HD 93833
Star in the constellation Sextans
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HD 93833 (HR 4233; 73 G. Sextantis) is a solitary star located in the equatorial constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.84.[3] Gaia DR2 parallax measurements imply a distance of 345 light-years[2] and it receding with a heliocentric radial velocity of 40.3 km/s.[7] At its current distance, HD 93833's brightness is diminished by an interstellar extinction of 0.18 magnitudes[14] and it has an absolute magnitude of +0.76.[1]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sextans[1] |
| Right ascension | 10h 49m 43.49171s[2] |
| Declination | −09° 51′ 09.6859″[2] |
| Apparent magnitude (V) | 5.84±0.01[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | K0 III[5] |
| U−B color index | +0.91[6] |
| B−V color index | +1.07[6] |
| Astrometry | |
| Radial velocity (Rv) | 40.3±2.9[7] km/s |
| Proper motion (μ) | RA: +5.882 mas/yr[2] Dec.: −30.041 mas/yr[2] |
| Parallax (π) | 9.4637±0.1343 mas[2] |
| Distance | 345 ± 5 ly (106 ± 1 pc) |
| Absolute magnitude (MV) | +0.76[1] |
| Details | |
| Mass | 1.40[8] M☉ |
| Radius | 10.7±0.5[9] R☉ |
| Luminosity | 60.4±1.0[2] L☉ |
| Surface gravity (log g) | 2.46[10] cgs |
| Temperature | 4,675±22[10] K |
| Metallicity [Fe/H] | −0.11±0.09[11] dex |
| Age | 5.50[8] Gyr |
| Other designations | |
| 73 G. Sextantis[12], BD−09°3147, GC 14900, HD 93833, HIP 52948, HR 4233, SAO 137815, TIC 55109651[13] | |
| Database references | |
| SIMBAD | data |
HD 93833 has a stellar classification of K0 III,[5] indicating that it is an evolved K-type giant star that has exhausted hydrogen at its core and left the main sequence. It is currently a red clump star that is on the horizontal branch—fusing helium at its core.[4] It has 1.4 times the mass of the Sun but at the age of 5.5 billion years,[8] it has expanded to 10.7 times the radius of the Sun.[9] It radiates 60.4 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 4,675 K.[10] HD 93833 is slightly metal deficient with an iron abundance of [Fe/H] = −0.11 or 77.6% of the Sun's abundance.[11]