XMMU J172005.6+575759

CONFIRMED Draco Dwarf  

Equatorial coordinates
α =  260.0235487 ± 0.286100 | 17 20 05.651690
δ =  57.966232 ± 0.300700 | +57 57 58.433849
Constellation Draco
Symbiotic IR Type S
Spectral Type  
Magnitude range (V)  
Outbursts No


XMMU J172005.6+575759 GSC TYC WRAY
SIMBAD SDSS J172005.64+575758.4 HIP SAO Hen
BD – IRAS GAIA DR2 1433203270683657344 ESO


Right ascension (°) 260.0235487 ± 0.286100ref  Parallax (mas) Reddening E(B-V) (mag) 0.025 ± 0.001ref
Declination (°) 57.966232 ± 0.300700ref Distance (kpc) 80 ± 10ref     
Galactic longitude (°) 86.430826 ± 0.300700ref Proper motion in α (mas/yr)    
Galactic latitude (°) 34.733472 ± 0.286100ref   Proper motion in δ (mas/yr)    


U (mag)   X-Ray Yesref Flickering  
B (mag) 20.20ref X-Ray type βref Outbursts No
V (mag) 19.53ref IUE No Type  
R (mag) 19.11ref IRAS flux at 12 μm (Jy)   IPmax (eV)  
I (mag) 18.59ref IRAS flux at 25 μm (Jy)   OVI lines  
G (mag) 19.46ref IRAS flux at 60 μm (Jy)      
J (mag)   IRAS flux at 100 μm (Jy)      
H (mag)   WISE W1 (mag)      
K (mag)   WISE W2 (mag)      
L (mag)   WISE W3 (mag)      
    WISE W4 (mag)      
    Radio flux (mJy)      


Orbital period (days)   γ velocity (km/h) -294.0ref 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) 4973ref Radius (R)   Type  
IR type Sref Luminosity (L)   Pulsation period (days)  
Metallicity [Fe/H] -2.28ref     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 a symbiotic binary by Saeedi et al. (2019). The system has no counterpart in WISE and 2MASS catalogs.


Last updated: Jun 11, 2019 @ 9:29 am