Iota1 Cygni
Binary star system in the constellation Cygnus
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Iota1 Cygni is a probable binary star[7] system in the northern constellation Cygnus. Its name is a Bayer designation that is Latinized from ι1 Cygni, and abbreviated Iota1 Cyg or ι1 Cyg. It is separated by less than a degree from its brighter visual neighbor, Iota2 Cygni.[10] It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 5.75.[9] The system is located approximately 387 light years away based on parallax,[2] and it is drifting further away with a radial velocity of +2 km/s.[5]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 27m 25.96022s[2] |
| Declination | +52° 19′ 13.5871″[2] |
| Apparent magnitude (V) | 5.73[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1V[4] |
| B−V color index | −0.002±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | +1.90[5] km/s |
| Proper motion (μ) | RA: −12.639[2] mas/yr Dec.: −27.567[2] mas/yr |
| Parallax (π) | 8.4332±0.0867 mas[2] |
| Distance | 387 ± 4 ly (119 ± 1 pc) |
| Absolute magnitude (MV) | +0.57[1] |
| Details | |
| Mass | 2.59±0.03[3] M☉ |
| Radius | 3.0[6] R☉ |
| Luminosity | 74.1+11.0 −20.5[7] L☉ |
| Surface gravity (log g) | 4.18[7] cgs |
| Temperature | 9,683+89 −178[3] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotational velocity (v sin i) | 51.6±2.2[7] km/s |
| Age | 386[8] Myr |
| Other designations | |
| ι1 Cyg, 7 Cygni, BD+52°2434, HD 183534, HIP 95656, HR 7408, SAO 31673[9] | |
| Database references | |
| SIMBAD | data |
This is a candidate double-lined spectroscopic binary system.[7] It has a stellar classification of A1V,[4] suggesting the primary component is an A-type main-sequence star. The star is about 400 million years old[8] with a moderate rotation rate, showing a projected rotational velocity of 52 km/s.[7] It has 2.6 times the mass of the Sun[3] and is radiating 74 times the Sun's luminosity[7] from its photosphere at an effective temperature of 9,683 K.[3]