YZ Ceti

YZ Ceti

Location of YZ Ceti, click for larger image.
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 01h 12m 30.64s [1]
Declination −16° 59′ 56.3″ [1]
Apparent magnitude (V) 12.10
Characteristics
Spectral type M4.5V
U−B color index 1.35
B−V color index 1.83
Variable type Flare star
Astrometry
Radial velocity (Rv)+28.2 km/s
Proper motion (μ) RA: 1208.53 ± 5.57 [1] mas/yr
Dec.: 640.73 ± 3.71 [1] mas/yr
Parallax (π)267.4 ± 3.0[2] mas
Distance12.2 ± 0.1 ly
(3.74 ± 0.04 pc)
Absolute magnitude (MV)14.25
Other designations
GCTP 248.01, GJ 54.1, Gl 268-135, LHS 138, LTT 670, L 725-32, HIP 5643.
Database references
SIMBADdata

YZ Ceti is a red dwarf star in the constellation Cetus. Although it is relatively close to the Sun at just 12 light years,[1] this star cannot be seen with the naked eye. It is classified as a flare star that undergoes intermittent fluctuations in luminosity. YZ Ceti is only about 8.5% the mass of our Sun, and is normally less than 1/5,000th as luminous.

This star is unusually close to Tau Ceti, a star of spectral class G8. The two are only about 1.6 light years apart,[3] a little more than a third of the distance from the Sun to our nearest neighbor, Proxima Centauri.

Distance

YZ Ceti distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Gliese & Jahreiß (1991) 267.4±3.0 3.74±0.04 12.2±0.14 115.4±1.3 [2]
van Altena et al. (1995) 268.8±3.2 3.72±0.04 12.13+0.15
−0.14		 114.8±1.4 [4]
Perryman et al. (1997) (Hipparcos) 269.05±7.57 3.72+0.11
−0.1		 12.1+0.4
−0.3		 114.7+3.3
−3.1		 [5]
Perryman et al. (1997) (Tycho) (absents) [6]
Riaz et al. (2006) ~ 4 ~ 13 ~ 123.4 [7]
van Leeuwen (2007) 271.01±8.36 3.69+0.12
−0.11		 12±0.4 113.9+3.6
−3.4		 [8]
RECONS TOP100 (2012) 269.08±2.99[note 1] 3.72±0.04 12.12+0.14
−0.13		 114.7±1.3 [9]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "HIP 5643". Hipparcos, the New Reduction. Retrieved 2010-08-22.
  2. ↑ 2.0 2.1 Gliese, W. and Jahreiß, H. (1991). "Gl 54.1". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-10-20.
  3. ↑ Page of Tau Ceti, see the chapter of Closest Neighbors, for YZ Ceti.
  4. ↑ Van Altena W. F., Lee J. T., Hoffleit E. D. (1995). "GCTP 248.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-10-20.
  5. ↑ Perryman et al. (1997). "HIP 5643". The Hipparcos and Tycho Catalogues. Retrieved 2014-10-20.
  6. ↑ Perryman et al. (1997). "HIP 5643". The Hipparcos and Tycho Catalogues. Retrieved 2014-10-20.
  7. ↑ Riaz, Basmah; Gizis, John E.; Harvin, James (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. Table 1.
  8. ↑ van Leeuwen F. (2007). "HIP 5643". Validation of the new Hipparcos reduction. Retrieved 2014-10-20.
  9. ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-20.

Notes

  1. ↑ Weighted parallax based on parallaxes from van Altena et al. (1995) and van Leeuwen (2007).

External links