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Table 2
Twin-jet kinematic model for 1E 1740.7−2942 radio jets.
| Parameter | Mathematical | Maxima |
| morphology | skeleton | |
| skeleton | ||
|
|
||
| Angle of the | ψ = 1.°8 | ψ = 2.°3 |
| precession cone | ||
| Inclination of the | ||
| jet precession | i = 65.°1 | i = 63.°0 |
| axis with the l.o.s. | ||
| Position angle of the | χ = 339.°6 | χ = 338.°5 |
| jet precession axis | ||
| Precession period | Pp = 481.8 d | Pp = 485.5 d |
| Reference JD(*) | tref = 2 448 303.51 | tref = 2 448 307.85 |
| Jet velocity | vjet = 0.96c | vjet = 0.88c |
| Distance | d = 5 kpc | d = 5 kpc |
|
|
||
| Approaching jet (N) | sjet = + 1 (fixed) | sjet = + 1 (fixed) |
| Receding jet (S) | sjet = −1 (fixed) | sjet = −1 (fixed) |
| Sense of rotation | srot = + 1 (fixed) | srot = + 1 (fixed) |
| (counterclockwise) | ||
|
|
||
| Goodness of fit |
|
|
Notes. Adapted from Hjellming & Johnston (1981). (*) Corresponding to zero precession phase.
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