Delta Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 25m 29.90139s |
| Declination | +03° 06′ 53.2061″ |
| Apparent magnitude (V) | 3.365 |
| Characteristics | |
| Spectral type | F0 IV + K |
| U−B color index | +0.031 |
| B−V color index | +0.319 |
| R−I color index | +0.16 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | −30.1 km/s |
| Proper motion (μ) | RA: +254.54 mas/yr Dec.: +82.51 mas/yr |
| Parallax (π) | 64.41±1.00 mas |
| Distance | 50.6 ± 0.8 ly (15.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.46 |
| Orbit | |
| Period (P) | 3.426 ± 0.006 yr |
| Semi-major axis (a) | 0.0539 ± 0.0040″ |
| Eccentricity (e) | 0.36 ± 0.07 |
| Inclination (i) | 150 ± 11° |
| Longitude of the node (Ω) | 337 ± 9° |
| Periastron epoch (T) | 1,954.58 ± 0.13 |
| Argument of periastron (ω) (secondary) | 191 ± 14° |
| Details | |
| δ Aql Aa | |
| Mass | 1.65 M☉ |
| Radius | 2.01±0.04 R☉ |
| Luminosity | 8.52±0.26 L☉ |
| Surface gravity (log g) | 4.03 cgs |
| Temperature | 6,958 ± 46 K |
| Metallicity [Fe/H] | −0.04 dex |
| Rotational velocity (v sin i) | 87.3 km/s |
| δ Aql Ab | |
| Mass | 0.67 M☉ |
| Radius | 0.61 R☉ |
| Other designations | |
| Al Mizān I, δ Aql, 30 Aql, BD+02°3879, FK5 730, GC 26816, GJ 760, HD 182640, HIP 95501, HR 7377, SAO 124603, PPM 167816, WDS J19255+0307A, NLTT 47775 | |
| Database references | |
| SIMBAD | data |
Delta Aquilae is a binary star system in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from δ Aquilae, and abbreviated Delta Aql or δ Aql. This system has an apparent visual magnitude of 3.4 and, based upon parallax measurements, is located at a distance of about 50.6 light-years (15.5 parsecs) from Earth. It is drifting closer with a radial velocity of −30 km/s. The system is predicted to come to within 25.4 ly (7.8 pc) of the Sun in around 335,000 years.