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T Microscopii

A visual band light curve of T Microscopii, plotted from ASAS data
Observation data Epoch J2000      Equinox J2000
Constellation	Microscopium
Right ascension	20 27 55.18840
Declination	−28° 15′ 39.8035″
Apparent magnitude (V)	6.74 - 8.11
Characteristics
Spectral type	M6-M8IIIe
Variable type	SRb
Astrometry
Proper motion (μ)	RA: −4.682±0.594 mas/yr Dec.: 12.562±0.433 mas/yr
Parallax (π)	5.1811 ± 0.3864 mas
Distance	630 ± 50 ly (190 ± 10 pc)
Details
Radius	382 R☉
Luminosity	7,509 L☉
Surface gravity (log g)	−0.427 cgs
Temperature	2,750 K
Other designations
T Microscopii, HIP 100935, HD 194676, SAO 189308, CD−28°16682
Database references
SIMBAD	data

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. 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.

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. It was listed with its variable star designation, T Microscopii, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.

References

1. "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
2. ^ van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
3. ^ Otero, Sebastian Alberto (20 June 2011). "T Microscopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 March 2015.
4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
5. ^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.
6. Pickering, E. C.; Fleming, W. P. (April 1896). "Harvard College Observatory, circular no. 6. New variable stars". Astrophysical Journal. 3: 296–302. Bibcode:1896ApJ.....3..296P. doi:10.1086/140219. Retrieved 19 December 2024.
7. Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 18 December 2024.

v t e Constellation of Microscopium
List of stars in Microscopium Microscopium in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ θ ι ν Flamsteed 2 PsA 3 PsA Variable R S T U AT AU AV AX BO DD HR 7817 7893 7909 7933 7971 7987 8046 8100 8104 8108 8200 8202 HD 202628 Other PSR J2124−3358 WASP-7
Exoplanets WASP-7b
Galaxies	NGC 6925 7012 7057 7060 Other ESO 286-19
Category

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• Microscopium
• Objects with variable star designations
• Semiregular variable stars
• M-type giants
• Hipparcos objects
• Henry Draper Catalogue objects
• Durchmusterung objects
• Emission-line stars
• Variable star stubs