HD 137058 is a star in the southern constellation of Lupus. Eggleton and Tokovinin (2008) list it as a single star,[9] although Nitschelm and David (2011) noted it may be a double-lined spectroscopic binary.[10] Its apparent visual magnitude is 4.60,[2] which is bright enough to be visible to the naked eye. Based upon an annual parallax shift of 13.6 mas,[1] it is located 240 light years away.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 25m 20.20923s[1] |
| Declination | −38° 44′ 00.8803″[1] |
| Apparent magnitude (V) | 4.60[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| B−V color index | 0.000±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.0±2.8[4] km/s |
| Proper motion (μ) | RA: −41.573[1] mas/yr Dec.: −24.603[1] mas/yr |
| Parallax (π) | 13.6178 ± 0.4759 mas[1] |
| Distance | 240 ± 8 ly (73 ± 3 pc) |
| Absolute magnitude (MV) | −0.76[2] |
| Details | |
| Radius | 3.0[5] R☉ |
| Luminosity | 155.71[6] L☉ |
| Temperature | 8,178[6] K |
| Rotational velocity (v sin i) | 300.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of the primary component is A0 V,[3] matching an A-type main-sequence star. It is spinning rapidly with a projected rotational velocity of 300 km/s, giving it an oblate shape with an equatorial radius 22% larger than the polar radius.[7] The star is radiating 156 times the Sun's luminosity from its photosphere at an effective temperature of 8,178 K.[6]
References
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