2 Lyncis
Location of 2 Lyncis (circled in red) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 19m 37.38458s[1] |
| Declination | +59° 00′ 39.4683″[1] |
| Apparent magnitude (V) | 4.44[2] |
| Characteristics | |
| Spectral type | A2 Vs[3] |
| B−V color index | 0.032±0.004[2] |
| Variable type | Eclipsing binary[4] |
| Astrometry | |
| Radial velocity (Rv) | −2.0±0.1[5] km/s |
| Proper motion (μ) | RA: −5.35[1] mas/yr Dec.: +23.86[1] mas/yr |
| Parallax (π) | 20.83±0.40 mas[1] |
| Distance | 157 ± 3 ly (48.0 ± 0.9 pc) |
| Absolute magnitude (MV) | 1.03[2] |
| Orbit[6] | |
| Period (P) | 1306.82±0.96 d |
| Eccentricity (e) | 0.497±0.010 |
| Periastron epoch (T) | 2450962.0±2.0 |
| Argument of periastron (ω) (secondary) | 186.30±0.79° |
| Semi-amplitude (K1) (primary) | 3.281±0.044 km/s |
| Details[6] | |
| 2 Lyn A | |
| Mass | 2.32±0.02[3] M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 39.5+1.8 −1.7[3] L☉ |
| Surface gravity (log g) | 4.1±0.1 cgs |
| Temperature | 9,310±100 K |
| Rotation | 1.56 d |
| Rotational velocity (v sin i) | 44 km/s |
| 2 Lyn B | |
| Mass | 0.46 M☉ |
| Other designations | |
| 2 Lyn, UZ Lyn, BD+59°959, FK5 237, HD 43378, HIP 30060, HR 2238, SAO 25665[7] | |
| Database references | |
| SIMBAD | data |
2 Lyncis is a binary star system in the northern constellation Lynx. It is visible to the naked eye, having an apparent visual magnitude of 4.44.[2] The distance to this system, judging by an annual parallax shift of 20.83±0.40 mas,[1] is around 157 light years. It is moving closer to the Sun with a heliocentric radial velocity of −2 km/s.[5]
This is a spectroscopic binary star system with an orbital period of around 3.6 years and an eccentricity of 0.5. It is classified as a probable (91% chance) eclipsing binary with the variable star designation UZ Lyn, showing a net magnitude decrease of 0.3 during an occultation.[4]
The primary component is an A-type main-sequence star[6] with a stellar classification of A2 Vs,[3] where the 's' indicates narrow (sharp) absorption lines. The orbiting companion may be the source of the X-ray emission from this system, as stars similar to the primary component do not generally produce detectable levels of X-rays.[8]
References
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- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
