19 Lyncis

19 Lyncis
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
19 Lyn A
Right ascension 07h 22m 52.05811s[1]
Declination +55° 16′ 53.0226″[1]
Apparent magnitude (V) 5.80[2]
19 Lyn B
Right ascension 07h 22m 50.84965s[3]
Declination +55° 17′ 03.54920″[3]
Apparent magnitude (V) 6.86[2]
Characteristics
19 Lyn A
Spectral type B8 V[4]
B−V color index −0.078±0.005[2]
19 Lyn B
Spectral type B9 V[4]
B−V color index −0.051±0.008[2]
Astrometry
19 Lyn A
Radial velocity (Rv)5.2±2[5] km/s
Proper motion (μ) RA: −2.806[1] mas/yr
Dec.: −31.485[1] mas/yr
Parallax (π)4.7743 ± 0.1525 mas[1]
Distance680 ± 20 ly
(209 ± 7 pc)
19 Lyn B
Radial velocity (Rv)10.00±3.7[6] km/s
Proper motion (μ) RA: −2.612[3] mas/yr
Dec.: −30.802[3] mas/yr
Parallax (π)4.6939 ± 0.0784 mas[3]
Distance690 ± 10 ly
(213 ± 4 pc)
Orbit[7]
Primary19 Lyn Aa
Companion19 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
Mass3.33±0.14[8] M☉
Luminosity166.0+41.5
−33.3[8] L☉
Temperature12,078+84
−83[8] K
Rotational velocity (v sin i)70[8] km/s
19 Lyn B
Mass3.03±0.14[8] M☉
Luminosity127.9+32.1
−25.6[8] L☉
Temperature10,691+49
−50[8] K
Rotational velocity (v sin i)275[8] 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[9]
19 Lyn B: GC 9799, HD 57102, HIP 35783, HR 2783, SAO 26311[10]
Database references
SIMBAD19 Lyn A
19 Lyn B

19 Lyncis is a triple star[11] 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[2] that are 14.750 arcseconds[11] apart, with a visual companion of magnitude 7.6 that is 3.5 arcminutes distant.[12] 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.[7] The more prominent member of this pair, component Aa, is a B-type main-sequence star with a stellar classification of B8 V.[4] It has 3.33[8] times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s.[8] Component B has a class of B9 V,[4] an estimated 3.03 times the mass of the Sun, and is spinning rapidly with a projected rotational velocity of 275 km/s.[8]

  1. ^ a b c d e Cite error: The named reference GaiaDR2A was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference GaiaDR2B was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference murphy1969 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference GCRV was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Kharchenko was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h i j k Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SimbadA was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SimbadB was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Eggleton was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Monks2010 was invoked but never defined (see the help page).