-band downlink on 10473.350 MHz using DVB-S2. In its frequency application the team listed CW, voice, SSTV, SSDV and a digipeater as planned amateur services. Radio amateurs reported SSDV transmissions from it on the AMSAT status page in September 2026.

Status

Listed as working, but nobody reported hearing RS61S on AMSAT in the last 30 days.

From reports filed on AMSAT, last 30 days.

Orbit

Type	Low Earth orbit
Altitude	451–463 km
Inclination	97.5°
Period	93.7 min
TLE epoch	2026-10-28 15:01 UTC

Orbital elements: CelesTrak, checked every 3 hours.

Questions about RS61S

What is the RS61S downlink frequency?: RS61S transmits on 10473.350 MHz (DVB-S2).
What is the RS61S beacon frequency?: The beacon is on 436.270 MHz.
Is RS61S active?: Listed as working, but nobody reported hearing RS61S on AMSAT in the last 30 days.
When does RS61S pass over my location?: Open RS61S on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

RS61S