  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 01h 42m 08.62230s[1] |
| Declination | −32° 19′ 37.2862″[1] |
| Apparent magnitude (V) | 5.25[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K1II/III[4] |
| U−Bcolor index | +0.79[5] |
| B−Vcolor index | +1.05[5] |
| Astrometry | |
| Radial velocity (Rv) | +13.83±0.15[1] km/s |
| Proper motion (μ) | RA: −76.714[1]mas/yr Dec.: +4.521[1]mas/yr |
| Parallax (π) | 15.0534±0.1667 mas[1] |
| Distance | 217 ± 2 ly (66.4 ± 0.7 pc) |
| Absolute magnitude (MV) | 1.16[2] |
| Details | |
| Mass | 1.52[3] M☉ |
| Radius | 9.28+0.30 −2.31[1] R☉ |
| Luminosity | 41.173±0.53[1] L☉ |
| Surface gravity (log g) | 2.69[3] cgs |
| Temperature | 4,800+737 −75[1] K |
| Metallicity[Fe/H] | −0.22[3] dex |
| Rotational velocity (v sin i) | < 1.6[6] km/s |
| Other designations | |
| π Scl,CPD−32°4292,FK5 1048,GC 2085,HD 10537,HIP 7955,HR 497,SAO 193263,GSC 07003-02207[7] | |
| Database references | |
| SIMBAD | data |
π Sculptoris,Latinized asPi Sculptoris, is candidateastrometric binary[8]star system in the southernconstellationSculptor, positioned near the eastern constellation border withFornax. It has an orange hue and is dimly visible to the naked eye with anapparent visual magnitude of 5.25.[2] Based uponparallax measurements, the system is located at a distance of 66 light years from the Sun, and is drifting further away with aradial velocity of +14 km/s.[1]
The visible component is an aginggiant/bright giant star with astellar classification of K1II/III.[4] It is ared clump giant, which indicates it is on thehorizontal branch and is generating energy throughcorehelium fusion.[3] The star has 1.5[3] times themass of the Sun and 9.3[1] times theSun's radius. It is radiating 41[1] times theluminosity of the Sun from its swollenphotosphere at aneffective temperature of 4,800 K.[1]
The designation Pi Sculptoris hasn’t always been allocated to this star. It was given this designation by Lacaille when he created Sculptor. WhenBode created his own constellationMachina Electrica, he took about half of Sculptor and parts ofFornax, including this star, which he designatedMu Machinae Electricae. Bode used Pi Sculptoris forHD 2490 (HR 109) instead, which is currently inPhoenix. After Machina Electrica was deemed obsolete by theIAU, the stars were returned to their original constellations.[9]
