| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 14h16m 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]or99.4±2.4[1] R☉ |
| Luminosity | 1,545±46[10]or2,926+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 | |
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 | |
| 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 velocityof−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 temperatureof4,426 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 velocityof5.6 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]
