HD 153261

HD 153261

A light curve for HD 153261 from Hipparcos data, adapted from Lefèvre et al. (2009)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 01m 47.3875s[2]
Declination –58° 57′ 29.681″[2]
Apparent magnitude (V) 6.137[3]
Characteristics
Spectral type B1 V:ne[4] or B2 IVne[5]
U−B color index –0.956[3]
B−V color index –0.078[3]
Astrometry
Radial velocity (Rv)–6[6] km/s
Proper motion (μ) RA: –2.91[2] mas/yr
Dec.: –9.01[2] mas/yr
Parallax (π)2.32 ± 0.38 mas[2]
Distanceapprox. 1,400 ly
(approx. 430 pc)
Details
Mass10.1 ± 0.3[5] M☉
Radius4.5[7] R☉
Luminosity (bolometric)11,045[8] L☉
Temperature21,150[8] K
Age20.4 ± 0.4[5] Myr
Other designations
CD–58 6607, HD 153261, HIP 83323, HR 6304, SAO 244362, V828 Arae.[9]
Database references
SIMBADdata

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,[3] 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,[2] it is located at a distance of around 1,400 light-years (430 parsecs) from Earth.

In 1983, Christopher Stagg reported that he suspected that HD 153261 is a variable star, and his later observations confirmed that it is in fact variable.[10][11] HD 153261 was given its variable star designation, V828 Arae, in 1987.[12]

This star has been catalogued with a stellar classification of B1 V:ne[4] or B2 IVne,[5] 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 displays some variability with an amplitude of 0.090 in magnitude, and is a suspected spectroscopic binary.[1]

HD 153261 is a large star with over ten[5] times the Sun's mass and around 4.5[7] the radius of the Sun. It shines with more than 11,000[8] times the brightness of the Sun, with this energy being radiated into space at an effective temperature of 21,150 K.[8] At this heat, it glows with the blue-white hue of a B-type star.[13]

  1. ^ a b Cite error: The named reference aaa507_2_11411201 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference aass61_387 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference an331_4_349 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Stagg1 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Stagg2 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kholopov was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).