97 Tauri
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 51m 22.46353s |
| Declination | +18° 50′ 23.4859″ |
| Apparent magnitude (V) | 5.09 to 5.13 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A9V or A7IV-V |
| B−V color index | 0.214 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +39.1±1.2 km/s |
| Proper motion (μ) | RA: +82.319 mas/yr Dec.: −35.743 mas/yr |
| Parallax (π) | 26.1221±0.7454 mas |
| Distance | 125 ± 4 ly (38 ± 1 pc) |
| Absolute magnitude (MV) | 1.53 |
| Details | |
| Mass | 1.7 M☉ |
| Radius | 2.6 R☉ |
| Luminosity | 10.7 L☉ |
| Surface gravity (log g) | 3.8 cgs |
| Temperature | 7543 K |
| Metallicity [Fe/H] | −0.63 dex |
| Rotational velocity (v sin i) | 180 km/s |
| Age | 1.02 Gyr |
| Other designations | |
| Lembu, i Tau, 97 Tau, V480 Tau, BD+18 743, HD 30780, HIP 22565, HR 1547, SAO 94164 | |
| 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. Because it is close to the ecliptic, this star can be occulted by the Moon.
The stellar classification of 97 Tauri is reported by different sources as A9V or A7IV-V, 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. It is classified as a Delta Scuti variable, and has been given the variable star designation V480 Tauri.
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.
Nomenclature
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.
In Bali (Indonesia), Lěmbu refers to a constellation (lintang) of an ox, corresponding to the Western constellation Taurus, the bull. The IAU Working Group on Star Names adopted the name Lembu for 97 Tauri on 17 May 2026.
See also
- Tau Tauri, named Gaja from another Balinese constellation in Taurus
References
- 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)
- ↑ 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.
