Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 29m 42.36s [1] |
Declination | +51° 43′ 47.2″ [1] |
Apparent magnitude (V) | 3.76 [2] |
Characteristics | |
Spectral type | A5V [3] |
B−V color index | +0.148±0.001 [2] |
Astrometry | |
Radial velocity (Rv) | −19.5±2.7 [2] km/s |
Proper motion (μ) |
RA: +20.59
[1]
mas/
yr Dec.: +128.33 [1] mas/ yr |
Parallax (π) | 26.88 ± 0.11 mas [1] |
Distance | 121.3 ± 0.5
ly (37.2 ± 0.2 pc) |
Absolute magnitude (MV) | +0.91 [2] |
Details | |
Mass | 1.80 [4] M☉ |
Radius | 3.83+0.40 −0.36 [5] R☉ |
Luminosity | 34.5±0.5 [5] L☉ |
Surface gravity (log g) | 3.91 [4] cgs |
Temperature | 8,216±279 [4] K |
Rotational velocity (v sin i) | 240 [6] km/s |
Age | 577 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Iota2 Cygni, Latinized from ι2 Cygni and often simply called ι Cygni, [8] is a single [9] star in the constellation Cygnus. It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.76. [2] Located around 121.3 light-years distant from the Sun based on parallax, [1] it is drifting closer with a radial velocity of −19.5 km/s and is expected to come to within 92 light-years in around 783,000 years. [2]
This it is an A-type main-sequence star with a stellar classification of A5V, [3] a star that is currently fusing its core hydrogen. It is around 577 [4] million years old and is spinning rapidly with a projected rotational velocity of 240 km/s. [6] The star has 1.8 [4] times the mass of the Sun and 3.8 [5] times the Sun's radius. It is radiating 35 [5] times the luminosity of the Sun from its photosphere at an effective temperature of 8,216 K. [4] Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk. [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 29m 42.36s [1] |
Declination | +51° 43′ 47.2″ [1] |
Apparent magnitude (V) | 3.76 [2] |
Characteristics | |
Spectral type | A5V [3] |
B−V color index | +0.148±0.001 [2] |
Astrometry | |
Radial velocity (Rv) | −19.5±2.7 [2] km/s |
Proper motion (μ) |
RA: +20.59
[1]
mas/
yr Dec.: +128.33 [1] mas/ yr |
Parallax (π) | 26.88 ± 0.11 mas [1] |
Distance | 121.3 ± 0.5
ly (37.2 ± 0.2 pc) |
Absolute magnitude (MV) | +0.91 [2] |
Details | |
Mass | 1.80 [4] M☉ |
Radius | 3.83+0.40 −0.36 [5] R☉ |
Luminosity | 34.5±0.5 [5] L☉ |
Surface gravity (log g) | 3.91 [4] cgs |
Temperature | 8,216±279 [4] K |
Rotational velocity (v sin i) | 240 [6] km/s |
Age | 577 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Iota2 Cygni, Latinized from ι2 Cygni and often simply called ι Cygni, [8] is a single [9] star in the constellation Cygnus. It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.76. [2] Located around 121.3 light-years distant from the Sun based on parallax, [1] it is drifting closer with a radial velocity of −19.5 km/s and is expected to come to within 92 light-years in around 783,000 years. [2]
This it is an A-type main-sequence star with a stellar classification of A5V, [3] a star that is currently fusing its core hydrogen. It is around 577 [4] million years old and is spinning rapidly with a projected rotational velocity of 240 km/s. [6] The star has 1.8 [4] times the mass of the Sun and 3.8 [5] times the Sun's radius. It is radiating 35 [5] times the luminosity of the Sun from its photosphere at an effective temperature of 8,216 K. [4] Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk. [10]