Coordinates

RA: 19^h11^m49^s.562
DEC: +04^∘58'57''.751
Position-uncertainty [arcsec]: 2.602 × 10^-5
Galactic-longitude [deg]: 39.69
Galactic-latitude [deg]: -2.24
Coordinate-Reference

Binary System

Alternative Name: 4U 1908+05
X-ray Type: BE,BH,EB,MQ,RS
Mean Distance [kpc]: 6.81
Distance Range [kpc]: 5.54 - 8.48
Hydrogen Column density [10²¹ cm⁻²]: 14.0

Compact Object

Mean Mass[M_☉]: 4.2^[1]
Mass Range [M_☉]: 3.8 - 4.6^[1]
Orbital Period [d]: 13.1^[1]


XMM-Newton flux [10^-12 erg cm^-2 s^-1]:124.01 - 244.75 (0.2-12.0 keV)
Chandra flux [10^-12 erg cm^-2 s^-1]:4.86 (0.5-7.0 keV)
Swift/XRT flux [10^-12 erg cm^-2 s^-1]:152.7 (0.3-10.0 keV)
Swift/BAT flux [10^-12 erg cm^-2 s^-1]:141.89 (14-195 keV)

Optical Counterpart

Gaia DR3 Name: 4293406612283985024
Counterpart: confirmed
Spectral Type: A3-7 I^[1]
G [mag]: 12.603(0.016)
V [mag]: 13.0
J [mag]: 9.398(0.021)
H [mag]: 8.739(0.029)
K [mag]: 8.163(0.024)
W1 [mag]: 7.466(0.020)
W2 [mag]: 6.849(0.012)

Comments

Superorbital period: 23.228 d