Vanguard 1
Orbit facts
| Year/Date |
Incli. |
Period |
Perigee |
Apogee |
| 58-03-17 |
34.25° |
134.18 min |
650 km |
3968 km |
| 59-05-23 |
34.25° |
134.01 min |
657 km |
3936 km |
| 59-07-11 |
34.24° |
134.21 min |
653 km |
3958 km |
| 59-10-06 |
34.25° |
134.03 min |
657 km |
3938 km |
| 59-10-25 |
34.25° |
134.13 min |
655 km |
3949 km |
| 59-12-07 |
34.25° |
134.24 min |
655 km |
3958 km |
| 60-01-07 |
34.25° |
134.13 min |
657 km |
3946 km |
| 60-09-05 |
34.24° |
133.98 min |
649 km |
3942 km |
| 60-11-23 |
34.24° |
134.03 min |
650 km |
3944 km |
| 61-03-28 |
34.25° |
134.07 min |
658 km |
3940 km |
| 62-01-22 |
34.25° |
133.94 min |
649 km |
3939 km |
| 62-02-16 |
34.25° |
134.06 min |
653 km |
3945 km |
| 64-08-11 |
34.25° |
133.99 min |
651 km |
3940 km |
| 67-01-01 |
34.23° |
133.97 min |
650 km |
3940 km |
| 69-05-23 |
34.25° |
133.90 min |
650 km |
3934 km |
| 72-01-29 |
34.26° |
133.84 min |
652 km |
3926 km |
| 75-01-02 |
34.25° |
133.82 min |
651 km |
3926 km |
| 78-01-02 |
34.24° |
133.81 min |
655 km |
3921 km |
| 79-10-01 |
34.26° |
133.74 min |
650 km |
3920 km |
| 80-12-24 |
34.24° |
133.61 min |
652 km |
3906 km |
| 82-04-06 |
34.23° |
133.54 min |
652 km |
3901 km |
| 83-06-17 |
34.26° |
133.47 min |
651 km |
3896 km |
| 86-01-06 |
34.24° |
133.46 min |
651 km |
3894 km |
| 89-01-01 |
34.25° |
133.43 min |
651 km |
3892 km |
| 90-03-29 |
34.24° |
133.30 min |
652 km |
3880 km |
| 91-07-31 |
34.24° |
133.23 min |
651 km |
3875 km |
| 92-04-03 |
34.24° |
133.16 min |
654 km |
3865 km |
| 95-01-01 |
34.25° |
133.12 min |
651 km |
3865 km |
| 98-01-02 |
34.25° |
133.10 min |
650 km |
3864 km |
| 00-07-18 |
34.25° |
133.03 min |
650 km |
3859 km |
Drag has brought down the apogee and perigee, resulting in a decrease in
period. Vanguard I's orbital history illustrates the phenomenom of drag bringing
down apogee much more than perigee.