What does ESTAR stand for?

Electrically Scanned Thinned Array Radiometer (GFSC)

Electronically-Scanned Thin Array RADAR (SSD)

Electronically Scanned Thinned Array Radiometer (MCD)

Electronically Steered Thinned Array Radiometer (SAUS)

Estimated Arrival (SAUS)

Estimated Arrival Date