Delta Orionis

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Delta Orionis
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Delta Orionis Aab/B/C Observation data
Epoch J2000
Constellation Orion
Right ascension 05h 32m 00.4s
Declination −00° 17′ 57″
Apparent magnitude (V) 2.23(3.2/3.3) / 6.85 / 14.0
Characteristics
Spectral type O9.5 II / B2 V
U-B color index −1.05
B-V color index −0.22
Variable type Eclipsing binary
Astrometry
Radial velocity (Rv) 16 km/s
Proper motion (μ) RA: 1.67 mas/yr
Dec.: 0.46 mas/yr
Parallax (π) 3.56 ± 0.83 mas
Distance approx. 900 ly
(approx. 280 pc)
Absolute magnitude (MV) −4.99
Other designations
Mintaka, Mintika, 34 Ori, HR 1852/1851, BD −00°983, HD 36486/36485, SAO 132220/132221, FK5 206, HIP 25930.
Database references
SIMBAD data

Delta Orionis (δ Ori) is one of the three stars of the belt of the constellation Orion. It also has the traditional name Mintaka (from منطقة manţaqah, which means "belt" in Arabic).

Mintaka is actually a multiple star with a magnitude 7 star about 52" away from the main component and an even fainter star in between. The main component itself is also double, consisting of a class B giant and a smaller but hotter class O. The stars orbit each other every 5.73 days. These two stars are both about 70,000 times as luminous as the Sun with a mass of some 20 solar masses.

In 1904, Johannes Hartmann discovered that interstellar space contains a thin gas, by using Mintaka as a background source (see interstellar medium).

[edit] See also

* Delta Orionis in fiction

[edit] External links

* Descriptions
* Bright Star Catalogue
* Mintaka

Retrieved from "http://en.wikipedia.org/wiki/Delta_Orionis"

Categories: Bayer objects | Binary stars | Eclipsing binaries | Blue bright giants | Blue-white dwarfs | Orion constellation
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