That's Tomar-Re's Space Sector!
Tomar was a scientist before joining the Green Lantern Corps and becoming the Green Lantern of Space Sector 2813. Here's an excerpt from his Wiki entry:
Tomar's most famous mission while serving in the Corps dealt with the
planet Krypton. Krypton, a planet in sector 2813, was growing
increasingly unstable. It was due to explode, caused by internal
pressures deep inside the planet's core. Tomar-Re sought to use a rare
compound called stellarium to absorb some of the tectonic pressure,
thus saving the Kryptonians. He gathered the compound, and was en
route to Krypton when a yellow solar flare blinded him, and forced him
to drop the stellarium. He quickly recovered, but discovered he was
blind. He gathered what little stellarium he could without his sight,
and proceeded towards Krypton. He was closing in when his vision
started to clear. The first thing he saw upon his sight returning was
Krypton exploding. The Guardians recovered Tomar and brought him back
to Oa, where he healed and rested.
Tomar-Re was a mentor to Hal Jordan and died during Crisis on Infinite Earths when the Central Power Battery that charged all of the Green Lanterns' rings was attacked by the Anti-Monitor. His son, Tomar-Tu, is now GL of Space Sector 2813.