V_ V821 Ara / GX 339-4

DSS color 2MASS AllWISE GLIMPSE 360 XMM Chandra

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Binary

Orbital Period: 42.2088$\pm$0.012 hr [2017ApJ...846..132H]
Eccentricity:
Radial Velocity: 26.0$\pm$2.0 km/s [2017ApJ...846..132H]

Donor

Spectral Type: K1-2III [2017ApJ...846..132H]
Mo:

Accretor

Type: BH [2003ApJ...583L..95H]
Mx: 5.9$\pm$3.6 M$_{\odot}$ [2017ApJ...846..132H]
Spin Period:
X-ray Bursts: