| Yamal-101 | |
| Names List: | Ямал-101 Yamal-100 KA-1 |
| Mission Type: | Communications |
| Operator: | Gazprom Space Systems |
| Cospar Id: | 1999-047A |
| Satcat: | 25896 |
| Website: | https://www.gazprom-spacesystems.ru |
| Mission Duration: | 12 years (planned) Failed on orbit |
| Spacecraft: | Yamal-101 |
| Spacecraft Type: | Yamal-100 |
| Spacecraft Bus: | USP Bus |
| Manufacturer: | RSC Energia (bus) Space Systems/Loral (payload) |
| Power: | 2200 watts |
| Launch Date: | 6 September 1999, 16:36:00 UTC |
| Launch Rocket: | Proton-K / Blok DM-2M |
| Launch Site: | Baikonur, Site 81/23 |
| Launch Contractor: | Khrunichev State Research and Production Space Center |
| Entered Service: | Failed on orbit |
| Last Contact: | 6 September 1999 |
| Orbit Reference: | Geocentric orbit |
| Orbit Regime: | Geostationary orbit |
| Orbit Longitude: | 49° East (planned) |
| Apsis: | gee |
| Trans Band: | 12 C-band |
| Trans Coverage: | Russia |
| Insignia Size: | 200px |
| Programme: | Yamal constellation |
| Next Mission: | Yamal-102 |
Yamal-101 (Russian: Russian: '''Ямал-101''') was an intended geostationary communications satellite that was lost after launch. It was built by RSC Energia and operated by Gazprom Space Systems. It was, along with Yamal-102 the first communications satellite of the Yamal programme and the first iteration of the USP Bus. It was a satellite with 2200 watts of power (1300 watts available for the payload) on an unpressurized bus. It had eight SPT-70 electric thrusters by OKB Fakel for station keeping. Its payload was 12 C-band equivalent transponders supplied by Space Systems/Loral.
It was launched successfully with Yamal-102, on 6 September 1999 at 16:36:00 UTC from Baikonur Site 81/23 by a Proton-K / Blok DM-2M directly to geostationary orbit. Due to a failure in the electrical system at solar panel deployment it was lost right after launch.
After Yamal-101 failed, Gazprom Space Systems registered Yamal-102 as Yamal-101. This caused significant confusion, but the records are clear that the satellite that failed was the original Yamal-101. Insurance paid US$50 million for the failure.[1]