| Model | Orbital elements | ||
| GRb | T=20 030 925.94916 | q=1.59103279 | e=0.53867255 |
| (future |
|
|
|
| evolution) | arc: 1988-2004 (3 app) | number of obs.: 559 | |
| GRb | T=20 030 925.91486 | q=1.591012972 | e=0.53867072 |
| (past |
|
|
i=3 |
| evolution) | arc: 1978-1992 (3 app) | number of obs.: 368 | |