Sanduleak’s star


Equatorial coordinates
α =  86.331387 ± 0.084740 | 05 45 19.569000
δ =  -71.268560 ± 0.102012 |-71 16 06.720000
Constellation Mensa
Symbiotic IR Type D’🡕
Spectral Type  
Magnitude range (V)  
Outbursts Yes?


Sanduleak’s star GSC TYC WRAY
SIMBAD NAME Sanduleak’s Star HIP SAO Hen
BD – IRAS Z05460-7117 GAIA DR2 4657015446868152320 ESO
HD 2MASS J05451956-7116067 WISE J054519.53-711606.7 AAVSO 000-BLT-635


Right ascension (°) 86.331387 ± 0.084740ref  Parallax (mas) Reddening E(B-V) (mag) 0.232 ± 0.022ref
Declination (°) -71.268560 ± 0.102012ref Distance (kpc) 49.97 ± 0.19ref    
Galactic longitude (°) 281.912253 ± 0.102012ref Proper motion in α (mas/yr) 2.243883 ± 0.179659ref    
Galactic latitude (°) -30.873125 ± 0.084740ref Proper motion in δ (mas/yr) 0.751641 ± 0.205047ref    


U (mag) 16.86ref X-Ray Noref Flickering  
B (mag) 17.41ref X-Ray type   Outbursts Yes?ref
V (mag) 17.06ref IUE Yes Type  
R (mag) 15.69ref IRAS flux at 12 μm (Jy) <0.1258ref IPmax (eV) 114.0ref
I (mag) 16.83ref IRAS flux at 25 μm (Jy) 0.1151ref OVI lines Yesref
G (mag) 17.17ref IRAS flux at 60 μm (Jy) <0.2748ref    
J (mag) 15.92ref IRAS flux at 100 μm (Jy) <2.189ref    
H (mag) 15.23ref WISE W1 (mag) 11.31ref    
K (mag) 13.01ref WISE W2 (mag) 9.79ref    
L (mag)   WISE W3 (mag) 6.96ref    
    WISE W4 (mag) 4.98ref    
    Radio flux (mJy)      


Orbital period (days)   γ velocity (km/h)   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) 4276ref Radius (R)   Type  
IR type D’🡕, ref Luminosity (L)   Pulsation period (days)  
Metallicity [Fe/H]       Ephemeris type  
        Ephemeris T(JD)  

Hot component

Type/Spectra   Mass (M)   Spin period (min)  
Eff. temperature (K) 130000 ± 30000ref Radius (R) 0.092ref Accretion disk  
Lower limit (K)   Luminosity (L) 2400 ± 1200ref    
Upper limit (K)          


SIMBAD     CDS Portal     VSX


Usually classified as a SySt, but no direct evidence exists in the optical to confirm the presence of the giant component. Angeloni et al. (2011) discovered a giant, 14 parsecs long, highly collimated jet from the star. For at least two decades, Sanduleak’s star has been monotonically fading at an apparently constant rate of ∼0.03 mag/yr in all bands (Angeloni et al., 2014).


Last updated: May 2, 2019 @ 11:25 am