HD 153261
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ara |
| Right ascension | 17h 01m 47.3875s[1] |
| Declination | –58° 57′ 29.681″[1] |
| Apparent magnitude (V) | 6.137[2] |
| Characteristics | |
| Spectral type | B1 V:ne[3] or B2 IVne[4] |
| U−B color index | –0.956[2] |
| B−V color index | –0.078[2] |
| Astrometry | |
| Radial velocity (Rv) | –6[5] km/s |
| Proper motion (μ) | RA: –2.91[1] mas/yr Dec.: –9.01[1] mas/yr |
| Parallax (π) | 2.32 ± 0.38[1] mas |
| Distance | approx. 1,400 ly (approx. 430 pc) |
| Details | |
| Mass | 10.1 ± 0.3[4] M☉ |
| Radius | 4.5[6] R☉ |
| Luminosity (bolometric) | 11,045[7] L☉ |
| Temperature | 21,150[7] K |
| Age | 20.4 ± 0.4[4] Myr |
| Other designations | |
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,[2] 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,[1] 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[3] or B2 IVne,[4] 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.[9]
HD 153261 is a large star with over ten[4] times the Sun's mass and around 4.5[6] the radius of the Sun. It shines with more than 11,000[7] times the brightness of the Sun, with this energy being radiated into space at an effective temperature of 21,150 K.[7] At this heat, it glows with the blue-white hue of a B-type star.[10]
References
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- ↑ 4.0 4.1 4.2 4.3 4.4 Lua error in package.lua at line 80: module 'strict' not found.
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