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
Wikidata facts
- Instance of
- variable star
- Constellation
- Pegasus
- Distance from Earth
- 40.88
- Diameter
- 2004400
- Radius
- 1.44
- Mass
- 1.56
- Variable-star type
- Gamma Doradus variable
- Image
- HR 8799 Debris Disk.jpg
Show 20 more facts
- spectral class
- F0VmA4 lambda Boo
- catalog code
- WDS J23075+2108Aa
- luminosity
- 4.92
- topic's main category
- Category:HR 8799
- Commons category
- HR 8799
- parallax
- 24.462
- epoch
- J2000.0
- absolute magnitude
- 3
- topic has template
- Template:HR 8799
- right ascension component of proper motion
- 108.284
- declination component of proper motion
- -50.04
- right ascension
- 346.86964883731
- declination
- 21.13425299097
- apparent magnitude
- 5.240
- stellar rotational velocity
- 50.5
- radial velocity
- -12.60
- age estimated by a dating method
- 0.06
- metallicity
- -1.5616
- effective temperature
- 7301
- surface gravity
- 13200
Sources (2)
via Wikidata · CC0
~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.