4U 1857+01 / 1H 1905+000

DSS color 2MASS AllWISE GLIMPSE 360 XMM Chandra

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Binary

Orbital Period: 1.33$\pm$-99.0 hr [2017ApJ...840....9M]
Eccentricity:
Radial Velocity:

Donor

Spectral Type: M5-WD [2007ApJ...665L.147J]
Mo:

Accretor

Type: NS [1985A&A...147L...3C]
Mx:
Spin Period:
X-ray Bursts: yes [1985A&A...147L...3C]