XMMU J171919.8+575943

CONFIRMED Draco Dwarf  

Equatorial coordinates
α =  259.833310 ± 0.105300 | 17 19 19.994531
δ =  57.995308 ± 0.119800 | +57 59 43.110167
Constellation Draco
Symbiotic IR Type S
Spectral Type  
Magnitude range (V)  
Outbursts No


XMMU J171919.8+575943 GSC TYC WRAY
SIMBAD SDSS J171919.99+575943.1 HIP SAO Hen
BD – IRAS GAIA DR2 1433205607145719936 ESO
HD 2MASS J17191999+5759430 WISE  J171919.92+575943.0 AAVSO


Right ascension (°) 259.833310 ± 0.105300ref  Parallax (mas) Reddening E(B-V) (mag) 0.024 ± 0.002ref
Declination (°) 57.995308 ± 0.046994ref Distance (kpc) 80 ± 10ref     
Galactic longitude (°) 86.473968 ± 0.119800ref Proper motion in α (mas/yr)    
Galactic latitude (°) +34.832284 ± 0.105300ref   Proper motion in δ (mas/yr)    


U (mag)   X-Ray Yesref Flickering  
B (mag) 19.04ref X-Ray type δref Outbursts No
V (mag) 18.41ref IUE No Type  
R (mag) 17.73ref IRAS flux at 12 μm (Jy)   IPmax (eV)  
I (mag) 17.15ref IRAS flux at 25 μm (Jy)   OVI lines  
G (mag) 18.07ref IRAS flux at 60 μm (Jy)      
J (mag) 16.54ref IRAS flux at 100 μm (Jy)      
H (mag) 15.74ref WISE W1 (mag) 15.24ref    
K (mag) 15.78ref WISE W2 (mag) 15.07ref    
L (mag)   WISE W3 (mag) 12.24ref    
    WISE W4 (mag) 9.14ref    
    Radio flux (mJy)      


Orbital period (days)   γ velocity (km/h) -306.59ref Size of giant’s orbit (AU)  
Eccentricity   RV of giant (km/h)   Separation (AU)  
Inclination (°)   Inferior conj. of giant (JD)   Mass function  
Ephemeris type       Mass ratio  
Ephemeris T(JD)          

Cool component

Spectral type   Mass (M)   Pulsation  
Eff. temperature (K) 4660ref Radius (R)   Type  
IR type Sref Luminosity (L)   Pulsation period (days)  
Metallicity [Fe/H] -2.12ref     Ephemeris type  
        Ephemeris T(JD)  

Hot component

Type/Spectra   Mass (M)   Spin period (min)  
Eff. temperature (K)   Radius (R)   Accretion disk  
Lower limit (K)   Luminosity (L)      
Upper limit (K)          


SIMBAD     CDS Portal


This X-ray source was identified as symbiotic binary by Saeedi et al. (2019), who found a bright optical/infrared counterpart of the object observed by XMM-Newton.


Last updated: Jun 11, 2019 @ 9:01 am