HD 151613

HD 151613
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 16h 45m 17.88121s[1]
Declination +56° 46′ 54.7985″[1]
Apparent magnitude (V) 4.84[2]
Characteristics
Spectral type F2 V[3]
B−V color index 0.375±0.013[2]
Astrometry
Radial velocity (Rv)−2.0[4] km/s
Proper motion (μ) RA: 24.85 mas/yr
Dec.: 67.07 mas/yr
Parallax (π)39.2932 ± 0.3182 mas[1]
Distance83.0 ± 0.7 ly
(25.4 ± 0.2 pc)
Absolute magnitude (MV)2.71[2]
Orbit[5]
Period (P)363.57 d
Eccentricity (e)0.35
Periastron epoch (T)2415232.4 JD
Argument of periastron (ω)
(secondary)		80.7°
Semi-amplitude (K1)
(primary)		6.0 km/s
Details
Mass1.43[4] M☉
Radius1.6[6] R☉
Luminosity6.91[2] L☉
Surface gravity (log g)4.05[4] cgs
Temperature6,630[7] K
Metallicity [Fe/H]−0.23[4] dex
Rotational velocity (v sin i)47.5±2.4[7] km/s
Age2.30[4] Gyr
Other designations
BD+57° 1702, FK5 627, GJ 9578, HD 151613, HIP 82020, HR 6237, SAO 30076, WDS 16453+5647[8]
Database references
SIMBADdata

HD 151613 is a binary star[5] system in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of 4.84.[2] The distance to this star, as estimated from its annual parallax shift of 39.3 mas,[1] is 83 light years. It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.[4]

This is a single-lined spectroscopic binary[3] system with an orbital period of 363.57 days and an eccentricity of 0.35.[5] The pair were resolved through speckle interferometry in 1977, showing an angular separation of 0.041″. They were later resolved in 1981 with a separation of 0.047″, but were unresolved during 20 other attempts between 1976–1991.[9] The system is a source of X-ray emission.[10] The visible component is an F-type main-sequence star with a stellar classification of F2 V.[3] It is around 2.3[4] billion years old with a projected rotational velocity of 48 km/s.[7]

  1. ^ a b c d Cite error: The named reference GaiaDR2 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 Cite error: The named reference abt2009 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cadars2001 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Hartkopf2009 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).