59 Virgin ( lat. 59 Virginis , GJ 504 ) - a star located in the constellation Virgo at a distance of about 57.3 light-years from us. Visible gloss +5.19 m [2] . At least one exoplanet (or brown dwarf ) is drawn around the star.
| 59 Virgin | |||
|---|---|---|---|
| Star | |||
 Yellow dwarf in the view of the artist. | |||
| Observational data ( Age J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 57.27 ± 0.26 St. years (17.56 ± 0.08 pc ) [1] | ||
| Visible magnitude ( V ) | 5.191 ± 0.005 [2] | ||
| Constellation | Virgo | ||
| Astrometry | |||
| Radial velocity ( R v ) | -25.9 [3] km / s | ||
| Own movement (μ) | RA: -333.83 [3] Dec: 190.24 [3] | ||
| Parallax (π) | 56.95 ± 0.26 [3] mas | ||
| Absolute magnitude (V) | 4.08 ± 0.01 [4] | ||
| Specifications | |||
| Spectral class | G0V [3] | ||
| physical characteristics | |||
| Weight | 1.16 ± 0.05 [2] M ☉ | ||
| Radius | 1.36 ± 0.04 [2] R ☉ | ||
| Age | 0.160 +0.35 −0.06 [1] , 4.5 +2.0 −1.5 [2] , or 2.5 +1.0 −0.7 billion [5] years | ||
| Temperature | 6205 ± 20 [5] K | ||
| Luminosity | 2.15 ± 0.15 [1] L ☉ | ||
| Metallicity | [Fe / H] = 0.28 ± 0.03 [1] | ||
| Rotation | period - 3.33 days. [five] | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [3] | |||
Content
Features
59 Virgin received this designation thanks to John Flemstead , who entered it into his star catalog in the 18th century .
59 Virgo is a yellow dwarf , somewhat larger, massive and hotter than the Sun. Its spectral class is G0V [1] , temperature is 6205 ± 20 K [5] , radius is 1.36 ± 0.04 solar [2] , mass is 1.16 ± 0.05 solar [2] , and luminosity is 2.15 ± 0.15 solar [1] . The period of axial rotation of the star is defined as 3.33 days (it is possible, however, that it is twice as large) [5] .
Researchers paid great attention to the age of the star, since it is needed to estimate the mass and other parameters of its satellite. In 2013, a score of 0.16 +0.35 was published
−0.60 billion years [1] , in 2015 - 4.5 +2.0
−1.5 billion years [2] , and in 2017 - 2.5 +1.0
−0.7 billion years [5] (for comparison: the age of our Sun is estimated at 4.57 billion years).
Estimates of the age of a star based on its rotation speed and its position on the Hertzsprung-Russell diagram diverge significantly. This can be explained by the fact that it absorbed the hot Jupiter circulating around it, which increased its rotation speed and chromospheric activity [5] .
Planet System
In 2011, an international group of astronomers, photographing a star with the 8.2-meter Subaru telescope, discovered the planet GJ 504 b . The discovery was published in 2013. The distance of GJ 504 b from the mother star in the projection onto the celestial sphere is 43.5 a. that is, 1.5 times the radius of the orbit of Neptune (the real distance in space may be even greater) [1] [6] . Thus, the planet receives very little light from the star. Nevertheless, it is rather hot: 271 ± 10 ° C [7] . Its mass, according to initial estimates, is 3–9 masses of Jupiter, and according to a later estimate, it is 20–30 masses of Jupiter, and in this case it is no longer a planet, but a brown dwarf [2] [7] [5] . The radius of the object is estimated at 0.96 ± 0.07 of the radius of Jupiter [7] .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 3-30 | 0.96 ± 0.07 [7] | ? | ≥43.5 | ? |
Notes
- ↑ 1 2 3 4 5 6 7 8 Kuzuhara, M .; Tamura, M .; Kudo, T. et el. Direct Imaging of a Cold Jovian Exoplanet in Orbit around the Sun-like Star GJ 504 // The Astrophysical Journal: journal. - 2013 .-- Vol. 774 , no. 1 . - DOI : 10.1088 / 0004-637X / 774/1/11 . - . - arXiv : 1307.2886 .
- ↑ 1 2 3 4 5 6 7 8 9 Fuhrmann, K .; Chini, R. On the age of Gliese 504 (Eng.) // The Astrophysical Journal. - 2015. - Vol. 806 , no. 2 . - DOI : 10.1088 / 0004-637X / 806/2/163 . - .
- ↑ 1 2 3 4 5 6 SIMBAD (English) . - 59 Virgin in the SIMBAD database . Date of treatment August 8, 2013.
- ↑ Park, Sunkyung; Kang, Wonseok; Lee, Jeong-Eun; Lee, Sang-Gak. Wilson-Bappu Effect: Extended to Surface Gravity // The Astronomical Journal. - 2013 .-- Vol. 146 , no. 4 . - P. 73 . - DOI : 10.1088 / 0004-6256 / 146/4/73 . - . - arXiv : 1307.0592 . (Absolute magnitudes of stars are given in band V according to Hipparcos ).
- ↑ 1 2 3 4 5 6 7 8 D'Orazi, V .; Desidera, S .; Gratton, RG et al. A critical reassessment of the fundamental properties of GJ 504: chemical composition and age // Astronomy & Astrophysics: journal. - 2017 .-- Vol. 598 . - DOI : 10.1051 / 0004-6361 / 201629283 . - . - arXiv : 1609.02530 .
- ↑ Astronomers removed the planet in the wrong place
- ↑ 1 2 3 4 Skemer, AJ; Morley, CV; Zimmerman, NT et al. The LEECH Exoplanet Imaging Survey: Characterization of the Coldest Directly Imaged Exoplanet, GJ 504 b, and Evidence for Superstellar Metallicity // The Astrophysical Journal: journal. - 2016. - Vol. 817 , no. 2 . - DOI : 10.3847 / 0004-637X / 817/2/166 . - . - arXiv : 1511.09183 .
See also
- List of Virgo constellation stars