| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h47m 59.13595s[2] |
| Declination | +20° 13′ 08.1500″[2] |
| Apparent magnitude (V) | 4.522[3] |
| Characteristics | |
| Spectral type | G5III + A7V[4] |
| U−B color index | +0.28[5] |
| B−V color index | +0.9 / +0.2[4] |
| Variable type | RS CVn[6] |
| Astrometry | |
| Radial velocity (Rv) | 0.750 ± 0.05[7] km/s |
| Proper motion (μ) | RA: −145.49[2] mas/yr Dec.: −4.34[2] mas/yr |
| Parallax (π) | 14.02 ± 0.23 mas[2] |
| Distance | 233 ± 4 ly (71 ± 1 pc) |
| Absolute bolometric magnitude (Mbol) | 0.48 / 1.27[4] |
| Orbit[4] | |
| Period (P) | 71.69 d |
| Semi-major axis (a) | 7.5±0.1 mas |
| Eccentricity (e) | 0 |
| Inclination (i) | 50.1±0.5° |
| Longitude of the node (Ω) | 138±1° |
| Periastron epoch (T) | JD 2447642.6 ± 0.2 |
| Argument of periastron (ω) (secondary) | 0° |
| Semi-amplitude (K1) (primary) | 29.67±0.29 km/s |
| Semi-amplitude (K2) (secondary) | 33.8±2.1 km/s |
| Details[4] | |
| 93 Leo A | |
| Mass | 2.25±0.29 M☉ |
| Radius | 9.1±0.5 R☉ |
| Luminosity | 49.4±3.4 L☉ |
| Temperature | 5,100±100 K |
| 93 Leo B | |
| Mass | 1.97±0.15 M☉ |
| Radius | 2.7±0.2 R☉ |
| Luminosity | 23.9±1.9 L☉ |
| Temperature | 7,800±200 K |
| Other designations | |
DQ Leo, BD+21°2358, FK5 1304, HD 102509, HIP 57565, HR 4527, SAO 81998[6] | |
| Database references | |
| SIMBAD | data |
93 Leonis (93 Leo) is a binary star in the constellation Leo. Its apparent magnitude is 4.522.[3] Based on the system's parallax, 93 Leonis is located about 233 light-years (71 parsecs) away.[2]
93 Leonis is a double-lined spectroscopic binary. Two components are known to exist, because their spectral lines shift periodically, due to the Doppler effect. The two stars are a G-type red giant and an A-type main-sequence star.[4] They complete an orbit once every 71.69 days. The system is also known to be an RS Canum Venaticorum variable, due to its binarity.[6] For that reason, it has been given the variable star designation DQ Leonis.[6]
InChinese astronomy, 93 Leonis is called 太子, Pinyin: Tàizǐ, meaning Crown Prince, because this star is marking itself and stand alone in Crown Prince asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[8]
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