Table Mountain Pi ( π Table Mountain, lat. Pi Mensae , π Men) is a star in the constellation Table Mountain . It is located at a distance of about 60 light years from the Sun. It has a visible magnitude of +5.65 m , that is, a star can hardly be seen with the naked eye. It has at least two candidates for exoplanets .
| π Table Mountain, π Men | |||
|---|---|---|---|
| Star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 59.39 St. years (18.21 pc ) | ||
| Visible magnitude ( V ) | +5.65 | ||
| Constellation | Table Mountain | ||
| Astrometry | |||
| Radial velocity ( R v ) | +9.4 km / s | ||
| Own movement (μ) | RA: 311.88 mas per year Dec: 1050.20 mas per year | ||
| Parallax (π) | 54.92 ± 0.45 mas | ||
| Absolute magnitude (V) | + 4.37 | ||
| Specifications | |||
| Spectral class | G1 IV | ||
| Color Index ( B - V ) | 0.60 | ||
| Color Index ( U - B ) | 0.11 | ||
| Variability | missing | ||
| physical characteristics | |||
| Weight | 1,1 M ☉ | ||
| Radius | 2.1 ± 0.01 R ☉ | ||
| Age | 3.83⋅10 9 years | ||
| Temperature | 5888 K | ||
| Luminosity | 4.73 L ☉ | ||
| Metallicity | [M / H] = 0.09 | ||
| |||
| Database Information | |||
| SIMBAD | |||
Features
The π Star of Table Mountain is a yellow-orange dwarf of the main sequence , reminiscent of our Sun in mass and size. The mass is slightly larger than that of the Sun , the radius is 2 times the solar. The luminosity of the star is estimated at 4.7 solar, the surface temperature is about 5888 degrees Kelvin . According to the generally accepted model, the age of a star is estimated at approximately 4 billion years. It is moving away from the Earth at a speed of 9.4 km / s.
Planet System
In 2000, a group of astronomers discovered [2] a possible planet orbiting π of Table Mountain. This planet, designated Pi Table Mountain b , has a mass of approx. 10 masses of Jupiter. It circulates in an elongated orbit at an average distance of about 3 a. e. from the parent star and makes a complete revolution in 5.65 years. Due to its powerful gravity and elongated orbit, the Jupiter-like Pi of Table Mountain b is able to influence other possible planets in the habitable zone , pushing them closer to the star or into outer space. Therefore, the probability of the presence of other planets in the habitable zone of this system is extremely small. However, the existence of life on the satellites of this planet is not excluded.
In 2018, the TESS space telescope using transit photometry discovered in the Pi Stolovaya Gora system its first candidate for the exoplanet Pi Stolova Gora c , which is a super-earth . The planet has a circulation period of 6.27 days, a mass of approx. 4.9 Earth masses, radius approx. 2.1 Earth radii, semimajor axis of the orbit 0.06839 ± 0.00050 a. e. (10.26 million km, Mercury at perihelion approaches the Sun at 46 million km), orbital inclination of 87.27 ± 0.07 ° [3] .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | > 10.35 | ? | 2063,818 | 3.29 | 0.62 |
| c | ~ 0.015 (4.9 M⊕ ) | ~ 0.19 (2.1 R⊕ ) | 6.27 | 0.06839 ± 0.00050 | <0.3 |
Nearest star environment
According to the Yale catalog of bright stars [4] , Table Mountain π (designated in it as HR 2022) belongs to the moving group of 61 Swan stars. Below are the nearest neighbors of the star, located within 20 light years from it:
| Star | Spectral class | Distance, st. years old |
| α Chameleon | F4-6 IV-III | 9.9 |
| L 57-44 | MV | 10.0 |
| Gj 3021 | G6 v | 13 |
| I Kiel | F0-3 IV / F2 IV | 17 |
| CP (D) -65,475 | K1 V-IIIp | 18 |
Notes
- ↑ 1 2 3 4 Gaia Data Release 2 - 2018.
- ↑ A probable planetary companion to HD 39091 from the Anglo-Australian Planet Search - Jones - 2002 - Monthly Notices of the Royal Astronomical Society - Wiley Online Library (link not available - history ) .
- ↑ Huang; Burt, Jennifer. TESS Discovery of a Transiting Super-Earth in the Π Mensae System // The Astrophysical Journal Letters: journal. - 2018 .-- arXiv : 1809.05967v1 .
- ↑ Archived copy (inaccessible link) . Date of treatment May 27, 2019. Archived on August 6, 2009.
See also
- Table Mountain constellation stars list