Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lynx |
Right ascension | 06h 46m 14.13019s [1] |
Declination | +59° 26′ 30.0227″ [1] |
Apparent magnitude (V) | 4.86 [2] (5.44 / 6.00) [3] |
Characteristics | |
Spectral type | A3V [2] (A1.5V + A2V) [4] |
U−B color index | +0.08 [5] |
B−V color index | +0.084±0.012 [2] |
Astrometry | |
Radial velocity (Rv) | −3.0±4.2 [6] km/s |
Proper motion (μ) |
RA: −19.63
[1]
mas/
yr Dec.: −7.23 [1] mas/ yr |
Parallax (π) | 15.19 ± 0.78 mas [1] |
Distance | 210 ± 10
ly (66 ± 3 pc) |
Absolute magnitude (MV) | 0.77 [2] |
Orbit [3] | |
Period (P) | 907.6 yr |
Semi-major axis (a) | 2.30″ |
Eccentricity (e) | 0.3700 |
Inclination (i) | 134.7° |
Longitude of the node (Ω) | 166.5° |
Periastron epoch (T) | B 2677.4 |
Argument of periastron (ω) (secondary) | 322.6° |
Details | |
12 Lyn A | |
Radius | 2.52 [4] R☉ |
Rotational velocity (v sin i) | 90±30 [4] km/s |
12 Lyn B | |
Radius | 2.44 [4] R☉ |
Rotational velocity (v sin i) | 100±30 [4] km/s |
Other designations | |
Database references | |
SIMBAD | 12 Lyn |
12 Lyn A | |
12 Lyn B |
12 Lyncis, abbreviated 12 Lyn, is a triple star [8] system in the constellation Lynx. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.87. When seen through a telescope, it can be separated into three stars: two components with magnitudes 5.4 and 6.0 that lie at an angular separation by 1.8 ″ (as of 1992) and a yellow-hued star of magnitude 7.2 at a separation of 8.6″ (as of 1990). [9] [10] The orbit of the two brighter stars is not known with certainty, but appears to have a period of somewhere around 700 to 900 years. [11] The pair have a projected separation of 128 AU. [4] Parallax indicates the system is 210±10 light years distant from Earth. [1]