Delta Scuti
Delta Scuti, Latinized from δ Scuti, is a variable star in the southern constellation Scutum. With an apparent visual magnitude that fluctuates around 4.72, it is the fifth-brightest star in this small and otherwise undistinguished constellation. Analysis of the parallax measurements place this star at a distance of about 199 light-years (61 parsecs) from Earth. It is drifting closer with a radial velocity of −45 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 42m 16.42705s |
| Declination | −09° 03′ 09.2004″ |
| Apparent magnitude (V) | 4.60 - 4.79 |
| Characteristics | |
| Spectral type | F2 IIIp |
| U−B color index | +0.16 |
| B−V color index | +0.35 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | −45.1±0.6 km/s |
| Proper motion (μ) | RA: 7.175 mas/yr Dec.: 1.996 mas/yr |
| Parallax (π) | 16.3644 ± 0.2022 mas |
| Distance | 199 ± 2 ly (61.1 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.72±0.04 |
| Details | |
| Mass | 2.23+0.06 −0.05 M☉ |
| Radius | 4.78±0.38 R☉ |
| Luminosity | 40.0±0.6 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 6,638+277 −247 K |
| Metallicity [Fe/H] | 0.41 dex |
| Rotational velocity (v sin i) | 25.5 km/s |
| Age | 0.7±0.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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