Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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Constellation | Scorpius |
Right ascension | 16h 53m 59.7269s[1] |
Declination | −42° 21′ 43.290″[1] |
Apparent magnitude (V) | 4.66 to 4.86[2] |
Characteristics | |
Spectral type | B1Iape[1] |
U−B color index | −0.56[3] |
B−V color index | +0.49[3] |
Variable type | SDOR:[2] |
Astrometry | |
Radial velocity (Rv) | −26.0 ± 0.9[1] km/s |
Proper motion (μ) | RA: −0.48[1] mas/yr Dec.: −2.17[1] mas/yr |
Distance | ~5700[4] ly (~1700 pc) |
Absolute magnitude (MV) | −8.7[5] |
Details | |
Mass | 60[4] M☉ |
Radius | 52[6] R☉ |
Luminosity (bolometric) | 1,700,000[7] L☉ |
Rotational velocity (v sin i) | 57[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Zeta1 Scorpii (Zeta1 Sco, ζ1 Scorpii, ζ1 Sco) is a B-type hypergiant star in the constellation of Scorpius.[1] It has an apparent visual magnitude which varies between 4.66 and 4.86.[2] It is one of the most massive stars in the Galaxy, with an estimated mass of approximately 60 solar masses, and is a member of the Scorpius OB1 association,[4] and the open star cluster NGC 6231, also known as the "northern jewel box" cluster. It is also one of the most luminous stars known in the Galaxy, with an estimated bolometric luminosity of approximately 1.7 million times the Sun's.[7]
Zeta-1 Scorpii forms a naked eye double with Zeta-2 Scorpii, but the stars are merely coincidentally near in the line of sight from Earth. Zeta-2 is a mere 155 light years distant and much less luminous in real terms. Zeta-1 Scorpii can also be distinguished from Zeta-2, due to the latter's orangeish color especially in long-exposure photographs.
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