YZ Ceti

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YZ Ceti
YZ Ceti.png
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
Distance 12.2 ± 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.

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.[citation needed]

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[edit]

YZ Ceti distance estimates

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

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

See also[edit]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "HIP 5643". Hipparcos, the New Reduction. Retrieved 2010-08-22. 
  2. ^ a b 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 Edition. 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. ^ van Leeuwen F. (2007). "HIP 5643". Validation of the new Hipparcos reduction. Retrieved 2014-10-20. 
  8. ^ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-20. 

Notes[edit]

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

External links[edit]