Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Norma |
Right ascension | 16h 01m 22.2226s[1] |
Declination | −54° 08′ 35.6066″[1] |
Apparent magnitude (V) | 7.3 - 8.6[2] |
Characteristics | |
Evolutionary stage | Red supergiant |
Spectral type | M3 Ia[3] |
U−B color index | +0.75[4] |
B−V color index | +2.10[4] |
Variable type | LB[2] |
Astrometry | |
Radial velocity (Rv) | −39.67±0.66[1] km/s |
Proper motion (μ) | RA: −1.1[5] mas/yr Dec.: 13.1[5] mas/yr |
Parallax (π) | 0.5559 ± 0.1021 mas[1] |
Distance | 6,850±650[6] ly (2,100±200[6] pc) |
Absolute magnitude (MV) | −7.5[7] |
Details | |
Mass | 20[6] M☉ |
Radius | 1,261[8] R☉ |
Luminosity | 254,000[8] L☉ |
Surface gravity (log g) | −0.6[6] cgs |
Temperature | 3,443–3,605[9] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 143183 is a red supergiant variable star of spectral type M3Ia in constellation Norma. It is a member of the Norma OB1 association, at a distance of about 2 kiloparsecs. It is one of the most luminous red supergiants with a luminosity over 250,00 times greater than the Sun (L☉), and is as well one of the largest stars with a radius more than a thousand times that of the Sun (R☉).[8] Older studies frequently calculated higher luminosities and radii.[6][11] It has an estimated mass loss rate of 5×10−5 M☉ per year[6] and has been once described as a cool hypergiant.[12] It is surrounded by a dozen early-type stars and a circumstellar nebula which extends 0.12 parsecs (0.39 ly).
HD 143183 is catalogued with the variable star designation V558 Normae as its brightness varies irregularly between apparent magnitudes 7.3 and 8.6.[2]
It is possible that HD 143183 is a spectroscopic binary with an OB+ companion but this is considered doubtful.[6] HD 143183 lies approximately 1' from the 10th-magnitude O-class bright giant CD-53 6363, the second-brightest star in the cluster.
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