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Delta Crucis information


  • Imai
  • Delta Crucis
Location of δ Crucis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crux
Right ascension 12h 15m 08.71673s[1]
Declination −58° 44′ 56.1369″[1]
Apparent magnitude (V) 2.78 - 2.84[2]
Characteristics
Spectral type B2 IV[3]
U−B color index −0.921[4]
B−V color index −0.235[4]
Variable type β Cep[5]
Astrometry
Radial velocity (Rv)+22.2[6] km/s
Proper motion (μ) RA: −35.81[1] mas/yr
Dec.: −10.36[1] mas/yr
Parallax (π)9.45 ± 0.15 mas[1]
Distance345 ± 5 ly
(106 ± 2 pc)
Absolute magnitude (MV)−3.2[7]
Details
Mass8.9±0.1[8] M
Radius8.0[9] R
Luminosity10,000[7] L
Surface gravity (log g)3.88[7] cgs
Temperature22,570±1,840[10] K
Rotational velocity (v sin i)210[11] km/s
Age18.1±3.2[8] Myr
Other designations
Imai, Delta Cru, δ Cru, CD−58 4466, FK5 455, HD 106490, HIP 59747, HR 4656, SAO 239791[12]
Database references
SIMBADdata

Delta Crucis or δ Crucis, also identified as Imai (/ˈm/), is a star in the southern constellation of Crux, and is the faintest of the four bright stars that form the prominent asterism known as the Southern Cross. This star has an apparent magnitude of 2.8, and its proper name was adopted by the International Astronomical Union on 10 August 2018.[13] Imai is a massive, hot and rapidly rotating star that is in the process of evolving into a giant, and is located at a distance of about 345 light-years (106 parsecs) from the Sun.

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Delta Crucis

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Delta Crucis or δ Crucis, also identified as Imai (/ˈiːmaɪ/), is a star in the southern constellation of Crux, and is the faintest of the four bright stars...

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Flag of Brazil

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as found on a celestial globe). Thus Beta Crucis appears to the right of the constellation and Delta Crucis to the left, in mirror image of the way they...

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Acrux

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constellation of Crux. It has the Bayer designation α Crucis, which is Latinised to Alpha Crucis and abbreviated Alpha Cru or α Cru. With a combined visual...

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Crux

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clockwise and in order of lessening magnitude: β Crucis (Mimosa), γ Crucis (Gacrux), and δ Crucis (Imai). ε Crucis (Ginan) also lies within the cross asterism...

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Flag of Australia

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centred in lower hoist. Alpha Crucis – 7-pointed star, straight below centre fly 1⁄6 up from bottom edge. Beta Crucis – 7-pointed star, 1⁄4 of the way...

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Gacrux

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the Southern Cross. It has the Bayer designation Gamma Crucis, which is Latinised from γ Crucis and abbreviated Gamma Cru or γ Cru. With an apparent visual...

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Giraffe

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Crux as two giraffes—Acrux and Mimosa forming a male, and Gacrux and Delta Crucis forming the female. The Egyptians were among the earliest people to keep...

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NGC 3532

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ever observed by the Hubble Space Telescope. A line from Beta Crucis through Delta Crucis passes somewhat to the north of NGC 3532. The cluster lies between...

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List of brightest natural objects in the sky

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Eridani Binary star system 3.56 Delta Pavonis Star 3.56 Delta Crateris Star 3.56 Mu2 Scorpii Star 3.57 Epsilon Crucis Star 3.57 Phi Eridani Star 3.57...

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1901 Federal Flag Design Competition

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lower Hoist. Alpha Crucis and Delta Crucis were of different sizes than they are today—with Alpha being larger than at present and Delta being smaller than...

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Liber Secretorum Fidelium Crucis

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The Liber Secretorum Fidelium Crucis (literally 'Book of the Secrets of the Faithful of the Cross') is a Latin work by Marino Sanuto the Elder. It is one...

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R Crucis

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R Crucis is a variable star in the southern constellation of Crux. It has a yellow-white hue and is often too faint to see with the naked eye, having an...

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Classical Cepheid variable

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in the fundamental mode. Confirmed first overtone pulsators include BG Crucis and BP Circini. Chief among the uncertainties tied to the Cepheid distance...

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Australian red ensign

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and five points respectively, and with Alpha Crucis being larger than Beta and Gamma as well as with Delta being smaller than Beta and Gamma, was standardised...

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Chamaeleon

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about 15 degrees south of Acrux, along the axis formed by Acrux and Gamma Crucis. Alpha Chamaeleontis is a white-hued star of magnitude 4.1, 63 light-years...

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List of general fraternities

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Royal Shepherds Sanctuary Benefit Society Ancient Mystical Order Rosae Crucis Ancient Order of Hibernians Beta Sigma Phi, ΒΣΦ, 1931, non-collegiate sorority...

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Am star

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2.96 α Volantis 4.00 Acubens A α Cancri A 4.26 Kurhah ξ Cephei 4.29 θ1 Crucis 4.30 π Virginis 4.64 μ Aurigae 4.88 2 Ursae Majoris 5.46 τ3 Gruis 5.72 WW...

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Betelgeuse

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than Capella. At its faintest, Betelgeuse can fall behind Deneb and Beta Crucis, themselves both slightly variable, to be the twentieth-brightest star....

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List of Australian flags

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same outer diameter as today, Alpha was 1/6 and Delta 1/10 of the fly width. In 1903 Alpha, Beta and Delta were altered to the same design as the Gamma Star...

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List of supernova candidates

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Miller, Nathan A. (June 2008). "Chandra spectroscopy of the hot star beta Crucis and the discovery of a pre-main-sequence companion". Monthly Notices of...

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Galata Tower

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Tower Galata Kulesi Galata Tower (February 2020) Former names Turris Sancte Crucis (Holy Cross Tower) General information Type Touristic building museum exhibition...

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List of compositions by Ennio Morricone

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orchestra) dedicated to his friend trumpet player Mauro Maur 1991 Una via crucis ('Stations of The Cross' in various vocal and instrumental combinations...

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Beta Cephei variable

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Among their number are some of the brightest stars in the sky, such as Beta Crucis and Beta Centauri; Spica is also classified as a Beta Cephei variable but...

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