HD 149382
 Artist's impression of brown dwarf HD 149382 b (center) in orbit around the star HD 149382 (right). | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 34m 23.3338s[1] |
| Declination | –04° 00′ 52.015″[1] |
| Apparent magnitude (V) | 8.90[2] |
| Characteristics | |
| Spectral type | B5VI[3] |
| U−B color index | –1.167[4] |
| B−V color index | –0.281[4] |
| Astrometry | |
| Radial velocity (Rv) | 3[5] km/s |
| Proper motion (μ) | RA: –5.95[1] mas/yr Dec.: –3.92[1] mas/yr |
| Parallax (π) | 13.07 ± 1.29 mas[1] |
| Distance | 250 ± 20 ly (77 ± 8 pc) |
| Details | |
| Mass | 0.29−0.53[6] M☉ |
| Radius | 0.24 R☉ |
| Luminosity | 82 L☉ |
| Surface gravity (log g) | 5.80 ± 0.05[6] cgs |
| Temperature | 35,500 ± 500[6] K |
| Metallicity | [Fe/H] = −1.30[3] |
| Rotational velocity (v sin i) | 4.9 ± 1.4[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 149382 is a B-type subdwarf star approximately 242 light-years away from Sun in the constellation of Ophiuchus. In 2009, a substellar companion (even a superjovian planet) was announced orbiting the star.[6] This star has nearly half the mass of the Sun, and is 241 light years away from earth.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >8-23 MJ | 0.02343 | 2.391 | 0 | 39±13° | — |
See also
References
- ^ a b c d e Perryman, M. A. C. (1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help) - ^ a b "HD 149382 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-10-06.
- ^ a b Cenarro, A. J. (2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society. 374 (2): 664–690. Bibcode:2007MNRAS.374..664C. doi:10.1111/j.1365-2966.2006.11196.x.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|month=ignored (help)CS1 maint: unflagged free DOI (link) - ^ a b Landolt (1983). "UBVRI photometric standard stars around the celestial equator". Astronomical Journal. 88: 439–460. Bibcode:1983AJ.....88..439L. doi:10.1086/113329.
{{cite journal}}: Unknown parameter|month=ignored (help) - ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- ^ a b c d e Geier, S.; Edelmann, H.; Heber, U.; Morales-Rueda, L. (2009). "Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382—The Decisive Influence of Substellar Objects on Late Stellar Evolution". The Astrophysical Journal Letters. 702 (1): L96–L99. Bibcode:2009ApJ...702L..96G. doi:10.1088/0004-637X/702/1/L96.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link)
External links
- http://exoplanet.eu/planet.php?p1=HD%20149382&p2=b
- http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20149382b
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