Gamma Scuti
Star in the constellation Scutum
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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]
 | |
| 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 | |
| γ Sct, BD−14°5071, FK5 696, GC 25220, HD 170296, HIP 90595, HR 6930, SAO 161520, GSC 05702-02882 | |
| Database references | |
| SIMBAD | data |
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]