Merope (star)

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Merope, 23 Tau
Merope is close to Alcyone (map bottom).
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 03h 46m 19.5739s[1]
Declination 23° 56′ 54.090″[1]
Apparent magnitude (V) 4.113[1]
Spectral type B6IVe[1]
U−B color index -0.41
B−V color index -0.06[2]
Variable type Beta Cephei
Radial velocity (Rv) 6.2[1] km/s
Proper motion (μ) RA: 21.17[1] mas/yr
Dec.: -42.67[1] mas/yr
Parallax (π) 9.08 ± 1.04[3] mas
Distance approx. 360 ly
(approx. 110 pc)
Absolute magnitude (MV) −1.07
Radius 5.1[4] R
Surface gravity (log g) 4.0[4] cgs
Temperature 13,360 ± 340[4] K
Other designations
Merope, 23 Tau, HR 1156, BD 23° 522, HD 23480, HIP 17608, SAO 76172, GC 4512, CCDM J03463+2357A
Database references

Merope (23 Tauri) is a star in the constellation Taurus and a member of the Pleiades star cluster. It is approximately 360 light years from Earth.

Merope is a blue-white B-type subgiant with a mean apparent magnitude of +4.14. Richard Hinckley Allen described the star as lucid white and violet.[5] It has a luminosity of 630 times that of the Sun and a surface temperature of 14,000 kelvins. Merope's mass is roughly 4.5 solar masses and has a radius more than 4 times as great as the Sun's. It is classified as a Beta Cephei type variable star and its brightness varies by 0.01 magnitudes.

Surrounding Merope is the Merope Nebula. Part of the nebula that the Pleiades Cluster is currently passing through, it appears brightest around Merope and is listed in the Index Catalogue as number IC 349.

See also[edit]


  1. ^ a b c d e f g SIMBAD query result: MEROPE -- Be Star, Centre de Données astronomiques de Strasbourg, retrieved 2010-06-12 
  2. ^ Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), "Four-color, Hbeta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220 
  3. ^ Perryman, M. A. C.; et al. (1997), "The HIPPARCOS Catalogue", Astronomy and Astrophysics Supplement Series, 323 34: 1–49, L49–L52, Bibcode:1997A&A...323L..49P 
  4. ^ a b c Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601 
  5. ^ Merope, Star Names and their Meanings, Richard Hinckley Allen, Dover Publications, 1963, p. 407.

External links[edit]

Coordinates: Sky map 03h 46m 19.5739s, +23° 56′ 54.090″