HD 143183
Star in the constellation Norma
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HD 143183 is a red supergiant variable star of spectral type M3Ia[6] or K2[3] in the 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 250,000 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☉).[4] Older studies frequently calculated higher luminosities, which would correspond to larger radii.[9][14] It has an estimated mass loss rate of 5×10−5 M☉ per year[9] and has been once described as a cool hypergiant.[5] It is surrounded by a dozen early-type stars and a circumstellar nebula which extends 0.12 parsecs (0.39 ly).
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma[1] |
| Right ascension | 16h 01m 22.2226s[2] |
| Declination | −54° 08′ 35.607″[2] |
| Apparent magnitude (V) | 7.3 - 8.6[3] |
| Characteristics | |
| Evolutionary stage | Red supergiant[4] or hypergiant[5] |
| Spectral type | M3 Ia[6] or K2[3] |
| U−B color index | +0.75[7] |
| B−V color index | +2.10[7] |
| Variable type | LB[3] |
| Astrometry | |
| Radial velocity (Rv) | −39.67±0.66[2] km/s |
| Proper motion (μ) | RA: −1.1[8] mas/yr Dec.: +13.1[8] mas/yr |
| Parallax (π) | 0.5559±0.1021 mas[2] |
| Distance | 6,850±650[9] ly (2,100±200[9] pc) |
| Absolute magnitude (MV) | −7.5[10] |
| Details | |
| Mass | 20[9] M☉ |
| Radius | 1,261[4] R☉ |
| Luminosity | 254,000[4] L☉ |
| Surface gravity (log g) | −0.6[9] cgs |
| Temperature | 3,443[11] – 3,605[6] K |
| Other designations | |
| V558 Nor, CD−53 6947, HD 143183, IRAS 15576−5400, 2MASS J16013621−5408356[12] | |
| Database references | |
| SIMBAD | data |
HD 143183 is catalogued with the variable star designation V558 Normae as its brightness varies irregularly between apparent magnitudes 7.3 and 8.6.[3]
It is possible that HD 143183 is a spectroscopic binary with an OB+ companion, but this is considered doubtful.[9] HD 143183 lies approximately 1' from the 10th-magnitude O-class bright giant CD−53 6363, the second-brightest star in the cluster.