V_ V1408 Aql / 4U 1957+11

DSS color 2MASS AllWISE GLIMPSE 360 XMM Chandra

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Binary

Orbital Period: 9.331$\pm$0.003 hr [2011ApJ...730...43B]
Eccentricity:
Radial Velocity:

Donor

Spectral Type:
Mo:

Accretor

Type: BH [2021RAA....21..214S]
Mx: 5.0$\pm$1.0 M$_{\odot}$ [2021RAA....21..214S]
Spin Period:
X-ray Bursts: