Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scutum |
Right ascension | 18h 29m 11.85388s[1] |
Declination | −14° 33′ 56.9319″[1] |
Apparent magnitude (V) | 4.67[2] |
Characteristics | |
Spectral type | A2:V[3] |
U−B color index | +0.04[4] |
B−V color index | +0.07[4] |
Astrometry | |
Radial velocity (Rv) | -41.00[5] km/s |
Proper motion (μ) | RA: +3.22[1] mas/yr Dec.: −4.02[1] mas/yr |
Parallax (π) | 10.21 ± 0.24 mas[1] |
Distance | 319 ± 8 ly (98 ± 2 pc) |
Absolute magnitude (MV) | −0.28[2] |
Details | |
Mass | 2.91[6] M☉ |
Radius | 4.1[7] R☉ |
Luminosity | 150[6] L☉ |
Surface gravity (log g) | 2.09[8] cgs |
Temperature | 9,016[6] K |
Rotational velocity (v sin i) | 222[6] km/s |
Age | 237[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Scuti, Latinized from γ Scuti, is a single,[9] white-hued star in the southern constellation of Scutum. The apparent visual magnitude of 4.67[2] indicates this is a dim star but visible to the naked eye. Based upon an annual parallax shift of 10.21 mas as seen from Earth,[1] this star is located about 319 light years from the Sun. Currently it is moving towards the Solar System at 41 km/s, which means in 2.35 million years it will pass at just 20 ly (5.519 pc) distance,[10] probably becoming the brightest star in the night sky, at magnitude −2.1, for a period.[11]
This is an A-type main-sequence star[3] with a stellar classification of A2:V.[3] At the age of 237 million years,[8] it is spinning rapidly with a projected rotational velocity of 222 km/s.[6] This is giving the star an oblate shape with a prominent equatorial bulge that is estimated to be 21% larger than the polar radius.[12] The star has an estimated 2.91[6] times the mass of the Sun and 4.1[7] times the Sun's radius. It is radiating 150 times the Sun's luminosity from its photosphere at an effective temperature of 9,016 K.[6]