![]() HR 8799 (center) with HR 8799 e (right), HR 8799 d (lower right), HR 8799 c (upper right), HR 8799 b (upper left) from W. M. Keck Observatory | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pegasus |
Right ascension | 23h 07m 28.7157s[1] |
Declination | +21° 08′ 03.311″[1] |
Apparent magnitude (V) | 5.964[2] |
Characteristics | |
Spectral type | kA5 hF0 mA5 V; λ Boo[3][4] |
U−B color index | −0.04[5] |
B−V color index | 0.234[2] |
Variable type | Gamma Doradus variable[2] |
Astrometry | |
Radial velocity (Rv) | −11.5±2[2] km/s |
Proper motion (μ) | RA: 108.284±0.056[1] mas/yr Dec.: −50.040±0.059[1] mas/yr |
Parallax (π) | 24.4620 ± 0.0455 mas[1] |
Distance | 133.3 ± 0.2 ly (40.88 ± 0.08 pc) |
Absolute magnitude (MV) | 2.98±0.08[3] |
Details | |
Mass | 1.43+0.06 −0.07[6] M☉ |
Radius | 1.34±0.05[3] R☉ |
Luminosity (bolometric) | 4.92±0.41[3] L☉ |
Surface gravity (log g) | 4.35±0.05[3] cgs |
Temperature | 7430±75[3] K |
Metallicity [Fe/H] | −0.52±0.08[7][a] dex |
Rotational velocity (v sin i) | 37.5±2[3] km/s |
Age | 30+20 −10[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HR 8799 is a roughly 30 million-year-old main-sequence star located 133.3 light-years (40.9 parsecs) away from Earth in the constellation of Pegasus. It has roughly 1.5 times the Sun's mass and 4.9 times its luminosity. It is part of a system that also contains a debris disk and at least four massive planets. Those planets, along with Fomalhaut b, were the first exoplanets whose orbital motion was confirmed by direct imaging. The star is a Gamma Doradus variable: its luminosity changes because of non-radial pulsations of its surface. The star is also classified as a Lambda Boötis star, which means its surface layers are depleted in iron peak elements. It is the only known star which is simultaneously a Gamma Doradus variable, a Lambda Boötis type, and a Vega-like star (a star with excess infrared emission caused by a circumstellar disk).
Gaia-EDR3
was invoked but never defined (see the help page).simbad-HR8799
was invoked but never defined (see the help page).Gray-Kaye-1999
was invoked but never defined (see the help page).Kaye-Handler-etal-1999
was invoked but never defined (see the help page).Yale-BSC-1991-06
was invoked but never defined (see the help page).Wang-Wang-etal-2020
was invoked but never defined (see the help page).Marois-etal-2011
was invoked but never defined (see the help page).
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