Beta Scuti
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum[1] |
| Right ascension | 18h 47m 10.474s[2] |
| Declination | −04° 44′ 52.34″[2] |
| Apparent magnitude (V) | 4.22[3] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | G4IIa[4] |
| U−B color index | +0.84[5] |
| B−V color index | +1.09[5] |
| Astrometry | |
| Radial velocity (Rv) | −28.75±4.88[2] km/s |
| Proper motion (μ) | RA: −7.972 mas/yr[2] Dec.: −16.398 mas/yr[2] |
| Parallax (π) | 4.8549±0.3403 mas[2] |
| Distance | 670 ± 50 ly (210 ± 10 pc)[2] |
| Absolute magnitude (MV) | −2.99[1] |
| Orbit[6] | |
| Period (P) | 834 days |
| Semi-major axis (a) | 2.8 mas |
| Eccentricity (e) | 0.350 |
| Inclination (i) | 105.9° |
| Longitude of the node (Ω) | 288.1° |
| Periastron epoch (T) | 2422480.9 |
| Argument of periastron (ω) (secondary) | 33.9° |
| Details | |
| Radius | 49.26+3.24 −3.72[7] R☉ |
| Luminosity | 1,315±186[7] L☉ |
| Surface gravity (log g) | 0.94[8] cgs |
| Temperature | 4,951±25[7] K |
| Metallicity [Fe/H] | -0.16[1] dex |
| Rotational velocity (v sin i) | 7.8[9] km/s |
| Other designations | |
| β Sct, BD−04°4582, FK5 1489, GC 25730, GSC 05122-01426, HIP 92175, HR 7063, HD 173764, SAO 142618, CCDM 18472-0445 | |
| Database references | |
| SIMBAD | data |
Beta Scuti, Latinized from β Scuti, is a binary star system in the southern constellation Scutum. Based upon an annual parallax shift of 4.85 mas as seen from Earth,[2] it is located approximately 670 light years from the Sun.
Characteristics
[edit | edit source]This is a spectroscopic binary with an orbital period of 2.3 years and eccentricity around 0.35.[10] The secondary is about 3.3 magnitudes dimmer than the primary and estimated as type B9 based on the flux of far-ultraviolet radiation.[11]
The primary component has an apparent visual magnitude of +4.22 and is radiating about 1,315 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,951 K.[7] This yellow-hued star is a G-type bright giant with a stellar classification of G4 IIa.[4] Its angular diameter was measured at 2.121 milliarcseconds by the Navy Precision Optical Interferometer, which gives it a physical radius of approximately 49 R☉ at the estimated distance.[7]
The secondary was directly detected with a magnitude difference of 3.6 at a separation of about 17 milli-arcseconds using observations from the Navy Precision Optical Interferometer.[12] This detection was significant as observations with the Hubble Space Telescope which indicated a companion star was present were not definitive.[13] With an orbit and a parallax the sum of the masses of the two stars can be determined via a dynamical parallax.[14] This eventually can yield a precise mass for the evolved giant primary star.
Beta Scuti was a latter designation of 6 Aquilae.[15]
References
[edit | edit source]- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). XHIP record for this object at VizieR.
- ^ a b c d e f g Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier catalog entry
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
