1 Lyncis
Red giant star in the constellation Lynx
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1 Lyncis is a single[5] star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95.[3] It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 17m 54.81907s[2] |
| Declination | +61° 30′ 55.0251″[2] |
| Apparent magnitude (V) | 4.95[3] |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch[4] |
| Spectral type | M3IIIab[5] |
| U−B color index | +1.96[3] |
| B−V color index | +1.83[3] |
| Variable type | Lb?[6] |
| Astrometry | |
| Radial velocity (Rv) | +11.56±0.44[7] km/s |
| Proper motion (μ) | RA: −10.59±0.36[2] mas/yr Dec.: −3.11±0.29[2] mas/yr |
| Parallax (π) | 5.11±0.33 mas[2] |
| Distance | 640 ± 40 ly (200 ± 10 pc) |
| Absolute magnitude (MV) | −1.44[8] |
| Details | |
| Radius | 156[9] R☉ |
| Luminosity | 2,848[10] L☉ |
| Temperature | 3,485[10] K |
| Other designations | |
| 1 Lyn, UW Lyn, BD+61°869, FK5 2479, HD 42973, HIP 29919, HR 2215, SAO 13787[11] | |
| Database references | |
| SIMBAD | data |
The star is an aging red giant of spectral type M3IIIab,[5] currently on the asymptotic giant branch,[4] having exhausted the hydrogen at its core and evolved away from the main sequence. It has been classified as a possible slow irregular variable,[6] after being found to be slightly variable in 1969 by Olin J. Eggen.[12] Its changes in brightness are complex, with two shorter changeable periods of 35–40 and 47–50 days due to the star's pulsations, and a longer period of 1,500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.[13] The star has expanded to 156[9] times the Sun's radius and it is radiating 2,848[10] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,485 K.[10]