HAT-P-12 is a star that is in the constellation Hounds Dogs at a distance of about 465 light years from us. At least one planet is drawn around the star.
HAT-P-12 | |||
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Star | |||
Observational data ( Epoch J2000.0 ) | |||
Type of | Single star | ||
Right ascension | |||
Declination | |||
Distance | 464.7 St. years (142.5 pc ) [1] | ||
Visible magnitude ( V ) | 12.84 [1] | ||
Constellation | Hounds Dogs | ||
Astrometry | |||
Proper motion (μ) | RA: -132 [2] mas per year Dec: -38 [2] mas per year | ||
Absolute magnitude (V) | 6.89 [1] | ||
Specifications | |||
Spectral class | K4V [1] | ||
physical characteristics | |||
Weight | 0.733 ± 0.018 [1] M ☉ | ||
Radius | 0.701 [1] R ☉ | ||
Age | 2.5 ± 2.0 billion [1] years | ||
Temperature | 4,650 ± 60 [1] K | ||
Luminosity | 0.21 [1] L ☉ | ||
Metallicity | -0.29 [1] | ||
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Information in databases | |||
SIMBAD | data | ||
Sources: [2] | |||
Content
Characteristics
HAT-P-12 is an orange dwarf with a diameter and mass of 0.70 and 0.73 solar, respectively. [1] This star is quite young by astronomical standards, about 2.5 billion years old. It is dimmer than the Sun almost 5 times, and the temperature of its surface is also inferior to the sun: about 4650 degrees Kelvin .
Planetary system
In 2009, within the framework of the HATNet project , a team of astronomers announced the discovery [1] of the planet HAT-P-12 b . This is a gas giant, turning very close to the parent star - at a distance of 0.03 a. e. The planet consists essentially of hydrogen and helium ; at the same time it has a core equal in mass to 10 to the masses of the Earth . Comparing the data with existing theoretical models, the researchers concluded that her age is 1-4.5 billion years.
Planet | Weight ( M J ) | Radius ( R j ) | Period of treatment ( days ) | Big axis orbits ( a. e ) | Eccentricity orbits |
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b | 0.211 ± 0.012 | 0.959 | 3.2130598 ± 0.000006 | 0.0384 ± 0.0003 | 0 |
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 11 12 JD Hartman; G. Á. Bakos; G. Torre; Géza Kovács; RW Noyes; A. Pál; DW Latham; B. Sipöcz; DA Fischer; JA Johnson; GW Marcy; RP Butler; AW Howard; GA Esquerdo; DD Sasselov; Gábor Kovács; RP Stefanik; JM Fernandez; J. Lázár; I. Papp; P. Sár. HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transformer for Metal-Poor K Dwarf (Eng.) . Arxiv.org (Apr 29 2009). The appeal date is January 14, 2010.
- ↑ 1 2 3 SIMBAD (English) . - HAT-P-12 in SIMBAD database . The appeal date is January 14, 2010.
See also
- List of stars of the Hounds Dogs constellation