<templatestyles src="Template:Sky/styles.css" />Coordinates: Sky map 16h 34m 23.33330s, −04° 00′ 52.0171″

HD 149382

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Template:Short description

HD 149382
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 8.943[2]
Characteristics
Spectral type B5 VI[3]
U−B Template:Engvar −1.143[2]
B−V Template:Engvar −0.282[2]
V−R Template:Engvar −0.127[2]
R−I Template:Engvar −0.135[2]
Astrometry
Radial velocity (Rv)+3[4] km/s
Proper motion (μ) RA: −6.234[1] mas/yr
Dec.: −5.780[1] mas/yr
Parallax (π)13.2407±0.0567 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
Mass0.29Template:Snd0.53[5] Template:Solar mass
Radius0.143[6] Template:Solar radius
Luminosity25.2[6] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[5] cgs
TemperatureScript error: No such module "val".[5] K
Metallicity [Fe/H]−1.30[3] dex
Rotational velocity (v sin i)Script error: No such module "val".[5] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
BD−03°3967, HD 149382, HIP 81145, SAO 141250[7]
Database references
SIMBADdata

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HD 149382 is a hot subdwarf star in the constellation of Ophiuchus with an apparent visual magnitude of 8.943.[2] This is too faint to be seen with the naked eye even under ideal conditions, although it can be viewed with a small telescope.[8] Based upon parallax measurements, this star is located at a distance of about Script error: No such module "convert". 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).[3] 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. Although only about one seventh the diameter of the Sun, it radiates about 25 times as much due to its high temperature. HD 149382 has a visual companion located at an angular separation of 1 arcsecond.[9]

In 2009, a substellar companion, perhaps even a superjovian planet, was announced orbiting the star. This candidate object was estimated to have 8 to 23 times the mass of Jupiter.[5] 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.[9]

See also

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
  2. ↑ a b c d e f Script error: No such module "Citation/CS1". See table II.
  3. ↑ a b c Script error: No such module "Citation/CS1".
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  5. ↑ a b c d e Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "Citation/CS1".

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Template:Stars of Ophiuchus

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