| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 23m 43.08963s[1] |
| Declination | 29° 24′ 03.6265″[1] |
| Apparent magnitude (V) | 9.14 to 10.09[2] |
| Characteristics | |
| Spectral type | A7III[2] |
| Apparent magnitude (U) | 10.287±0.20[3][note 1] |
| Apparent magnitude (B) | 10.097±0.006[3][note 1] |
| Apparent magnitude (V) | 9.692±0.006[3][note 1] |
| Apparent magnitude (Rc) | 9.433±0.020[3][note 1] |
| Apparent magnitude (Ic) | 9.169±0.008[3][note 1] |
| Apparent magnitude (J) | 8.757±0.020[3][note 1] |
| Apparent magnitude (H) | 8.590±0.013[3][note 1] |
| Apparent magnitude (Ks) | 8.511±0.009[3][note 1] |
| Variable type | RRab Lyrae[3] |
| Astrometry | |
| Proper motion (μ) | RA: −6.638(29)[1]mas/yr Dec.: −18.906(26)[1]mas/yr |
| Parallax (π) | 1.77±0.26 mas[1] |
| Distance | approx. 1,800 ly (approx. 560 pc) |
| Absolute magnitude (MV) | 0.710[4] |
| Details[4] | |
| Mass | 0.26±0.04 M☉ |
| Radius | 4.51–5.05 R☉ |
| Luminosity | 39.8±4 L☉ |
| Temperature | 6644 K |
| Other designations | |
| SW And,BD+28 54,HIP 1878,TYC 1737-1702-1,2MASS J00234308+2924036[5] | |
| Database references | |
| SIMBAD | data |


SW Andromedae is avariable star in the constellation ofAndromeda. It is classified as anRR Lyrae star, and varies from anapparent magnitude of 10.09 at minimum brightness to a magnitude of 9.14 at maximum brightness with a period of 0.44226 days.[2] It exhibits theBlazhko effect, and its period is decreasing.[6][7]
The discovery of this star byAnnie Jump Cannon was announced in 1907. 461photographic plates, spanning the time interval from November 14, 1889 through November 16, 1906 were examined, and an initial period of 0.49932 days was derived.[8] SW Andromedae was given itsvariable star designation in 1907.[9]
{{cite journal}}: CS1 maint: multiple names: authors list (link)This variable star–related article is astub. You can help Wikipedia byexpanding it. |