Launch data:
| Designation | 00163 / 1961 Sigma1 / 61018A |
| Launch date | 12 Jul 1961 - 15:11 UT |
| Launch site | Va, LC1-2 |
| Launch vehicle | Atlas-LV3 Agena-B (#97D/1201) |
| Mission | Military: early warning |
| Earth orbit on Jul 12, 1961 (.7): | |
| Perigee / Apogee | 3358 x 3534 km |
| Eccentricity | 0.009 |
| Inclination | 91.2 deg |
| Period | 161.54 min |
| Earth orbit on Aug 03, 2000 (.92): | |
| Perigee / Apogee | 3343x 3544 km |
| Eccentricity | 0.010 |
| Inclination | 91,15° |
| Period | 161,45 min |
