V_ HZ Her / Her X-1

DSS color 2MASS AllWISE GLIMPSE 360 XMM Chandra

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Binary

Orbital Period: 40.80402696$\pm$2.4e-07 hr [1981ApJ...247.1003D]
Eccentricity: 0.00042$\pm$3e-05 [2009A&A...500..883S]
Radial Velocity: -65.0$\pm$2.0 km/s [1997MNRAS.288...43R]

Donor

Spectral Type: A-F [1994ApJ...436..319A]
Mo: 2.3$\pm$0.3 M$_{\odot}$ [1997MNRAS.288...43R]

Accretor

Type: NS [1972ApJ...174L.143T]
Mx: 1.5$\pm$0.3 M$_{\odot}$ [1997MNRAS.288...43R]
Spin Period: 1.2368$\pm$0.0006 s [1972ApJ...174L.143T]
X-ray Bursts: