ALPHA 2 SPUTNIK 1 2 USSR 04 OCT 57TYMSC03 JAN 58 96.1 65.0 945 227 BETA 1 SPUTNIK 2 3 USSR 03 NOV 57TYMSC14 APR 58 103.7 65.3 1660 212 ALPHA 1 EXPLORER 1 4 US 01 FEB 58AFETR31 MAR 70 107.2 33.2 1859 347 BETA 2 VANGUARD 1 5 US 17 MAR 58AFETREARTH ORB 133.3 34.3 3880 652 GAMMA 1 EXPLORER 3 6 US 26 MAR 58AFETR28 JUN 58 115.7 33.4 2799 186 DELTA 2 SPUTNIK 3 8 USSR 15 MAY 58TYMSC06 APR 60 106.0 65.2 1864 217 EPSILON 1 EXPLORER 4 9 US 26 JUL 58AFETR23 OCT 59 100.9 50.2 1352 257 ZETA 1 SCORE 10 US 18 DEC 58AFETR21 JAN 59 101.5 32.3 1484 185 ETA 1 PIONEER 1 110 US 11 OCT 58AFETR12 OCT 58 THETA 1 PIONEER 3 111 US 06 DEC 58AFETR07 DEC 58 ALPHA 1 VANGUARD 2 11 US 17 FEB 59AFETREARTH ORB 123.2 32.9 3088 560 BETA 1 DISCOVERER 1 13 US 28 FEB 59AFWTR03 MAR 59 96.0 89.7 968 163 GAMMA 1 DISCOVERER 2 14 US 13 APR 59AFWTR26 APR 59 90.4 89.9 346 239 DELTA 1 EXPLORER 6 (S-2) 15 US 07 AUG 59AFETR30 JUN 61 765.0 47.0 42400 245 EPSILON 1 DISCOVERER 5 18 US 13 AUG 59AFWTR28 SEP 59 94.1 79.9 731 214 EPSILON 2 DISCOVERER 5 CAPSULE 26 US 13 AUG 59AFWTR11 FEB 61 104.3 78.9 1700 218 ZETA 1 DISCOVERER 6 19 US 19 AUG 59AFWTR20 OCT 59 95.1 83.9 846 207 ETA 1 VANGUARD 3 20 US 18 SEP 59AFETREARTH ORB 126.9 33.3 3459 515 THETA 1 LUNA 3 21 USSR 04 OCT 59TYMSC29 APR 60 D IOTA 1 EXPLORER 7 22 US 13 OCT 59AFETREARTH ORB 99.1 50.3 899 531 KAPPA 1 DISCOVERER 7 24 US 07 NOV 59AFWTR26 NOV 59 94.4 81.6 820 158 LAMBDA 1 DISCOVERER 8 25 US 20 NOV 59AFWTR08 MAR 60 103.5 80.5 1661 186 MU 1 LUNA 1 112 USSR 02 JAN 59TYMSCSOLAR ORB NU 1 PIONEER 4 113 US 03 MAR 59AFETRSOLAR ORB XI 1 LUNA 2 114 USSR 12 SEP 59TYMSC15 SEP 59 D ALPHA 1 PIONEER 5 27 US 11 MAR 60AFETRSOLAR ORB BETA 2 TIROS 1 29 US 01 APR 60AFETREARTH ORB 98.5 48.4 705 664 GAMMA 2 TRANSIT 1B 31 US 13 APR 60AFETR05 OCT 67 94.6 51.2 644 363 DELTA 1 DISCOVERER 11 32 US 15 APR 60AFWTR26 APR 60 92.2 80.4 603 166 EPSILON 1 SPUTNIK 4 34 USSR 15 MAY 60TYMSC05 SEP 62 92.5 65.0 514 284 EPSILON 3 SPUTNIK 4 CABIN 36 USSR 15 MAY 60TYMSC15 OCT 65 91.7 65.2 460 257 ZETA 1 MIDAS 2 43 US 24 MAY 60AFETR07 FEB 74 94.3 33.0 494 473 ETA 1 TRANSIT 2A 45 US 22 JUN 60AFETREARTH ORB 100.9 66.7 1005 600 ETA 2 SOLRAD 1 46 US 22 JUN 60AFETREARTH ORB 100.4 66.7 960 595 THETA 1 DISCOVERER 13 48 US 10 AUG 60AFETR14 NOV 60 94.0 82.8 683 258 IOTA 1 ECHO 1 49 US 12 AUG 60AFETR24 MAY 68 117.3 47.3 2157 966 KAPPA 1 DISCOVERER 14 54 US 18 AUG 60AFWTR16 SEP 60 94.4 79.6 803 177 LAMBDA 1 SPUTNIK 5 55 USSR 19 AUG 60TYMSC20 AUG 60 90.7 64.6 340 281 MU 1 DISCOVERER 15 57 US 13 SEP 60AFWTR18 OCT 60 94.1 80.9 755 200 NU 1 COURIER 1B 58 US 04 OCT 60AFETREARTH ORB 107.1 28.3 1213 968 XI 1 EXPLORER 8 60 US 03 NOV 60AFETREARTH ORB 104.0 49.9 1498 399 OMICRON 1 DISCOVERER 17 61 US 12 NOV 60AFWTR29 DEC 60 96.4 81.7 984 190 PI 1 TIROS 2 63 US 23 NOV 60AFETREARTH ORB 96.7 48.5 639 565 RHO 1 SPUTNIK 6 65 USSR 01 DEC 60TYMSC02 DEC 60 88.4 65.0 269 123 SIGMA 1 DISCOVERER 18 67 US 07 DEC 60AFWTR02 APR 61 92.0 81.5 510 233 TAU 1 DISCOVERER 19 68 US 20 DEC 60AFWTR23 JAN 61 90.0 83.4 359 186