12 Boötis

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Template:About-distinguish Template:Short description

12 Boötis
Template:Location mark
Location of 12 Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.83[2]
Characteristics
Spectral type F9IVw[3]
U−B Template:Engvar +0.07[2]
B−V Template:Engvar +0.54[2]
Astrometry
Radial velocity (Rv)Template:Val[4] km/s
Proper motion (μ) RA: −23.43[1] mas/yr
Dec.: −59.79[1] mas/yr
Parallax (π)27.917±0.044 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)2.00[5]
Orbit[4]
Primary12 Boo Aa
Companion12 Boo Ab
Period (P)Template:Val d
Semi-major axis (a)Template:Val mas
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Semi-amplitude (K1)
(primary)		Template:Val km/s
Semi-amplitude (K2)
(secondary)		Template:Val km/s
Details
12 Boo Aa
MassTemplate:Val[4] Template:Solar mass
Radius2.450[6] Template:Solar radius
Luminosity7.531 Template:Solar luminosity
Surface gravity (log g)3.73[5] cgs
Temperature6115[6] K
Metallicity [Fe/H]−0.065[4] dex
12 Boo Ab
MassTemplate:Val[4] Template:Solar mass
Radius1.901[6] Template:Solar radius
Luminosity4.692[6] Template:Solar luminosity
Temperature6200[6] K
Metallicity [Fe/H]−0.065[6] dex
Other designations
d Boötis, 12 Boötis, FK5 522, GC 19127, HIP 69226, HR 5304, HD 123999, GJ 9470, BD+25°2737, SAO 83203, WDS J14104+2506AB, CCDM 14104+2505
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

12 Boötis is a spectroscopic binary[7] in the constellation Boötes. It is approximately 122 light years from Earth.[1]

12 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.82. It is a spectroscopic binary pair which orbit around its centre of mass once every 9.6045 days,[3] with an estimated separation of 0.0035".[8] The two stars have similar masses around Template:Solar mass, both are slightly hotter than the Sun and about twice as large.[4]

A further companion, 12 Boötis B, was reported with a separation of approximately one arcsecond in 1989, but subsequent surveys have repeatedly failed to detect this companion.[3]

References

Template:Reflist

See also

Template:Stars of Boötes

  1. ↑ a b c d e Script error: No such module "Citation/CS1". Vizier catalog entry
  2. ↑ a b c Script error: No such module "Citation/CS1".
  3. ↑ a b c Script error: No such module "Citation/CS1". Vizier catalog entry
  4. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
  6. ↑ a b c d e f Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1". Vizier catalog entry
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