19 Lyncis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| 19 Lyn A | |
| Right ascension | 07h 22m 52.05811s |
| Declination | +55° 16′ 53.0226″ |
| Apparent magnitude (V) | 5.80 |
| 19 Lyn B | |
| Right ascension | 07h 22m 50.84965s |
| Declination | +55° 17′ 03.54920″ |
| Apparent magnitude (V) | 6.86 |
| Characteristics | |
| 19 Lyn A | |
| Spectral type | B8 V |
| B−V color index | −0.078±0.005 |
| 19 Lyn B | |
| Spectral type | B9 V |
| B−V color index | −0.051±0.008 |
| Astrometry | |
| 19 Lyn A | |
| Radial velocity (Rv) | 5.2±2 km/s |
| Proper motion (μ) | RA: −2.806 mas/yr Dec.: −31.485 mas/yr |
| Parallax (π) | 4.7743±0.1525 mas |
| Distance | 680 ± 20 ly (209 ± 7 pc) |
| 19 Lyn B | |
| Radial velocity (Rv) | 10.00±3.7 km/s |
| Proper motion (μ) | RA: −2.612 mas/yr Dec.: −30.802 mas/yr |
| Parallax (π) | 4.6939 ± 0.0784 mas |
| Distance | 690 ± 10 ly (213 ± 4 pc) |
| Orbit | |
| Primary | 19 Lyn Aa |
| Companion | 19 Lyn Ab |
| Period (P) | 2.2596 d |
| Eccentricity (e) | 0.08 |
| Longitude of the node (Ω) | 126.1° |
| Periastron epoch (T) | 2,419,031.632 JD |
| Semi-amplitude (K1) (primary) | 106.4 km/s |
| Semi-amplitude (K2) (secondary) | 199.1 km/s |
| Details | |
| 19 Lyn A | |
| Mass | 3.33±0.14 M☉ |
| Luminosity | 166.0+41.5 −33.3 L☉ |
| Temperature | 12,078+84 −83 K |
| Rotational velocity (v sin i) | 70 km/s |
| 19 Lyn B | |
| Mass | 3.03±0.14 M☉ |
| Luminosity | 127.9+32.1 −25.6 L☉ |
| Temperature | 10,691+49 −50 K |
| Rotational velocity (v sin i) | 275 km/s |
| Other designations | |
| 19 Lyn, BD+55°1192, CCDM J07228+5518, WDS J07229+5517 | |
| 19 Lyn A: HD 57103, HIP 35785, HR 2784, SAO 26312 | |
| 19 Lyn B: GC 9799, HD 57102, HIP 35783, HR 2783, SAO 26311 | |
| Database references | |
| SIMBAD | 19 Lyn A |
| 19 Lyn B | |
19 Lyncis is a triple star system in the northern constellation of Lynx. A telescope reveals it consists of two blue-white hued stars of magnitudes 5.80 and 6.86 that are 14.750 arcseconds apart, with a visual companion of magnitude 7.6 that is 3.5 arcminutes distant. The first two are located around 680–690 light years away from the Sun, based on parallax measurements. Their radial velocity measurements are poorly constrained, but suggest the system is trending away from the Earth.
The primary, designated component A, is itself a double-lined spectroscopic binary system with an orbital period of 2.26 days and an eccentricity of 0.08. The more prominent member of this pair, component Aa, is a B-type main-sequence star with a stellar classification of B8 V. It has 3.33 times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s. Component B has a class of B9 V, an estimated 3.03 times the mass of the Sun, and is spinning rapidly with a projected rotational velocity of 275 km/s.