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Star in the constellation of Lupus From Wikipedia, the free encyclopedia
GQ Lupi is a T Tauri variable star approximately 495 light-years away[3] in the constellation of Lupus.[5] The star is young and has about 70% of the Sun's mass.[8]
A visual band light curve for GQ Lupi. The main plot (from ASAS data[1]), shows the long-term variability, and the inset plot (adapted from Broeg et al.[2]) shows the short-term periodic brightness variation. | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lupus |
Right ascension | 15h 49m 12.1056s[3] |
Declination | −35° 39′ 05.0540″[3] |
Apparent magnitude (V) | 11.40[4] |
Characteristics | |
A | |
Evolutionary stage | T Tauri star[5] |
Spectral type | K7V[4] |
B−V color index | 0.96[4] |
Variable type | T Tauri variable[5] |
C (2MASS J15491331)[lower-alpha 1] | |
Evolutionary stage | Red dwarf |
Spectral type | M4[6] |
Astrometry | |
Proper motion (μ) | RA: −14.257±0.097[3] mas/yr Dec.: −23.596±0.066[3] mas/yr |
Parallax (π) | 6.5868 ± 0.0473 mas[3] |
Distance | 495 ± 4 ly (152 ± 1 pc) |
Absolute magnitude (MV) | ~5[7] |
Orbit | |
Primary | GQ Lupi A |
Companion | GQ Lupi C (2MASS J15491331)[lower-alpha 1] |
Semi-major axis (a) | 2430 AU[6] |
Details | |
A | |
Mass | 0.7[8] M☉ |
Age | <2 million[8] years |
C (2MASS J15491331)[lower-alpha 1] | |
Mass | ∼0.15[6] M☉ |
Radius | 0.21[6] R☉ |
Temperature | 3190 K |
Other designations | |
Database references | |
SIMBAD | data |
In 2005, Ralph Neuhäuser and his colleagues reported a substellar object, GQ Lupi b, orbiting the star. Along with 2M1207b, this was one of the first extrasolar planet candidates to be directly imaged. The image was made with the VLT telescope at Paranal Observatory, Chile, on June 25, 2004. Depending on its mass and the definition of a planet, GQ Lupi b may or may not be considered a planet.[9] As of 2006, the International Astronomical Union Working Group on Extrasolar Planets described GQ Lupi b as a "possible planetary-mass companion to a young star."[10] GQ Lupi b is listed as "confirmed planet" as in 2020.[11]
In 2020, another low-mass companion of GQ Lupi was discovered at a separation distance of about 16 arcseconds, or 2400 AU. Designated 2MASS J15491331-3539118 under the 2MASS catalogue, it is likely a young stellar object that is gravitationally bound to its primary star. It is estimated to be approximately 15% the Sun's mass and 21% the Sun's radius. It has an effective temperature of about 3190 K, indicating that it is a red dwarf with the spectral type M4.[6]
Companion | Mass | Observed separation (AU) |
b | 1–36[5][12] MJ | 103 ± 37[12] |
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