Chi Cygni
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| Observation data Epoch J2000 |
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| Constellation (pronunciation) |
Cygnus |
| Right ascension | 19h 50m 33.922s |
| Declination | +32° 54' 50.61"' |
| Apparent magnitude (V) | 6.8 |
| Characteristics | |
| Spectral type | S |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | Variable Star of Mira Cet type |
| Astrometry | |
| Radial velocity (Rv) | -1.9 km/s |
| Proper motion (μ) | RA: -23.57 mas/yr Dec.: -38.49 mas/yr |
| Parallax (π) | 9.43 ± 1.36 mas |
| Distance | approx. 350 ly (approx. 110 pc) |
| Absolute magnitude (MV) | 8.35 |
| Details | |
| Mass | ? M☉ |
| Radius | 150 R☉ |
| Surface gravity (log g) | ? |
| Luminosity | 0.4 - 10 000 L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | 470 days |
| Age | ? years |
| Other designations | |
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V* chi Cyg, IRC +30395, TYC 2673-4643-1, chi Cyg, GSC 02673-04643, JP11 3144, UBV 21439, AG+32° 1840, HD 187796, 2MASS J19503392+3254509, BD+32° 3593, Hen 4-220, PLX 4673, CCDM J19505+3254A, HIC 97629, PPM 83661, CSI+32° 3593 1, HIP 97629, RAFGL 2465, CSS 1165, HR 7564, S1* 625, [WCP90] 194838.470+324710.06, GC 27481, IDS 19468+3240 A, SAO 68943, AAVSO 1946+32, GCRV 12201, IRAS 19486+3247.
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| Database references | |
| SIMBAD | data |
Chi Cygni (χ Cyg / χ Cygni) is a variable star of the Mira type in the constellation Cygnus.
Chi Cygni shows one of the largest variations in magnitude known. Typically it brightens and fades from 5th to 13th magnitude. The average period of this brightness fluctuation is 407 days. Observed extremes were 3.3 and 14.3 respectively. Thus Chi Cygni is visible at its minimum only with telescopes larger than 30 centimeters, while at maximum brightness is easily visible to the naked eye. Its distance is approximately 345 light years. The astronomer Gottfried Kirch discovered its variability in 1686.
[edit] References
Robert Burnham Jr.: Burnham's Celestial Handbook, Volume Two, p. 762
[edit] External links
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