| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h21m 48.36967s[1] |
| Declination | −36° 15′ 40.9525″[1] |
| Apparent magnitude (V) | 3.58[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.85[2] |
| B−V color index | +1.534±0.005[4] |
| Astrometry | |
| Radial velocity (Rv) | −29.4±0.7[5] km/s |
| Proper motion (μ) | RA: −92.33[1] mas/yr Dec.: −85.67[1] mas/yr |
| Parallax (π) | 11.86 ± 0.16 mas[1] |
| Distance | 275 ± 4 ly (84 ± 1 pc) |
| Absolute magnitude (MV) | −1.55[6] |
| Details | |
| Radius | 40[7] R☉ |
| Luminosity | 711.28[4] L☉ |
| Temperature | 3,894±59[8] K |
| Other designations | |
φ1 Lup, CD−35°10236, FK5 566, HD 136422, HIP 75177, HR 5705, SAO 206552[9] | |
| Database references | |
| SIMBAD | data |
Phi1 Lupi is a solitary[11] star in the southern constellationofLupus. It is visible to the naked eye with an apparent visual magnitude of 3.58.[2] Based upon an annual parallax shift of 11.86 mas as seen from Earth, it is located around 275 light years from the Sun. The star is drifting closer with a radial velocity of −29 km/s.[5] It has an absolute magnitude of −1.55.[6]
This is an evolved K-type giant star with a stellar classification of K5 III,[3] which means it has used up its core hydrogen and has expanded. At present it has 40 times the radius of the Sun.[7] It is a variable star of unknown type, with an amplitude of 0.008 in visual magnitude and a period of 4.82 days.[12] The star is radiating 711[4] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,894 K.[8]
{{cite web}}: CS1 maint: postscript (link)
