Epoch J2000 Equinox J2000
|Right ascension||17h 01m 47.3875s|
|Declination||–58° 57′ 29.681″|
|Apparent magnitude (V)||6.137|
|Spectral type||B1 V:ne or B2 IVne|
|U−B color index||–0.956|
|B−V color index||–0.078|
|Radial velocity (Rv)||–6 km/s|
|Proper motion (μ)||RA: –2.91 mas/yr
Dec.: –9.01 mas/yr
|Parallax (π)||2.32 ± 0.38 mas|
|Distance||approx. 1,400 ly
(approx. 430 pc)
|Mass||10.1 ± 0.3 M☉|
|Luminosity (bolometric)||11,045 L☉|
|Age||20.4 ± 0.4 Myr|
HD 153261 is the Henry Draper Catalogue designation for a star in the southern constellation of Ara. It has an apparent visual magnitude of 6.137, placing it near the threshold of naked eye visibility. According to the Bortle Dark-Sky Scale, it can be viewed from dark suburban or rural skies. Based upon an annual parallax shift of just 2.32 mas, it is located at a distance of around 1,400 light-years (430 parsecs) from Earth.
This star has been catalogued with a stellar classification of B1 V:ne or B2 IVne, indicating that it is either a main sequence or a subgiant star. The 'n' indicates a nebulous spectrum created by the Doppler shift-broadened absorption lines from a rapid rotation, while the 'e' means this is a Be star, with the spectrum showing emission lines from hot, circumstellar gas. HD 153261 display some variability with an amplitude of 0.090 in magnitude, and is a suspected spectroscopic binary.
HD 153261 is a large star with over ten times the Sun's mass and around 4.5 the radius of the Sun. It shines with more than 11,000 times the brightness of the Sun, with this energy being radiated into space at an effective temperature of 21,150 K. At this heat, it glows with the blue-white hue of a B-type star.
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