It was also known as the X-ray Explorer Satellite, SAS-A (for "Small Astronomy Satellite" A, being first of the three-spacecraft SAS series), SAS 1, or Explorer 42.
Hal itu juga dikenal sebagai X-ray Explorer Satellite, SAS-A (untuk "Small Astronomy Satellite" A, yang pertama dari tiga seri pesawat ruang angkasa-SAS), SAS 1, atau Explorer 42.