.jpg) R145 is the isolated bright star to the left of the image, near R136 (annotated at Commons) Credit: NASA, ESA, F. Paresce (INAF-IASF, Bologna, Italy), R. O'Connell (University of Virginia, Charlottesville), and the Wide Field Camera 3 Science Oversight Committee | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 38m 57.059s[1] |
| Declination | −69° 06′ 05.70″[1] |
| Apparent magnitude (V) | 12.04[2] |
| Characteristics | |
| Spectral type | WN6h + O3.5If*/WN7[3] |
| U−B color index | −0.79[4] |
| B−V color index | −0.01[2] |
| Astrometry | |
| Radial velocity (Rv) | 270 ± 5[3] km/s |
| Distance | 163,000 ly (49,970[5] pc) |
| Absolute magnitude (MV) | −7.21 + −7.43[3] |
| Orbit[3] | |
| Period (P) | 158.760 |
| Semi-major axis (a) | 955 R☉ |
| Eccentricity (e) | 0.788 ± 0.007 |
| Inclination (i) | 39 ± 6° |
| Semi-amplitude (K1) (primary) | 96 ± 3 km/s |
| Semi-amplitude (K2) (secondary) | 95 ± 4 km/s |
| Details[3] | |
| Primary | |
| Mass | 53+40 −20 M☉ |
| Radius | 20+6 −5 R☉ |
| Luminosity | 2,240,000+924,000 −654,000 L☉ |
| Temperature | 50,000 ± 3,000 K |
| Rotational velocity (v sin i) | < 200 km/s |
| Secondary | |
| Mass | 54+40 −20 M☉ |
| Radius | 26+9 −7 R☉ |
| Luminosity | 2,140,000+882,000 −624,000 L☉ |
| Temperature | 43,000 ± 3,000 K |
| Rotational velocity (v sin i) | < 150 km/s |
| Age | 2.2 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
R145 (HD 269928) is a spectroscopic binary star in the Tarantula Nebula in the Large Magellanic Cloud located in the constellation Dorado. Both components are amongst the most luminous known.
- ^ a b Cite error: The named reference
tycho2was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
censuswas invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
shenarwas invoked but never defined (see the help page). - ^ Cite error: The named reference
ubvwas invoked but never defined (see the help page). - ^ Pietrzyński, G; D. Graczyk; W. Gieren; I. B. Thompson; B. Pilecki; A. Udalski; I. Soszyński; et al. (7 March 2013). "An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent". Nature. 495 (7439): 76–79. arXiv:1303.2063. Bibcode:2013Natur.495...76P. doi:10.1038/nature11878. PMID 23467166. S2CID 4417699.