GQ Lupi
A visual band light curve for GQ Lupi. The main plot (from ASAS data), shows the long-term variability, and the inset plot (adapted from Broeg et al.) shows the short-term periodic brightness variation. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lupus |
| GQ Lupi A | |
| Right ascension | 15h 49m 12.1054s |
| Declination | −35° 39′ 05.058″ |
| Apparent magnitude (V) | 11.3–14.3 |
| GQ Lupi C | |
| Right ascension | 15h 49m 13.3078s |
| Declination | −35° 39′ 11.761″ |
| Apparent magnitude (V) | 19.72 |
| Characteristics | |
| GQ Lupi A | |
| Evolutionary stage | Pre-main sequence |
| Spectral type | K7Ve |
| B−V color index | 0.96 |
| Variable type | T Tauri variable |
| GQ Lupi C | |
| Evolutionary stage | Pre-main sequence |
| Spectral type | M4 |
| Astrometry | |
| GQ Lupi A | |
| Radial velocity (Rv) | −3.6±1.3 km/s |
| Proper motion (μ) | RA: −14.133 mas/yr Dec.: −23.329 mas/yr |
| Parallax (π) | 6.4893±0.0289 mas |
| Distance | 503 ± 2 ly (154.1 ± 0.7 pc) |
| GQ Lupi C | |
| Proper motion (μ) | RA: −14.508 mas/yr Dec.: −23.862 mas/yr |
| Parallax (π) | 5.7229±0.3559 mas |
| Distance | 570 ± 40 ly (170 ± 10 pc) |
| Position (relative to GQ Lupi A) | |
| Component | GQ Lupi C |
| Projected separation | 2430 AU |
| Details | |
| GQ Lupi A | |
| Mass | 1.03±0.05 M☉ |
| Radius | 1.75+0.06 −0.07 R☉ |
| Luminosity | 1.05+0.27 −0.22 L☉ |
| Surface gravity (log g) | 3.7 cgs |
| Temperature | 4306±35 K |
| Rotation | 8.45±0.20 days |
| Rotational velocity (v sin i) | 5.66±0.02 km/s |
| Age | 2.8+1.8 −1.1 Myr |
| GQ Lupi C | |
| Mass | 0.15±0.05 M☉ |
| Radius | 0.87±0.20 R☉ |
| Luminosity | 0.07±0.02 L☉ |
| Temperature | 3230±101 K |
| Rotational velocity (v sin i) | 13±6 km/s |
| Other designations | |
| GQ Lup, WDS J15492-3539 | |
| GQ Lupi A: CD−35°10525 | |
| GQ Lupi C: 2MASS J15491331-3539118 | |
| Database references | |
| SIMBAD | GQ Lupi A |
| SIMBAD | GQ Lupi C |
GQ Lupi is a possible binary star system in the constellation Lupus. The system is young, with an age of a few million years (for comparison, the Solar System is roughly 4.6 billion years old), and is within the Lupus I star-forming region, which is part of the Scorpius–Centaurus association.