TSIS-2
TSIS-2 is an upcoming Rocket Lab Electron mission, targeting no earlier than Q1 2027 from Launch Complex 1 on New Zealand's Mahia Peninsula.
Mission State
Rocket Lab has not published a precise launch time yet.
Coverage often appears closer to launch, especially for updated NET dates.
Launch Updates
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Launch moved to flying on Electron, NET early 2027.
by Cosmic_Penguin Source: nasa.gov -
NET 2027.
by Cosmic_Penguin Source: science.nasa.gov -
NET October 2025.
by Cosmic_Penguin Source: x.com
Updates via Launch Library 2 (The Space Devs).
Mission Overview
The Total and Spectral Solar Irradiance Sensor 2 (TSIS-2) is a satellite designed by NASA to measure the Sun's energy input to Earth. TSIS-2 comprises two instruments, the Total Irradiance Monitor (TIM), and the spectral Irradiance Monitor (SIM). TIM measures total brightness and SIM measures spectral irradiance over a wavelength range that includes 96% of the energy in the solar spectrum. Both instruments are similar to those used for the TSIS-1 mission onboard the International Space Station.
In the news
- NASA Selects Rocket Lab to Launch Sun, Earth Sciences Missions (opens in a new tab) Rocket Lab
NASA selected Rocket Lab for three Electron launches. Two back-to-back launches deploy PolSIR CubeSats from New Zealand no earlier than June 2027. One launch carries the TSIS-2 satellite in early 2027.
Technical Details
Jellyfish likelihood
Too early to tellToo early to tell — depends on the final launch time.