Coordinates

RA: 09^h02^m06^s.854
DEC: -40^∘33'16''.751
Position-uncertainty [arcsec]: 1.674 × 10^-5
Galactic-longitude [deg]: 263.06
Galactic-latitude [deg]: 3.93
Coordinate-Reference

Binary System

Alternative Name: Vel X-1
X-ray Type: CL,EB,RS,SG,XP
Mean Distance [kpc]: 1.87
Distance Range [kpc]: 1.62 - 2.03
Hydrogen Column density [10²¹ cm⁻²]: 200.0

Compact Object

Mass Range [M_☉]: 1.7 - 2.1^[1]
Orbital Period [d]: 8.96^[1][2]
Pulse Period [s]: 283.0^[1][2][3]
CRSF energy [keV]: 24 (2)^[1]
XMM-Newton flux [10^-12 erg cm^-2 s^-1]:485.76 - 1184.06 (0.2-12.0 keV)
Swift/XRT flux [10^-12 erg cm^-2 s^-1]:1759.0 (0.3-10.0 keV)
Swift/BAT flux [10^-12 erg cm^-2 s^-1]:4018.59 (14-195 keV)

Optical Counterpart

Gaia DR3 Name: 5620657678322625920
Counterpart: confirmed
Spectral Type: B0.5 Ib^[1][2][3]
G [mag]: 6.7351(0.0030)
V [mag]: 6.87
J [mag]: 5.833(0.020)
H [mag]: 5.705(0.034)
K [mag]: 5.596(0.024)
W1 [mag]: 7.18(0.05)
W2 [mag]: 5.615(0.013)
Effective stellar temperature [K]: 13595.0