HV 11417
Candidate Thorne–Żytkow object in the constellation Tucana
From Wikipedia, the free encyclopedia
HV 11417 is a candidate Thorne–Żytkow object in the Small Magellanic Cloud, put forward in a paper by Emma Beasor and collaborators. The paper also claims that another candidate for the Thorne–Żytkow object, HV 2112, was not a Thorne–Żytkow object because it seemingly lacked any distinguishing quality which would indicate that classification.[4] It has since been reported that HV 11417 may be a foreground halo star.[10] As of Gaia's 3rd data release the star has been measured to have a negative parallax, suggesting a distance of more than 103,000 light-years (32,000 pc) at the 3-sigma level, and a proper motion consistent with Small Magellanic Cloud stars in its region of the galaxy.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana[1] |
| Right ascension | 01h 00m 48.17s[2] |
| Declination | −72° 51′ 02.1″[2] |
| Apparent magnitude (V) | 19.83[3] |
| Characteristics | |
| Evolutionary stage | M-type supergiant, Thorne–Żytkow object?[4] |
| Spectral type | M5Ie[5] |
| Astrometry | |
| Proper motion (μ) | RA: +0.593[2] mas/yr Dec.: −1.282[2] mas/yr |
| Distance | ~60,000[6] pc |
| Details | |
| Mass | 18.4[7] M☉ |
| Radius | 800[8][a] R☉ |
| Luminosity | 81,283[8] L☉ |
| Surface gravity (log g) | 0.47[2] cgs |
| Temperature | 3,450[8] K |
| Other designations | |
| HV 11417, PMMR 113, TIC 182293383[9] | |
| Database references | |
| SIMBAD | data |
Notes
- Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:
