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] |
Distance | 2,030 ± 20 ly (621 ± 8 pc) |
Absolute magnitude (MV) | −2.10[8] |
Details | |
Mass | 4.22[9] M☉ |
Radius | 71.4+3.2 −13.5[10] or 99.4±2.4[1] R☉ |
Luminosity | 1,545±46[10] or 2,926+74 −75[1] L☉ |
Surface gravity (log g) | 1.29[9] cgs |
Temperature | 4,426±122[11] K |
Metallicity [Fe/H] | −0.21[12] dex |
Rotational velocity (v sin i) | 5.6±2.0[13] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]