Omega2 Aquilae
- For other star systems with this Bayer designation, see Omega Aquilae.
 Location of ω2 (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 19m 53.06650s[1] |
| Declination | +11° 32′ 05.8750″[1] |
| Apparent magnitude (V) | 6.023[2] |
| Characteristics | |
| Spectral type | A2 V[3] |
| U−B color index | +0.07[4] |
| B−V color index | +0.08[4] |
| Astrometry | |
| Radial velocity (Rv) | −26[5] km/s |
| Proper motion (μ) | RA: 43.77[1] mas/yr Dec.: 22.57[1] mas/yr |
| Parallax (π) | 12.27 ± 0.52[1] mas |
| Distance | 270 ± 10 ly (81 ± 3 pc) |
| Details | |
| Radius | 2.0[6] R☉ |
| Temperature | 8,936[7] K |
| Rotational velocity (v sin i) | 154[8] km/s |
| Other designations | |
Omega2 Aquilae (ω2 Aquilae, ω2 Aql) is the Bayer designation for a star in the equatorial constellation of Aquila, the eagle. It has an apparent visual magnitude of 6.0,[2] which is close to the lower limit of detectability with the naked eye. According to the Bortle Dark-Sky Scale, this star can be viewed from dark rural skies. As the Earth orbits about the Sun, this star undergoes a parallax shift of 12.27 mas.[1] This is equivalent to a physical distance of 270 light-years (83 parsecs) from Earth, give or take a 10 light year margin of error.
Analysis of the spectrum of this star shows it to match a stellar classification of A2 V,[3] indicating it is an A-type main sequence star. It is about double[6] the size of the Sun. The outer atmosphere is radiating energy at an effective temperature of 8,936 K,[7] giving it the white hue of an A-type star.[9] Omega2 Aquilae is spinning rapidly with a projected rotational velocity of 154 km/s.[8]
References
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