Maia (star)
Star Maia (20 Tauri) |
|||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Center right in the Pleiades: Maia | |||||||||||||||||||
AladinLite | |||||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|||||||||||||||||||
Constellation | bull | ||||||||||||||||||
Right ascension | 03 h 45 m 49.61 s | ||||||||||||||||||
declination | + 24 ° 22 ′ 3.9 ″ | ||||||||||||||||||
Apparent brightness | 3.87 likes | ||||||||||||||||||
Typing | |||||||||||||||||||
B − V color index | −0.07 | ||||||||||||||||||
U − B color index | −0.40 | ||||||||||||||||||
R − I index | −0.05 | ||||||||||||||||||
Spectral class | B8 III | ||||||||||||||||||
Variable star type | ACV | ||||||||||||||||||
Astrometry | |||||||||||||||||||
Radial velocity | (7.4 ± 0.5) km / s | ||||||||||||||||||
parallax | (8.51 ± 0.28) mas | ||||||||||||||||||
distance | (360 ± 12) ly (110 ± 4) pc |
||||||||||||||||||
Visual absolute brightness M vis | −1.03 mag | ||||||||||||||||||
Proper movement | |||||||||||||||||||
Rec. Share: | (20.95 ± 0.31) mas / a | ||||||||||||||||||
Dec. portion: | (−45.98 ± 0.28) mas / a | ||||||||||||||||||
Physical Properties | |||||||||||||||||||
Dimensions | (4.22 ± 0.18) M ☉ | ||||||||||||||||||
radius | (6.61 ± 0.11) R ☉ | ||||||||||||||||||
Luminosity |
660 L ☉ |
||||||||||||||||||
Effective temperature | 12600 K | ||||||||||||||||||
Metallicity [Fe / H] | 1.10 | ||||||||||||||||||
Rotation time | 8 d | ||||||||||||||||||
Age | 100 mill. A | ||||||||||||||||||
Other names and catalog entries |
|||||||||||||||||||
|
Maia (meaning as "grandmother", "nurse", "The Big") is the proper name of the Plejaden belonging star 20 Tauri in the constellation Taurus .
properties
Maia has an apparent magnitude of +3.87 mag and belongs to the spectral class B8III. It is about 360 light years away from Earth ( Hipparcos database). According to measurements from the Gaia mission , the star is at a distance of 340 ± 30 light years away. That would make him one of the closest stars in the Pleiades.
As a variable star , the star belongs to the Alpha 2 -Canum Venaticorum stars . It also belongs to the special star class of the mercury-manganese stars .
The star is also part of the Maia nebula NGC 1432 , a reflection nebula .
Coverings
Maia, like all stars of the Pleiades, can occasionally be covered by the moon .
The next temporary occultations are expected again from 2024.
mythology
Maia ( ancient Greek Μαῖα, Μαίας or Μαίη ) is one of the seven Pleiades in Greek mythology .
She is the daughter of the titans Atlas and Pleione and through Zeus becomes the mother of Hermes .
Web links
Individual evidence
- ↑ a b c d 20 Tau. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed January 27, 2019 .
- ↑ a b c Bright Star Catalog
- ↑ a b NSV 1279. In: VSX. AAVSO, accessed July 21, 2018 .
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ a b c TR White, BJS Pope, V. Antoci, PI Pápics, C. Aerts, DR Gies, K. Gordon, D. Huber, GH Schaefer, S. Aigrain, S. Albrecht, T. Barclay, G. Barentsen , PG Beck, TR Bedding, M. Fredslund Andersen, F. Grundahl, SB Howell, MJ Ireland, SJ Murphy, MB Nielsen, V. Silva Aguirre, PG Tuthill: Beyond the Kepler / K2 bright limit: Variability in the seven brightest members of the Pleiades . In: Monthly Notices of the Royal Astronomical Society . 471, No. 3, 2017, pp. 2882–2901. arxiv : 1708.07462 . bibcode : 2017MNRAS.471.2882W . doi : 10.1093 / mnras / stx1050 .
- ^ Royer, F .; Grenier, S .; Baylac, M.-O .; Gomez, AE; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere" (PDF). Astronomy and Astrophysics 393 (3): 897-911
- ↑ Messier 45 at SEDS