17 Cygni
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 46m 25.60019s[1] |
| Declination | +33° 43′ 39.3452″[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Spectral type | F7 V[2] + M0.4[3] |
| B−V color index | 0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.1[4] km/s |
| Proper motion (μ) | RA: +23.25[1] mas/yr Dec.: –449.31[1] mas/yr |
| Parallax (π) | 47.10 ± 0.26[1] mas |
| Distance | 69.2 ± 0.4 ly (21.2 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.40[2] |
| Details | |
| 17 Cyg A | |
| Radius | 0.95–1.1[5] R☉ |
| Luminosity | 3.66[6] L☉ |
| Surface gravity (log g) | 4.262[6] cgs |
| Temperature | 6,455[6] K |
| Metallicity [Fe/H] | 0.027[6] dex |
| Rotational velocity (v sin i) | 9[2] km/s |
| Age | 2.8[7] Gyr |
| Other designations | |
17 Cygni is the Flamsteed designation for a binary star system in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.00,[2] so, according to the Bortle scale, it is visible from suburban skies at night. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.04710″,[1] which is equivalent to a distance of around 69.2 ly (21.2 pc) from the Sun.
The stellar classification of the primary star is F7 V,[2] which means it is a main sequence star like the Sun. It is some 2.8[7] billion years old and shines with 3.66[6] times the Sun's luminosity. The effective temperature of the stellar atmosphere is 6,455[6] K, giving it the yellow-white hued glow of an F-type star.[9]
At an angular separation of 791.40 arcseconds is a proper motion companion with a classification of M0.4, indicating this is a red dwarf star. At the estimated distance of the pair, this is equal to a projected separation of 16,320 AU.[3] Although the CCDM lists four other companions, these are not associated with the pair.[10]
References
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19h 46m 25.60s, +33° 43′ 39.35″
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- ↑ Lua error in package.lua at line 80: module 'strict' not found. See the note for F094.
