Back مو² کژدم Persian Mu2 Scorpii French Mu2 Scorpii Italian Mi2 Scorpii Polish Mu2 Scorpii Portuguese Мю² Скорпиона Russian My2 Scorpii Swedish 尾宿增二 Chinese
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 52m 20.14532s[1] |
| Declination | −38° 01′ 03.1258″[1] |
| Apparent magnitude (V) | +3.56[2] |
| Characteristics | |
| Spectral type | B2 IV[3] |
| U−B color index | −0.878[2] |
| B−V color index | −0.219[2] |
| Astrometry | |
| Radial velocity (Rv) | +1.4[4] km/s |
| Proper motion (μ) | RA: −11.09[1] mas/yr Dec.: −23.32[1] mas/yr |
| Parallax (π) | 6.88±0.12 mas[1] |
| Distance | 474 ± 8 ly (145 ± 3 pc) |
| Absolute magnitude (MV) | −2.25[5] |
| Details[6] | |
| Mass | 9.1±0.3 M☉ |
| Radius | 5.6±0.2 R☉ |
| Luminosity | 2,385[7] L☉ |
| Surface gravity (log g) | 3.8±0.2 cgs |
| Temperature | 21,700±900 K |
| Rotational velocity (v sin i) | 58[8] km/s |
| Age | 20±4 Myr |
| Other designations | |
| Pipirima, μ2 Scorpii, CD−37° 11037, HD 151985, HIP 82545, HR 6252, SAO 208116.[9] | |
| Database references | |
| SIMBAD | data |
Mu2 Scorpii (μ2 Scorpii, abbreviated Mu2 Sco, μ2 Sco), also named Pipirima /pɪˈpɪrɪmə/,[10] is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56,[2] which is bright enough to be seen with the naked eye. Its distance from the Sun is about 474 light-years, as determined by parallax measurements.[1] It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[11] A super-Jupiter or brown dwarf is known to orbit it, and another is suspected. [6]
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