Beta Crateris, Latinized from β Crateris, is a binary star system in the southern  constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.46. Based upon an annual  parallax shift of 9.59 mas as seen from Earth, it is located around 340 light years from the Sun.
This is an
astrometric binary star system with an  orbital period of 6.0 years and a projected separation of 8.3 AU. The orbit has an estimated semimajor axis of 9.3 AU. The primary, component A, is listed as an  A-type giant star with a stellar classification of A2 III.   However, Houk and Smith-Moore (1988) give a  main sequence classification of A1 V, while Abt and Morrell (1995) list it as a  subgiant star with a class of A2 IV. The spectrum shows enhanced barium, possibly as a result of a previous mass transfer event. 
The companion, component B, is a
white dwarf of class DA with an effective temperature of 36,885 K that has been cooling down for around four million years.  It has an unusually low mass, 43% that of the Sun, suggesting that the white dwarf progenitor may have transferred matter to its companion. Alternative scenarios require either the evolution of a triple star system, or a binary system with highly  eccentric orbit resulting in grazing interactions. The dwarf is a source of  X-ray emission.
Location of β Crateris (circled)
Epoch J2000.0 Equinox J2000.0 ( ICRS)
Right ascension 11 h 11 m 39.48783 s
−22° 49′ 33.0593″
Apparent magnitude (V) 4.46  (4.61 + 13.40)
A2 III + DA1.4 
 Astrometry Radial velocity (R v) +5.6 ±0.5 km/s  Proper motion (μ) RA: + 5.220 ± 0.546  mas/ yr Dec.: −103.457 ± 0.483  mas/ yr Parallax (π) 11.0358 ± 0.2918  mas Distance 296 ± 8 ly (91 ± 2 pc) Absolute magnitude (M V) −0.62 + 8.19  
Details Luminosity 147  L ☉ Surface gravity (log g) 3.5  cgs Temperature 8,830  K Rotational velocity ( v sin i) 49 km/s  β Crt B Mass 0.43  M ☉ Radius 0.027  R ☉ Surface gravity (log g) 7.40  cgs
Temperature 36,885  K Other designations
SIMBAD data Name
This star was one of the set assigned by the 16th century astronomer Al Tizini
to Al Sharāsīf (  ألشراسيف), the Ribs (of Hydra), which included the stars from β Crateris westward through κ Hydrae. 
According to the catalogue of stars in the
Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sharāsīf were the title for two stars : β Crateris as Al Sharasīf II and κ Hydrae as Al Sharasīf I.
Chinese, 翼宿 ( Yì Sù), meaning , refers to an asterism consisting of β Crateris, Wings (asterism) α Crateris, γ Crateris, ζ Crateris, λ Crateris, ν Hydrae, η Crateris, δ Crateris, ι Crateris, κ Crateris, ε Crateris, HD 95808, HD 93833, θ Crateris, HD 102574, HD 100219, HD 99922, HD 100307, HD 96819, χ, HD 102620 and HD 103462. 1 Hydrae Consequently, β Crateris itself is known as  翼宿十六 ( Yì Sù shíliù, English: the Sixteenth Star of Wings.) 
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(in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
(in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日
(in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System External links Kaler, James B. (May 22, 2015), "Beta Crateris", Stars, University of Illinois , retrieved . 2017-03-03
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