Astronomy:HD 73534
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 39m 15.803s[1] |
| Declination | +12° 57′ 37.35″[1] |
| Apparent magnitude (V) | 8.23[2] |
| Characteristics | |
| Spectral type | G5 IV[2] |
| Apparent magnitude (B) | 9.192[3] |
| Apparent magnitude (J) | 6.524±0.018[3] |
| Apparent magnitude (H) | 6.072±0.020[3] |
| Apparent magnitude (K) | 5.962±0.026[3] |
| B−V color index | 0.962±0.021[3] |
| Astrometry | |
| Radial velocity (Rv) | +10.08±0.15[4] km/s |
| Proper motion (μ) | RA: −114.147[1] mas/yr Dec.: −93.787[1] mas/yr |
| Parallax (π) | 11.9576 ± 0.0254[1] mas |
| Distance | 272.8 ± 0.6 ly (83.6 ± 0.2 pc) |
| Absolute bolometric magnitude (Mbol) | 3.42[2] |
| Details[2] | |
| Mass | 1.228±0.060 M☉ |
| Radius | 2.39±0.16 R☉ |
| Luminosity | 3.33±0.43 L☉ |
| Surface gravity (log g) | 3.780±0.060 cgs |
| Temperature | 5,041±44 K |
| Metallicity [Fe/H] | 0.232±0.030 dex |
| Rotation | ~53 d |
| Rotational velocity (v sin i) | < 1.0 km/s |
| Age | 7.1±0.8[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 73534 is star with an orbiting exoplanet companion in the northern constellation of Cancer. With an apparent visual magnitude of 8.23,[2] it is too faint to be visible to the naked eye. The distance to this system is 273 light years based on parallax measurements,[1] and it is drifting further away with a heliocentric radial velocity of +10 km/s.[4]
The star HD 73534 has the proper name Gakyid. The name was selected by Bhutan during the 100th anniversary of the IAU as part of the IAU's NameExoWorlds project. Gakyid means happiness. The planet HD 73534 b is named Drukyul, which means 'land of the thunder dragon', the native name for Bhutan.[7][8]
This is a G-type subgiant star with a stellar classification of G5 IV. It has consumed the hydrogen at its core and begun to evolve off the main sequence, which is why it is much more luminous than the Sun. The star has a negligible level of magnetic activity in its chromosphere. It has 23% more mass than the Sun, and has expanded to 2.4 times the Sun's radius. The star is radiating 3.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,041 K.[2] It is roughly 7 billion[5] years old and is spinning slowly with a rotation period of around 53 days.[2]
In August 2009, it was announced that an exoplanet had been discovered using Doppler spectroscopy.[2] It is the first planetary system discovered in Cancer since that of 55 Cancri in April 1996, and the sixth planet, as 55 Cancri has five known planets.[citation needed]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.01±0.21 MJ | 2.95±0.22 | 1721±36 | 0 (fixed) | — | — |
See also
- HD 179079
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Valenti, Jeff A. et al. (2009). "Two Exoplanets Discovered at Keck Observatory". The Astrophysical Journal 702 (2): 989–997. doi:10.1088/0004-637X/702/2/989. Bibcode: 2009ApJ...702..989V.
- ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 5.0 5.1 Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B.
- ↑ "HD 73534". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+73534.
- ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/.
- ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
- ↑ Ment, Kristo et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal 156 (5): 213. doi:10.3847/1538-3881/aae1f5. Bibcode: 2018AJ....156..213M.
Coordinates: 
08h 39m 15.8035s, +12° 57′ 37.351″
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