97 Tauri
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Taurus[1] |
| Right ascension | 04h 51m 22.46353s[2] |
| Declination | +18° 50′ 23.4859″[2] |
| Apparent magnitude (V) | 5.09 to 5.13[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A9V[1] or A7IV-V[4] |
| B−V color index | 0.214[1] |
| Variable type | δ Sct[3] |
| Astrometry | |
| Radial velocity (Rv) | +39.1±1.2[5] km/s |
| Proper motion (μ) | RA: +82.319 mas/yr[2] Dec.: −35.743 mas/yr[2] |
| Parallax (π) | 26.1221±0.7454 mas[2] |
| Distance | 125 ± 4 ly (38 ± 1 pc) |
| Absolute magnitude (MV) | 1.53[1] |
| Details | |
| Mass | 1.7[2] M☉ |
| Radius | 2.6[2] R☉ |
| Luminosity | 10.7[2] L☉ |
| Surface gravity (log g) | 3.8[2] cgs |
| Temperature | 7543[2] K |
| Metallicity [Fe/H] | −0.63[2] dex |
| Rotational velocity (v sin i) | 180[4] km/s |
| Age | 1.02[2] Gyr |
| Other designations | |
| Lembu, i Tau, 97 Tau, V480 Tau, BD+18 743, HD 30780, HIP 22565, HR 1547, SAO 94164[5] | |
| Database references | |
| SIMBAD | data |
97 Tauri, also named Lembu, is a star about 125 light-years (38 parsecs) away in the constellation Taurus. With an apparent magnitude of about 5.1, it is faintly visible to the naked eye under good viewing conditions. It is a member of the Hyades star cluster.[6] Because it is close to the ecliptic, this star can be occulted by the Moon.[7]
The stellar classification of 97 Tauri is reported by different sources as A9V[1] or A7IV-V,[4] indicating an A-type main-sequence star or possibly a subgiant. It is a rapidly rotating star, with a projected rotational velocity of 180 km/s.[4] It is classified as a Delta Scuti variable, and has been given the variable star designation V480 Tauri.[3]
97 Tauri forms an optical double with the faint G-type main-sequence star HD 286053, whose parallax indicates that it is an unrelated background object.[8]
Nomenclature
[edit]97 Tauri is the star's Flamsteed designation; it also has the Bayer designation i Tauri. In Chinese astronomy, the asterism Tiāngāo (天高, Celestial High Terrace) consists of the stars 97 Tauri, ι Tauri, 107 Tauri, and 109 Tauri.[10]
In Bali (Indonesia), Lěmbu refers to a constellation (lintang) of an ox, corresponding to the Western constellation Taurus, the bull.[11] The IAU Working Group on Star Names adopted the name Lembu for 97 Tauri on 17 May 2026.[12]
See also
[edit]- Tau Tauri, named Gaja from another Balinese constellation in Taurus
References
[edit]- 1 2 3 4 5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 "V480 Tau". General Catalogue of Variable Stars – VizieR. Retrieved 25 May 2026.
- 1 2 3 4 Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars: III. Velocity distributions". Astronomy & Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. ISSN 0004-6361.
- 1 2 "* i Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 May 2026.
- ↑ Núñez, Alejandro; Agüeros, Marcel A.; et al. (May 2022). "The Factory and the Beehive. IV. A Comprehensive Study of the Rotation X-Ray Activity Relation in Praesepe and the Hyades". The Astrophysical Journal. 931 (1): 45. arXiv:2205.06461. Bibcode:2022ApJ...931...45N. doi:10.3847/1538-4357/ac6517. ISSN 0004-637X.
- ↑ Stecklum, Bringfried (July 1987). "Photoelectric observations of lunar occultations". The Astronomical Journal. 94: 201. Bibcode:1987AJ.....94..201S. doi:10.1086/114464.
- ↑ "HD 286053". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 May 2026.
- ↑ Yi, Shitong (April 1981). 中西对照恒星图表 [Atlas Comparing Chinese and Western Star Maps and Catalogues] (in Chinese). 科学出版社.
- ↑ Stellarium, citing Yi Shitong (1981)[9]
- ↑ Azkarrula, Youla; Hoffmann, Susanne M. "Lembu". All Skies Encyclopaedia. IAU Working Group on Star Names. Retrieved 25 May 2026.
- ↑ "IAU Catalog of Star Names". Retrieved 25 May 2026.
