WOH G17
WOH G17 is a possible red supergiant (RSG) located in the large magellanic cloud (LMC) in the constellation of Mensa. As a red supergiant, it would be one of the largest known stars, with a luminosity of 933,000 L☉ and temperature of 3,300 K implying a radius of about 2,955 R☉ (2.06 × 109 km; 13.8 au).[1] This would correspond to a volume 25.8 billion times bigger than the Sun. However this estimate might be inaccurate due to its unusual huge size. Placed at the center of the Solar system its photosphere would engulf the orbit of Saturn and reach to about 3/4 the distance to Uranus orbit.
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Mensa (LMC) |
| Right ascension | 04h 39m 23.67s |
| Declination | −73° 11′ 02.68″ |
| Characteristics | |
| Spectral type | M |
| Apparent magnitude (K) | 5.52 |
| Apparent magnitude (G) | 11.15 |
| Apparent magnitude (H) | 5.59 |
| Apparent magnitude (J) | 6.92 |
| Astrometry | |
| Radial velocity (Rv) | 101.213 km/s |
| Proper motion (μ) | RA: 2.159 mas/yr Dec.: 7.138 mas/yr |
| Details | |
| Radius | 2,955?[1] R☉ |
| Luminosity | 933,000?[1] L☉ |
| Surface gravity (log g) | +0.5?[1] cgs |
| Temperature | 3,300?[1] K |
| Other designations | |
WOH G17, IRAS 04403-7316, 2MASS J04392369-7311028, LMC 1150 | |
| Database references | |
| SIMBAD | data |
However, the star is considered to be a foreground object; much closer than the LMC and possibly in the Milky Way, and therefore is potentially much smaller and less luminous. It's size is also highly dubious because it's luminosity exceeds the standard limit for certain stellar parameters, the Eddington Limit.[1]
See also
References
- Groenewegen, Martin A. T.; Sloan, Greg C. (2018). "Luminosities and mass-loss rates of Local Group AGB stars and Red Supergiants". Astronomy & Astrophysics. 609: A114. arXiv:1711.07803. Bibcode:2018A&A...609A.114G. doi:10.1051/0004-6361/201731089. ISSN 0004-6361.