Epoch J2000 Equinox J2000
|Right ascension||03h 49m 09.7s|
|Declination||+24° 03′ 12″|
|Apparent magnitude (V)||3.62|
|Spectral type||B8 III|
|U−B color index||-0.36|
|B−V color index||-0.09|
|Radial velocity (Rv)||+8.5 km/s|
|Proper motion (μ)||RA: 17.77 mas/yr
Dec.: -44.7 mas/yr
|Parallax (π)||8.57 ± 1.03 mas|
|Absolute magnitude (MV)||-2.04|
27 Tauri is the star's Flamsteed designation.
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Atlas for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.
The primary component, Atlas A, is a blue-white B-type giant with an apparent magnitude of +3.62. It is a spectroscopic binary whose components have magnitudes of +4.1 and +5.6. The binary makes one orbit every 1250 days. Atlas A also has a dimmer magnitude +6.8 companion, Atlas B, at a separation of 0.4 arcseconds or at least 52 astronomical units away.
- Stenner, Paul (auth.); Martin, Jack. Slaney, Kathleen L. Sugarman, Jeff. (edit.) The Wiley Handbook of Theoretical and Philosophical Psychology: Methods, Approaches, and New Directions for Social Sciences. John Wiley & Sons, 2015; pg. 311.
- IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
- "IAU Catalog of Star Names". Retrieved 28 July 2016.
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