TZ Arietis
TZ Arietis is a wee reid droich o a starn in the constellation Aries. This starn is faur ower dwaum tae be seen wi the nakit ee, althou it lies relatively close tae oor Sun at a lenth o aboot 14.5 licht year. It is a bleizin starn, whilk means it's brichtness can rax awfu suddent for a whilie.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Richt ascension | 02h 00m 12.959s[1] |
| Declination | +13° 03′ 07.01″[1] |
| Apparent magnitude (V) | 12.298[2] |
| Chairactereestics | |
| Spectral type | M4.5 V[3] |
| U−B colour index | +1.37[4] |
| B−V colour index | +1.80[4] |
| R−I colour index | 1.39 |
| Variable teep | 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 |
| Ither designations | |
References
eedit- ↑ 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, 1289, Bibcode:2003yCat.1289....0Z.
- ↑ Landolt, Arlo U. (Julie 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.
- ↑ Harrington, R. S.; Dahn, C. C. (Apryle 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. (Februar 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 18 August 2012.