HD 219623

HD 219623
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 16m 42.304s[1]
Declination +53° 12′ 48.51″[1]
Apparent magnitude (V) 5.58[2]
Characteristics
Evolutionary stage Main sequence
Spectral type F7 V[3]
U−B color index +0.02[4]
B−V color index +0.556±0.003[2]
Astrometry
Radial velocity (Rv)−27.2[5] km/s
Proper motion (μ) RA: 112.461 mas/yr[1]
Dec.: −236.554 mas/yr[1]
Parallax (π)48.5197 ± 0.0463 mas[1]
Distance67.22 ± 0.06 ly
(20.61 ± 0.02 pc)
Absolute magnitude (MV)4.02[2]
Details
Mass1.215[6] M☉
Radius1.1950±0.0359[6] R☉
Luminosity1.9987±0.0265[6] L☉
Surface gravity (log g)4.24±0.07[7] cgs
Temperature6,138±42[7] K
Metallicity [Fe/H]+0.07±0.03[7] dex
Rotational velocity (v sin i)5.50[8] km/s
Age1.2[6] Gyr
Other designations
BD+52°3410, GJ 4324, HD 219623, HIP 114924, HR 8853, SAO 35285[9]
Database references
SIMBADdata

HD 219623 is a solitary star in the northern circumpolar constellation of Cassiopeia.[10] HD 219623 is its Henry Draper Catalogue designation. It has an apparent visual magnitude of 5.59,[4] which lies in the brightness range that is visible to the naked eye. According to the Bortle scale, it can be observed from dark suburban skies. Parallax measurements place it at an estimated distance of around 67.2 light years.[1] It has a relatively high proper motion, advancing 262 mas per year across the celestial sphere.[11]

This star has a stellar classification of F7 V,[3] indicating that it is an F-type main-sequence star that is generating energy at its core through the thermonuclear fusion of hydrogen into helium. It is larger than the Sun, with 120% of the Sun's radius and 122% of the solar mass; as such, it shines nearly twice as brightly as the Sun. HD 219623 is around 1.2 billion years in age,[6] with a projected rotational velocity of 5.5 km/s.[8] Compared to the Sun, it has a slightly higher abundance of elements other than hydrogen and helium—what astronomers term the star's metallicity.[7] The effective temperature of the stellar atmosphere is about 6,138 K,[7] giving it the yellow-white hued glow of an ordinary F-type star.[12]

In 2006, this star was examined using the MIPS instrument on the Spitzer Space Telescope. An infrared excess at a wavelength of 70 μm was detected with 3-σ certainty. The data suggests the presence of circumstellar disk of orbiting dust,[13] which is likely being replenished via debris from comets or asteroids. The temperature of this dust indicates the inner edge of the disk annulus comes to within 0.4 AU of the host star, while the outer edge extends out to around 22 AU.[14]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aaa508_3_1313 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Nordström2004 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference apj771_1_40 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference prugniel2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference aa547_A106 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Helmut2006 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference lepine2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference beichman2006 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference lawler2009 was invoked but never defined (see the help page).