Kappa1 Sagittarii

For other stars with this Bayer designation, see κ Sagittarii.
κ1 Sagittarii
Location of κ1 Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 20h 22m 27.50366s[1]
Declination −42° 02′ 58.3648″[1]
Apparent magnitude (V) +5.58[2]
Characteristics
Spectral type A0 V[3]
U−B color index −0.008[2]
B−V color index +0.004[2]
Astrometry
Radial velocity (Rv)−11.6[4] km/s
Proper motion (μ) RA: +41.312[5] mas/yr
Dec.: −83.742[5] mas/yr
Parallax (π)14.6086 ± 0.1738 mas[5]
Distance223 ± 3 ly
(68.5 ± 0.8 pc)
Absolute magnitude (MV)1.47[6]
Details
Mass2.23±0.02[7] M☉
Radius1.7[8] R☉
Luminosity27.5[7] L☉
Surface gravity (log g)4.33[9] cgs
Temperature9,962±339[9] K
Rotational velocity (v sin i)79[3] km/s
Age161[9] Myr
Other designations
κ1 Sgr, CD−42°14836, HD 193571, HIP 100469, HR 7779, SAO 230177, WDS J20225-4203[10]
Database references
SIMBADdata

Kappa1 Sagittarii (κ1 Sagittarii) is a solitary,[11] white-hued star in the zodiac constellation of Sagittarius. It has an apparent visual magnitude of +5.58,[2] which is bright enough to be faintly visible to the naked eye. According to the Bortle scale, it can be viewed from dark suburban skies. Based upon an annual parallax shift of 15.12 mas as seen from Earth,[1] this star is located around 223 light years from the Sun. It is advancing in the general direction of the Sun with a radial velocity of −11.6 km/s.[4]

This is an A-type main sequence star with a stellar classification of A0 V.[3] It displays an infrared excess, with the measured radiation indicating the star is orbited by a two-component debris disk.[8] The star is about 161[9] million years old with 2.23[7] times the mass of the Sun and 1.7[8] times the Sun's radius. It is radiating 27.5 times the Sun's luminosity from its photosphere at an effective temperature of roughly 9,962 K.[9]

There are two visual companions: component B is a magnitude 12.6 star at an angular separation of 39.3 arc seconds along a position angle of 312°, as of 2000; component C is magnitude 11.6 with a separation of 56.8 arc seconds along a position angle of 283°, as of 1999.[12] Neither star is physically associated with Kappa1 Sagittarii.[11]

  1. ^ a b c Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Cousins1983 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Evans1966 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Patel2017 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).