Iota Leporis
Star in the constellation Lepus
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Iota Leporis (ι Leporis) is a triple star[4] system in the southern constellation of Lepus. It is visible to the naked eye as a point source of blue-white light with an apparent visual magnitude of 4.45.[2] Based upon an annual parallax shift of 14.07 mas as measured from Earth,[1] the system is located roughly 232 light years from the Sun.
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 12m 17.90190s[1] |
| Declination | −11° 52′ 09.1863″[1] |
| Apparent magnitude (V) | 4.45[2] |
| Characteristics | |
| Spectral type | B7.5 Vn[3] + K7.2 XR? + G8 Ve[4] |
| U−B color index | −0.40[2] |
| B−V color index | −0.10[2] |
| Astrometry | |
| Radial velocity (Rv) | +23.50[5] km/s |
| Proper motion (μ) | RA: +24.39[1] mas/yr Dec.: −31.02[1] mas/yr |
| Parallax (π) | 14.07±0.16 mas[1] |
| Distance | 232 ± 3 ly (71.1 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.01[6] |
| Details | |
| ι Lep A | |
| Mass | 3.37±0.02[7] M☉ |
| Luminosity | 153[7] L☉ |
| Surface gravity (log g) | 4.25[8] cgs |
| Temperature | 13,781±469[8] K |
| Rotational velocity (v sin i) | 185[8] km/s |
| Age | 94[6] Myr |
| Other designations | |
| ι Lep, 3 Lep, BD−12°1095, GC 6374, HD 33802, HIP 24244, HR 1696, SAO 150223, CCDM J05123-1152A, WDS J05123-1152A[9] | |
| Database references | |
| SIMBAD | data |
The primary, designated component A, is a B-type main-sequence star with a stellar classification of B7.5 Vn,[3] where the 'n' suffix indicates "nebulous" absorption lines caused by rotation. It is about 94[6] million years old and has a high rate of spin with a projected rotational velocity of 185 km/s.[8] With an estimated 3.4[7] times the mass of the Sun, it is radiating 153[7] times the Sun's luminosity from its photosphere at an effective temperature of around 13,781 K.[8]
There is a close companion that is a source of X-ray emission. Most likely this star has at least 1.05 times the mass of the Sun.[6] The third component, AM Leporis, is a BY Draconis variable[11] of apparent magnitude 9.92,[2] and spectral type G8Ve[12] at an angular separation of 12.7".[13]