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Star in the constellation Andromeda From Wikipedia, the free encyclopedia
HAT-P-28 is the primary of a binary star system about 1320 light-years away. It is a G-type main-sequence star. The star's age is older than the Sun's at 6.1+2.6
−1.9 billion years.[2] HAT-P-28 is slightly enriched in heavy elements, having a 130% concentration of iron compared to the Sun. Since 2014, the binary star system is suspected to be surrounded by a debris disk with a 6.1″(2500 AU) radius.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 52m 00.1876s[1] |
Declination | +34° 43′ 42.205″[1] |
Apparent magnitude (V) | 13.03[2] |
Characteristics | |
Evolutionary stage | main-sequence star |
Spectral type | G |
Astrometry | |
Radial velocity (Rv) | 48.06[3] km/s |
Proper motion (μ) | RA: 25.615(14) mas/yr[1] Dec.: 2.712(11) mas/yr[1] |
Parallax (π) | 2.4728 ± 0.0156 mas[1] |
Distance | 1,319 ± 8 ly (404 ± 3 pc) |
Orbit[4] | |
Primary | HAT-P-28 |
Companion | HAT-P-28 B |
Semi-major axis (a) | 0.994±0.002" (404 AU) |
Details[5] | |
Mass | 1.02±0.05 M☉ |
Radius | 1.10+0.09 −0.07 R☉ |
Luminosity | 1.13+0.23 −0.16[2] L☉ |
Surface gravity (log g) | 4.36±0.06[2] cgs |
Temperature | 5680±90[2] K |
Metallicity [Fe/H] | 0.12±0.08[2] dex |
Rotational velocity (v sin i) | 0.2+0.5 −0.2[2] km/s |
Age | 6.1+2.6 −1.9[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The red dwarf stellar companion was detected in 2015 at a projected separation of 0.972″[7] and confirmed in 2016 to be either bound or comoving.[4]
In 2011 a transiting hot Jupiter planet b was detected on a nearly circular orbit. The planetary equilibrium temperature is 1384±52 K.[2] No orbital decay was detected as in 2018, despite the close proximity of the planet to the host star.[5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.626±0.037 MJ | 0.0434±0.0007 | 3.257215±0.000007 | 0.051±0.033 | 88.0±0.9° | 1.190+0.102 −0.075 RJ |
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