HD 73526

HD 73526 is a G-type main-sequence star. It is about 318 light-years away[1] in the constellation Vela.

HD 73526
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension  08h 37m 16.4835s[1]
Declination −41° 19′ 08.7873″[1]
Apparent magnitude (V) +9.00[2]
Characteristics
Spectral type G6 V[3]
Astrometry
Radial velocity (Rv)+26.31 ± 0.10[4] km/s
Proper motion (μ) RA: −61.097 ± 0.054[1] mas/yr
Dec.: 158.982 ± 0.051[1] mas/yr
Parallax (π)10.2551 ± 0.0339[1] mas
Distance318 ± 1 ly
(97.5 ± 0.3 pc)
Absolute magnitude (MV)+4.1 ± 0.2[5]
Absolute bolometric
magnitude (Mbol)		+3.7 ± 0.2[5]
Details
Mass1.08 ± 0.05[3] M☉
Radius1.49 R☉
Luminosity1.77 L☉
Surface gravity (log g)4.08 cgs
Temperature5590[3] K
Metallicity+0.25 ± 0.05[3]
Age5.59 Gyr
Other designations
CD−40° 4454, HIP 42282, SAO 220191[2]
Database references
SIMBADdata

Star

The star is cooler, more luminous, similar mass, and larger than our Sun. This star is 22% older than our Sun and with metallicity nearly doubled with the Sun, based on its abundance of iron.

Planetary system

On June 13 2002[6], 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 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 indicated that orbital inclinations of both planets are likely to be near 90°, making the minimum masses very close to the true masses of the planets.[7]

The HD 73526 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >2.07 ± 0.16 MJ 0.66 ± 0.05 187.5 ± 0.3 0.39 ± 0.05 — —
c >2.30 ± 0.17 MJ 1.05 ± 0.08 376.9 ± 0.9 0.40 ± 0.05 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "HD 73526". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-27.
  3. Tinney, C. G.; et al. (2006). "The 2 : 1 Resonant Exoplanetary System Orbiting HD 73526". The Astrophysical Journal. 647 (1): 594–599. arXiv:astro-ph/0602557. Bibcode:2006ApJ...647..594T. doi:10.1086/503706.
  4. Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574. A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474.
  5. Tinney, C. G.; et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal. 587 (1): 423–428. arXiv:astro-ph/0207128. Bibcode:2003ApJ...587..423T. doi:10.1086/368068.
  6. Tinney, Chris (2007-09-07). "AAPS Discovered Planets". Anglo-Australian Planet Search. University of New South Wales. Retrieved 2018-04-17.
  7. Wittenmyer, Robert A.; et al. (2014). "A Detailed Analysis of the HD 73526 2:1 Resonant Planetary System". The Astrophysical Journal. 780 (2). 140. arXiv:1311.6559. Bibcode:2014ApJ...780..140W. doi:10.1088/0004-637X/780/2/140.

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