TZ Arietis

TZ Arietis
Observation data; Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	02h 00m 12.959s
Declination	+13° 03′ 07.01″
Apparent magnitude (V)	12.298
Characteristics
Spectral type	M4.5 V
U−B color index	+1.37
B−V color index	+1.80
R−I color index	1.39
Variable type	Flare star
Astrometry
Proper motion (μ)	RA: +1092.0 mas/yr; Dec.: –1772.9 mas/yr
Parallax (π)	222 ± 5 mas
Distance	14.7 ± 0.3 ly; (4.5 ± 0.1 pc)
Details
Luminosity (bolometric)	0.00135 L☉
Rotational velocity (v sin i)	3.8 km/s
Other designations
	TZ Ari, 2MASS J02001278+1303112, GCTP 412.02, GJ 83.1, Glicas 003-033, LHS 11.

TZ Arietis is the variable star designation for a red dwarf star in the northern constellation of Aries. With an apparent visual magnitude of 12.298^[2] is too faint to be seen by the naked eye, although it lies relatively close to our Sun at a distance of about 14.7 light-years (4.5 parsecs).^[5] It is a flare star, which means it can suddenly increase in brightness for short periods of time.

References [edit]

^ ^a ^b ^c ^d Zacharias, N. et al. (2003), "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)", CDS/ADC Collection of Electronic Catalogues volume=1289, Bibcode:2003yCat.1289....0Z.
^ ^a ^b Landolt, Arlo U. (July 1992), "UBVRI photometric standard stars in the magnitude range 11.5-16.0 around the celestial equator", Astronomical Journal 104 (1): 340–371, 436–491, Bibcode:1992AJ....104..340L, doi:10.1086/116242.
^ Riaz, Basmah; Gizis, John E.; Harvin, James (August 2006), "Identification of New M Dwarfs in the Solar Neighborhood", The Astronomical Journal 132 (2): 866–872, arXiv:astro-ph/0606617, Bibcode:2006AJ....132..866R, doi:10.1086/505632.
^ ^a ^b Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N.
^ ^a ^b Harrington, R. S.; Dahn, C. C. (April 1980), "Summary of U.S. Naval Observatory parallaxes", Astronomical Journal 85: 454–465, Bibcode:1980AJ.....85..454H, doi:10.1086/112696.
^ ^a ^b McLean, M.; Berger, E.; Reiners, A. (February 2012), "The Radio Activity-Rotation Relation of Ultracool Dwarfs", The Astrophysical Journal 746 (1): 23, arXiv:1108.0415, Bibcode:2012ApJ...746...23M, doi:10.1088/0004-637X/746/1/23.
^ "TZ Ari -- Flare Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-18.

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Observation data Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	02^h 00^m 12.959^s^[1]
Declination	+13° 03′ 07.01″^[1]
Apparent magnitude (V)	12.298^[2]
Characteristics
Spectral type	M4.5 V^[3]
U−B color index	+1.37^[4]
B−V color index	+1.80^[4]
R−I color index	1.39
Variable type	Flare star
Astrometry

Proper motion (μ)	RA: +1092.0^[1] mas/yr Dec.: –1772.9^[1] mas/yr
Parallax (π)	222 ± 5^[5] mas
Distance	14.7 ± 0.3 ly (4.5 ± 0.1 pc)

Details

Luminosity (bolometric)	0.00135^[6] L_☉
Rotational velocity (v sin i)	3.8^[6] km/s

Other designations
TZ Ari, 2MASS J02001278+1303112, GCTP 412.02, GJ 83.1, Glicas 003-033, LHS 11.^[7]