Orbital elements of COSMOS 877
| Launched | 6 December 1976 |
| Flight ended | – |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 9594 |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| 2025 Sep 15 17:56 | 2025 Sep 15 01:03:24 | 74.0275 | 0.00070 | 18.4350 | 268.4026 | 120.3733 | 12.51335 | – |
| 2025 Sep 12 17:57 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 11 17:57 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 10 17:56 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 08 17:57 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 07 17:56 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 06 20:41 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 03 17:57 | 2025 Sep 03 03:11:22 | 74.0298 | 0.00069 | 19.4930 | 284.7138 | 120.3733 | 12.51335 | – |
| 2025 Sep 02 17:56 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Sep 01 17:56 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Aug 31 17:56 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Aug 30 17:56 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Aug 29 17:56 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Aug 28 17:57 | 2025 Aug 27 21:58:51 | 74.0311 | 0.00069 | 20.0451 | 293.2878 | 120.3733 | 12.51335 | – |
| 2025 Aug 27 17:56 | 2025 Aug 23 06:24:31 | 74.0321 | 0.00068 | 20.4579 | 299.7362 | 120.3733 | 12.51335 | – |
| 2025 Aug 26 17:56 | 2025 Aug 23 06:24:31 | 74.0321 | 0.00068 | 20.4579 | 299.7362 | 120.3733 | 12.51335 | – |
| 2025 Aug 25 17:56 | 2025 Aug 23 06:24:31 | 74.0321 | 0.00068 | 20.4579 | 299.7362 | 120.3733 | 12.51335 | – |
| 2025 Aug 24 17:56 | 2025 Aug 23 06:24:31 | 74.0321 | 0.00068 | 20.4579 | 299.7362 | 120.3733 | 12.51335 | – |
| 2025 Aug 23 17:56 | 2025 Aug 23 06:24:31 | 74.0321 | 0.00068 | 20.4579 | 299.7362 | 120.3733 | 12.51335 | – |
| 2025 Aug 22 17:56 | 2025 Aug 17 16:24:52 | 74.0330 | 0.00067 | 20.9537 | 307.7217 | 120.3733 | 12.51335 | – |
| 2025 Aug 20 17:56 | 2025 Aug 17 16:24:52 | 74.0330 | 0.00067 | 20.9537 | 307.7217 | 120.3733 | 12.51335 | – |
| 2025 Aug 19 17:56 | 2025 Aug 17 16:24:52 | 74.0330 | 0.00067 | 20.9537 | 307.7217 | 120.3733 | 12.51335 | – |