T Microscopii
Variable star in the constellation Microscopium
From Wikipedia, the free encyclopedia
T Microscopii is a semiregular variable star in the constellation Microscopium. It ranges from magnitude 6.74 to 8.11 over a period of 352 days.[3] Located around 700 light-years distant, it shines with a bolometric luminosity 7,509 times that of the Sun and has a surface temperature of 2,750 K.[5]
Right ascension20h 27m 55.18840s[2]
Declination−28° 15′ 39.8035″[2]
Apparentmagnitude(V)6.74 - 8.11[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 27m 55.18840s[2] |
| Declination | −28° 15′ 39.8035″[2] |
| Apparent magnitude (V) | 6.74 - 8.11[3] |
| Characteristics | |
| Spectral type | M6-M8IIIe[3] |
| Variable type | SRb[3] |
| Astrometry | |
| Proper motion (μ) | RA: −4.682±0.594[4] mas/yr Dec.: 12.562±0.433[4] mas/yr |
| Parallax (π) | 5.1811±0.3864 mas[4] |
| Distance | 630 ± 50 ly (190 ± 10 pc) |
| Details | |
| Radius | 382[5] R☉ |
| Luminosity | 7,509[5] L☉ |
| Surface gravity (log g) | −0.427[5] cgs |
| Temperature | 2,750[5] K |
| Other designations | |
| T Microscopii, HIP 100935, HD 194676, SAO 189308, CD−28°16682 | |
| Database references | |
| SIMBAD | data |
In 1896 it was announced that Williamina Fleming had discovered that the star is a variable star, based on photographs taken from 1888 through 1895.[6] It was listed with its variable star designation, T Microscopii, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.[7]
