Iota2 Cygni
A-type main sequence star in the constellation Cygnus
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Iota2 Cygni is a single[8] star in the constellation Cygnus. Its name is a Bayer designation that is Latinized from ι2 Cygni, and abbreviated Iota2 Cyg or ι2 Cyg, albeit it is often just called ι Cyg.[9] It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.76.[1] Located around 121.3 light-years distant from the Sun based on parallax,[2] it is drifting closer with a radial velocity of â19.5 km/s and is expected to come to within 92 light-years in around 783,000 years.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 29m 42.36s[2] |
| Declination | +51° 43â² 47.2â³[2] |
| Apparent magnitude (V) | 3.76[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A5V[4] |
| BâV color index | +0.148±0.001[1] |
| Astrometry | |
| Radial velocity (Rv) | â19.5±2.7[1] km/s |
| Proper motion (μ) | RA: +20.59[2] mas/yr Dec.: +128.33[2] mas/yr |
| Parallax (Ï) | 26.88±0.11 mas[2] |
| Distance | 121.3 ± 0.5 ly (37.2 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.91[1] |
| Details | |
| Mass | 1.80[5] Mâ |
| Radius | 3.83+0.40 â0.36[6] Râ |
| Luminosity | 34.5±0.5[6] Lâ |
| Surface gravity (log g) | 3.91[5] cgs |
| Temperature | 8,216±279[5] K |
| Rotational velocity (v sin i) | 240[3] km/s |
| Age | 577[5] Myr |
| Other designations | |
| ι2 Cyg, 10 Cygni, BD+51°2605, GC 26947, HD 184006, HIP 95853, HR 7420, SAO 31702[7] | |
| Database references | |
| SIMBAD | data |
This it is an A-type main-sequence star with a stellar classification of A5V,[4] a star that is currently fusing its core hydrogen. It is around 577 million years old[5] and is spinning rapidly with a projected rotational velocity of 240 km/s.[3] The star has 1.8 times the mass of the Sun[5] and 3.8 times the Sun's radius.[6] It is radiating 35 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 8,216 K.[5] Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk.[10]