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Delta Orionis
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
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 | |
| 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).[1]
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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).
Mintaka was also seen by astrologers as a portent of good fortune.[1]
The three belt stars were collectively known by many names in many cultures. Arabic terms include Al Nijād 'the Belt', Al Nasak 'the Line', Al Alkāt 'the Golden Grains or Nuts' and, in modern Arabic, Al Mīzān al H•akk 'the Accurate Scale Beam'. In Chinese mythology they were also known as The Weighing Beam.[1] The belt was also the Three Stars mansion (traditional Chinese: 參宿; simplified Chinese: 参宿; pinyin: Shēn Xiù), one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger.
In pre-Christian Scandinavia, the belt was known as Frigg's Distaff (Friggerock) or Freyja's distaff[2]. Similarly Jacob's Staff and Peter's Staff were European biblical derived terms, as were the Three Magi, or the Three Kings. Väinämöinen's Scythe (Kalevala) and Kalevan Sword are terms from Finnish mythology.[1]
The Seri people of northwestern Mexico call the three belt stars Hapj (a name denoting a hunter) which consists of three stars: Hap (mule deer), Haamoja (pronghorn), and Mojet (bighorn sheep). Hap is in the middle and has been shot by the hunter; its blood has dripped onto Tiburón Island.[3]
- ^ a b c d Richard Hinckley Allen, Star-names and their meanings (1936), p. 314.
- ^ Schön, Ebbe. (2004). Asa-Tors hammare, Gudar och jättar i tro och tradition. Fält & Hässler, Värnamo. p. 228.
- ^ Moser, Mary B.; Stephen A. Marlett (2005). Comcáac quih yaza quih hant ihíip hac: Diccionario seri-español-inglés (in Spanish and English). Hermosillo, Sonora and Mexico City: Universidad de Sonora and Plaza y Valdés Editores.