HD 124099

HD 124099
Location of HD 124099 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 16m 55.14838s[1]
Declination −77° 39′ 51.1971″[1]
Apparent magnitude (V) 6.47[2] (6.46 - 6.49)[3]
Characteristics
Spectral type K2 IIp[4]
U−B color index +1.33[5]
B−V color index +1.42[6]
Variable type SRD:[3]
Astrometry
Radial velocity (Rv)−10.2±0.4[7] km/s
Proper motion (μ) RA: −4.602 mas/yr[1]
Dec.: −3.712 mas/yr[1]
Parallax (π)1.6098 ± 0.0195 mas[1]
Distance2,030 ± 20 ly
(621 ± 8 pc)
Absolute magnitude (MV)−2.10[8]
Details
Mass4.22[9] M☉
Radius71.4+3.2
−13.5[10] or 99.4±2.4[1] R☉
Luminosity1,545±46[10] or 2,926+74
−75[1] L☉
Surface gravity (log g)1.29[9] cgs
Temperature4,426±122[11] K
Metallicity [Fe/H]−0.21[12] dex
Rotational velocity (v sin i)5.6±2.0[13] km/s
Other designations
7 G. Apodis[14], NSV 20066[3], CD−77°643, CPD−77°940, GC 19200, HD 124099, HIP 69778, HR 5306, SAO 257131[15]
Database references
SIMBADdata

HD 124099 (HR 5306; NSV 20066; 7 G. Apodis) is a solitary orange-hued star located in the southern circumpolar constellation Apus. It has an average apparent magnitude of 6.47,[2] placing it very close to the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of approximately 2,030 light-years based on Gaia DR3 parallax measurements,[1] but it is drifting closer with a heliocentric radial velocity of −10.2 km/s.[7] At its current distance, HD 124099's average brightness is diminished by 0.47 magnitudes due to interstellar extinction[16] and it has an absolute magnitude of −2.10.[8]

HD 124099 has a stellar classification of K2 IIp,[4] indicating that it is an evolved K-type bright giant with peculiarities in its spectrum; the peculiarity being that it has either a very weak or no G-band in its spectrum. It has 4.22 times the mass of the Sun[9] but it has expanded to 71.4 times the radius of the Sun.[10] It radiates 1,545 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,426 K.[11] However, Gaia DR3 stellar evolution models give a larger radius of 99.4 R☉ and a higher luminosity of 2,926 L☉.[1] HD 124099 is metal deficient with an iron abundance 61.2% that of the Sun's ([Fe/H] = −0.21)[12] and it spins modestly with a projected rotational velocity of 5.6 km/s.[13] The star is suspected to be a semiregular variable of the SRD subtype and it ranges from 6.46 to 6.49 within 528 days.[3]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference VSX was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Stagg1983 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cousins1962 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Corbally1984 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Poggio2022 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Guarinos1995 was invoked but never defined (see the help page).