| absmag_v=
}}{{Starbox detail
| mass = 0.29−0.53[13]
| radius =
| luminosity =
| metal_fe = −1.30[4]
| gravity = {{nowrap|5.80 ± 0.05}}[13]
| temperature = {{nowrap|35,500 ± 500}}[13]
| rotational_velocity = {{nowrap|4.9 ± 1.4}}[13]
}}{{Starbox catalog
| names=BD-03 3967, HD 149382, HIP 81145, SAO 141250[18]
}}{{Starbox reference
| Simbad=HD+149382
}}{{Starbox end}}HD 149382 is a star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.[3] This is too faint to be seen with the naked eye even under ideal conditions, although it can be viewed with a small telescope.[20] Based upon parallax measurements,[ this star is located at a distance of about {{Convert|240|ly|pc|abbr=off|lk=on}} from the Earth.]
This is the brightest known B-type subdwarf star with a stellar classification of B5 VI. It is generating energy through the thermonuclear fusion of helium at its core (triple-alpha process).[4] The effective temperature of the star's outer envelope is about 35,500 K, giving it the characteristic blue-white hue of a B-type star. HD 149382 has a visual companion located at an angular separation of 1 arcsecond.[23]
In 2009, a substellar companion, perhaps even a superjovian planet, was announced orbiting the star.[13] This candidate object was estimated to have nearly half the mass of the Sun. In 2011, this discovery was thrown into doubt when an independent team of astronomers were unable to confirm the detection. Their observations rule out a companion with a mass greater than Jupiter orbiting with a period of less than 28 days.[23]
{{OrbitboxPlanet begin|name=unconfirmed HD 149382}}{{OrbitboxPlanet
| exoplanet = b
| mass = >8-23
| period = 2.391
| semimajor = 0.02343
| eccentricity = 0
| inclination = 39±13
| year = 2009
}}{{Orbitbox end}} See also
References
1. ^1 2 3 4 5 6 {{cite journal | last1=Landolt | first1=Arlo U. |date=May 2009 | title=UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions | journal=The Astronomical Journal | volume=137 | issue=5 | pages=4186–4269 | doi=10.1088/0004-6256/137/5/4186 | bibcode=2009AJ....137.4186L |arxiv = 0904.0638 }} See table II.
2. ^1 {{cite web | title=HD 149382 -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+149382 | accessdate=2010-10-06 }}
3. ^1 {{cite book | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W }}
4. ^1 2 3 {{cite journal | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | last8=Gorgas | first8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 |date=January 2007 | doi=10.1111/j.1365-2966.2006.11196.x | bibcode=2007MNRAS.374..664C | arxiv=astro-ph/0611618 }}
5. ^1 2 3 4 5 {{cite journal | display-authors=1 | last1=Geier | first1=S. | last2=Edelmann | first2=H. | last3=Heber | first3=U. | last4=Morales-Rueda | first4=L. | title=Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution | journal=The Astrophysical Journal Letters | volume=702 | issue=1 | pages=L96–L99 |date=September 2009 | doi=10.1088/0004-637X/702/1/L96 | bibcode=2009ApJ...702L..96G |arxiv = 0908.1025 }}
6. ^1 {{cite book | first1=P. Clay | last1=Sherrod | first2=Thomas L. | last2=Koed | title=A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations | series=Astronomy Series | publisher=Courier Dover Publications | date=2003 | isbn=0-486-42820-6 | page=9 | url=https://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 }}
7. ^1 2 {{citation | display-authors=1 | last1=Norris | first1=Jackson M. | last2=Wright | first2=Jason T. | last3=Wade | first3=Richard A. | last4=Mahadevan | first4=Suvrath | last5=Gettel | first5=Sara | title=Non-detection of the Putative Substellar Companion to HD 149382 | journal=The Astrophysical Journal | volume=743 | issue=1 | page=88 |date=December 2011 | doi=10.1088/0004-637X/743/1/88 | bibcode=2011ApJ...743...88N |arxiv = 1110.1384 }}