HD 50499

HD 50499 is a star in the constellation of constellation of Puppis. With an apparent visual magnitude of 7.21,[2] this star is too faint to be in naked eye visibility. It is located at a distance of 151 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +36.7 km/s.[2]

HD 50499
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension  06h 52m 02.02432s[1]
Declination −33° 54′ 56.0164″[1]
Apparent magnitude (V) 7.21[2]
Characteristics
Spectral type G0/2 V[3]
B−V color index 0.614±0.008[2]
Astrometry
Radial velocity (Rv)+36.69±0.09[2] km/s
Proper motion (μ) RA: −69.326[1] mas/yr
Dec.: +68.089[1] mas/yr
Parallax (π)21.5765 ± 0.0258[1] mas
Distance151.2 ± 0.2 ly
(46.35 ± 0.06 pc)
Absolute magnitude (MV)3.89[2]
Details[4]
Mass1.31±0.07 M☉
Radius1.42±0.02 R☉
Luminosity2.38±0.005 L☉
Surface gravity (log g)4.42±0.05 cgs
Temperature6,099±43 K
Metallicity [Fe/H]0.38±0.03 dex
Rotation22.4±1.0 d
Rotational velocity (v sin i)4.313 km/s
Age2.40±0.56[4] or 6.17[5] Gyr
Other designations
CD−33°3304, GC 9010, HD 50499, HIP 32970, SAO 197294[6]
Database references
SIMBADdata

This object is a G-type main-sequence star with a stellar classification of G0/2 V.[3] It is positioned 0.6 magnitudes above the main sequence, which may be explained by a high metallicity and an older age.[5] Vogt et al. (2005) estimated its age as about 6.2 billion years,[5] although more recent estimates give a younger age of around 2.4[4] billion years. The star has 1.31 times the mass of the Sun and 1.42 times the Sun's radius. It is radiating 2.38 times the luminosity of the Sun from its photosphere at an effective temperature of 6,099 K.[4] As of 2005, at least one extrasolar planet has been confirmed to be orbiting the star.

Planetary system

The first planet discovered, HD 50499 b, is a gas giant with mass of 1.7 times Jupiter. It is a long period, taking 351 weeks to orbit the star. The planet's eccentric orbit passes through the average distance of 574 Gm or 18.6 μpc.

The planet was discovered by four team members including Steven Vogt in 2005 using their radial velocity method, which used to measure changes in red- and blue-shifting of the star that indicate the presence of planets caused by gravitational tug.[5] There is also a linear trend in the radial velocities, which may indicate an additional outer planet. The best two-planet model gives a different period and mass for the inner planet (9.8 years and 3.4 Jupiter masses), with an outer planet of 2.1 Jupiter masses in a 37-year orbit. However the two-planet model does not represent a significant improvement over the model with one planet and a linear trend, so more observations are needed to constrain the parameters of the outer planet.

Rickman et al. (2019) gave updated models of the planets and their orbits, shown below.[4] The HD 50499c is listed as confirmed planet as in 2020.[7]

The HD 50499 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.45±0.08 MJ 3.93±0.07 2483.7±18.3 0.27+0.04
−0.03		 — —
c ≥2.93+0.73
−0.18 MJ		 9.02+1.73
−0.33		 8619.9+2622.5
−405.4		 0.00+0.14
−0.02		 — —
gollark: Æye.
gollark: Maybe reimplement <@715487485643194378> in <@712932812839321722> too.
gollark: One of those... stacked area ones?
gollark: Because you should really use a better type of graph for that.
gollark: What's the black line, "not here"?

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. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. Houk, Nancy (1979). "Michigan catalogue of two-dimensional spectral types for the HD stars". 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H. Cite journal requires |journal= (help)
  4. Rickman, E. L.; et al. (May 2019). "The CORALIE survey for southern extrasolar planets. XVIII. Three new massive planets and two low-mass brown dwarfs at greater than 5 AU separation". Astronomy & Astrophysics. 625: 16. arXiv:1904.01573. Bibcode:2019A&A...625A..71R. doi:10.1051/0004-6361/201935356. A71.
  5. Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901.
  6. "HD 50499". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-05.
  7. exoplanet.eu HD 50499 c

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