Key facts
- Constellation
- Pegasus
- Right ascension
- 23 07 28.7157
- Declination
- +21 ° 08 ′ 03.311 ″
- Evolutionary stage
- main sequence
- Spectral type
- F0kA5mA5V λ Boo
- U b color index
- −0.04
- Variable type
- γ Dor
via Wikipedia infobox
~15 min read
Encyclopedic overview
HR 8799 is a roughly 42 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 1.4 times the Sun's mass and 5 times its luminosity. It is part of a system that also contains a debris disk and at least four massive planets. These planets 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).
Location
Excerpted from Wikipedia’s “Q584300” article, available under the CC BY-SA 4.0 licence.