Eta Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 52m 28.369s |
| Declination | +01° 00′ 20.37″ |
| Apparent magnitude (V) | 3.87 (3.49–4.3) |
| Characteristics | |
| Spectral type | F6 Iab (or F6Ib–G4Ib) + B9.8 V + F1−5 V |
| U−B color index | +0.51 |
| B−V color index | +0.89 |
| Variable type | δ Cep |
| Astrometry | |
| Radial velocity (Rv) | 10.82±0.55 km/s |
| Proper motion (μ) | RA: +8.890 mas/yr Dec.: −8.322 mas/yr |
| Parallax (π) | 3.6715±0.1942 mas |
| Distance | 885.8+41.7 −45.0 ly (271.6+12.8 −13.8 pc) |
| Absolute magnitude (MV) | −3.70 |
| Details | |
| A | |
| Mass | 4.24±0.58; 5.7; 6.15; M☉ |
| Radius | 59±2 R☉ |
| Luminosity | 3,368±195 L☉ |
| Surface gravity (log g) | 1.834 cgs |
| Temperature | 5,747±19 K |
| Metallicity [Fe/H] | –0.19 dex |
| Age | 150±50 Myr |
| B | |
| Mass | 2.3 M☉ |
| Other designations | |
| Eta Aql, η Aql, η Aquilae, 55 Aquilae, AAVSO 1947+00, BD+00°4337, FK5 746, GC 27517, HD 187929, HIP 97804, HR 7570, SAO 125159, PPM 168843, 2MASS J19522835+0100203 | |
| Database references | |
| SIMBAD | data |
Eta Aquilae is a multiple star system in the equatorial constellation of Aquila, the eagle. Its name is a Bayer designation that is Latinized from η Aquilae, and abbreviated Eta Aql or η Aql. This star was once part of the former constellation Antinous. Its apparent visual magnitude varies between 3.49 and 4.3, making it one of the brighter members of Aquila. Based upon parallax measurements made by the Gaia spacecraft on its third data release (DR3), this star is located at a distance of approximately 272 parsecs (890 light-years). The primary component is a Classical Cepheid variable.