Astronomy:HD 73526
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 37m 16.48335s[1] |
| Declination | −41° 19′ 08.7904″[1] |
| Apparent magnitude (V) | +8.99[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | G6 V[3] |
| B−V color index | 0.737±0.005[2] |
| Variable type | Constant[3] |
| Astrometry | |
| Radial velocity (Rv) | +26.31±0.10[4] km/s |
| Proper motion (μ) | RA: −60.993[1] mas/yr Dec.: 159.192[1] mas/yr |
| Parallax (π) | 10.3311 ± 0.0144[1] mas |
| Distance | 315.7 ± 0.4 ly (96.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +4.1±0.2[5] |
| Absolute bolometric magnitude (Mbol) | +3.7±0.2[5] |
| Details[4] | |
| Mass | 1.01±0.04 1.14±0.15[6] M☉ |
| Radius | 1.53±0.03[6] R☉ |
| Luminosity | 2.14+0.68 −0.52 L☉ |
| Surface gravity (log g) | 4.13±0.06 cgs |
| Temperature | 5,564±16 K |
| Metallicity [Fe/H] | +0.23±0.02 dex |
| Rotational velocity (v sin i) | 1.69±0.26 km/s |
| Age | 9.59±1.00 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73526 is a star in the southern constellation of Vela. With an apparent visual magnitude of +8.99,[2] it is much too faint to be viewed with the naked eye. The star is located at a distance of approximately 316 light-years (97 parsecs) from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +26 km/s.[4] It is a member of the thin disk population.[4]
The stellar classification of HD 73526 is G6 V,[3] indicating this is a G-type main-sequence star that, like the Sun, is generating energy through core hydrogen fusion. Based on its properties, it may be starting to evolve off the main sequence.[3] This star has slightly more mass than the Sun and a 53% greater radius. The abundance of iron in its atmosphere suggests the star's metallicity – what astronomers term the abundance of elements with higher atomic number than helium – is 70% greater than in the Sun. It is a much older star with an estimated age of nearly ten billion years, and is spinning slowly with a projected rotational velocity of 1.7 km/s. The star is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 5,564 K.[4]
Planetary system
On June 13 2002,[8] a 2.1 MJ planet HD 73526 b was announced orbiting HD 73526 in an orbit just a little smaller than that of Venus' orbit around the Sun.[5] This planet receives an insolation 3.65 times that of Earth or 1.89 times that of Venus. This was a single planet system until 2006 when a 2.3 MJ second planet HD 73526 c was discovered. This planet forms a 2:1 orbital resonance with planet b.[3] Although these are minimum masses as the inclinations of these planets are unknown, orbital stability analysis indicates that the orbital inclinations of both planets are likely to be near 90°, making the minimum masses very close to the true masses of the planets.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.25±0.12 MJ | 0.65±0.01 | 188.9±0.1 | 0.29±0.03 | — | — |
| c | ≥2.25±0.13 MJ | 1.03±0.02 | 379.1±0.5 | 0.28±0.05 | — | — |
See also
- List of extrasolar planets
- Gliese 876
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 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Tinney, C. G. et al. (2006). "The 2 : 1 Resonant Exoplanetary System Orbiting HD 73526". The Astrophysical Journal 647 (1): 594–599. doi:10.1086/503706. Bibcode: 2006ApJ...647..594T.
- ↑ 4.0 4.1 4.2 4.3 4.4 Jofré, E. et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics 574: A50. doi:10.1051/0004-6361/201424474. Bibcode: 2015A&A...574A..50J.
- ↑ 5.0 5.1 5.2 Tinney, C. G. et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal 587 (1): 423–428. doi:10.1086/368068. Bibcode: 2003ApJ...587..423T.
- ↑ 6.0 6.1 Stassun, Keivan G. et al. (March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal 153 (3): 20. doi:10.3847/1538-3881/aa5df3. 136. Bibcode: 2017AJ....153..136S.
- ↑ "HD 73526". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+73526.
- ↑ Tinney, Chris (2007-09-07). "AAPS Discovered Planets". University of New South Wales. http://newt.phys.unsw.edu.au/~cgt/planet/AAPS%20Planets.html.
- ↑ 9.0 9.1 Wittenmyer, Robert A. et al. (2014). "A Detailed Analysis of the HD 73526 2:1 Resonant Planetary System". The Astrophysical Journal 780 (2): 140. doi:10.1088/0004-637X/780/2/140. Bibcode: 2014ApJ...780..140W.
External links
- "HD 73526". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+73526.
- Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
Coordinates: 
08h 37m 16.4839s, −41° 19′ 08.767″
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