Compare · Rockets

Eris Block 1 vs Kosmos 11K63

RANKED BY PAYLOAD TO LOW EARTH ORBIT #255 VS #256 CHECKED 29 SEPT 2026

Side by side

Verdict

Eris Block 1 ranks #255 of 311 on Payload to low Earth orbit (305 kg); Kosmos 11K63 ranks #256 (300 kg).

Rank 255 of 311 · leads

Payload to low Earth orbit

305 kg

Launches1

Success rate0%

Payload to GTO—

First flight29 Jul 2025

Height25 m

Liftoff thrust—

Launch mass—

Launch cost—

ReusableNo

StatusActive

Rank 256 of 311

Payload to low Earth orbit

300 kg

Launches126

Success rate93.7%

Payload to GTO—

First flight24 May 1966

Height31 m

Liftoff thrust—

Launch mass48 t

Launch cost—

ReusableNo

StatusRetired

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More Eris Block 1 matchups

Source The Space Devs — Launch Library 2 Last checked 29 Sept 2026