မီတက

﻿

မီတက သည် ကြယ်တစ်စင်းဖြစ်ပြီး အလင်းနှစ် ၁၂၀၀ ကွာဝေးကာ အိုရိုင်ယွန် ကြယ်စုတန်းတွင် တည်ရှိသည်။ မီတက ဟူသောနာမည်သည် အာရပ်ဘာသာစကား منطقة manṭaqa မှ ဖြစ်ပြီး ခါးပတ်ဟု အဓိပ္ပာယ်ရသည်။ ယင်းသည်  အိုရိုင်ယွန် ခါးပတ်မှ ကြယ်သုံးစင်းထဲတွင် တစ်ခုအပါဝင်ဖြစ်ကာ ကမ္ဘာမြောက်ဘက်ခြမ်းမှဆိုလျင် လေ့လာသူတစ်ဦးအနေဖြင့် ညာဘက်အစွန်းဆုံး ကြယ်တစ်စင်းဖြစ်သည်။

 လေ့လာမှု သမိုင်းကြောင်း 

Mintaka is the westernmost of the three stars of Orion's belt.  It is easily visible to the naked eye, one of the brightest stars in the sky, and has been known since antiquity.

Radial velocity measurements taken by Henri-Alexandre Deslandres at Paris Observatory showed that Mintaka had a variable radial velocity and therefore was a spectroscopic binary. His preliminary orbital period estimate of 1.92 days was shown to be incorrect in 1904 when Johannes Franz Hartmann using photographic plates taken at Potsdam Observatory showed that the orbital period was 5.7 days. Hartmann also noticed that the calcium K line at 393.4 nanometres in the stellar spectrum did not share in the periodic displacements of the lines due to orbital motion of the star and theorized that there was a cloud in the line of sight to Mintaka that contained calcium. This was the first detection of the interstellar medium.

စနစ်
Mintaka is a multiple star system with a magnitude 7 star about 52 arcseconds away from the main component and an even fainter star in between. The main component itself is triple: a class O9.5 bright giant and a class B main sequence star orbit every 5.73 days and exhibit shallow eclipses when the star dims about 0.2 magnitudes; and a B-class sub-giant is resolved 0.26" away.  At the primary eclipse, the apparent magnitude (of the whole system) drops from 2.23 to 2.35, while it only drops to 2.19 at the secondary eclipse.

The seventh magnitude companion, HD 36485, is an unusual B-type main sequence star and itself a spectroscopic binary with a faint A-type companion in a 30-day orbit.

The 14th magnitude star is thought to be at the same distance, but it isn't clear whether it is physically bound to the primary star and little is known about it.

Mintaka is surrounded by a cluster of faint stars, possibly part of the cluster surrounding σ Ori.

The bright central star of the system is δ Ori A.  Its components are generally referred to by researchers as Aa1, Aa2, and Ab, with HD 36485 referred to as Mintaka (or δ Ori) C, and the closer fourteenth magnitude companion as δ Ori B.  Confusingly, some catalogues list δ Ori Ab as component B or component D, and Simbad names δ Ori Ab as Delta Orionis B.

အကွာအဝေး
The distance derived from the Hipparcos satellite parallax is 212 ± 30 pc, while spectroscopic distances, comparisons to similar stars, and cluster membership all suggest a value more than double that.  This type of unreconcilable discrepancy is not unique to Mintaka and the reasons for it have yet to be clarified.

အိုရိုင်ယွန် ခါးပတ်

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.  The name Mintaka itself is derived from an Arabic term for "belt": منطقة or manṭaqa.

The belt was also the Three Stars mansion (), 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.Schön, Ebbe. (2004). Asa-Tors hammare, Gudar och jättar i tro och tradition. Fält & Hässler, Värnamo. p. 228. 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.

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.

In Spain and Portugal, this asterism is known as Las Tres Marías or As Três Marias, which stand for The Three Marys in Spanish and Portuguese respectively.

In Christian astromythology, Mintaka is also regarded as the third of the three Magi on their way to Bethlehem (Sirius): Caspar, Melchior, Balthasar.

ကိုးကား

ပြင်ပလင့်
 Image of Mintaka from Astronomy Picture of the Day
 http://www.constellationsofwords.com/stars/Mintaka.html
 Mintaka page at Astrostudio 
 Mintaka with HD 36485 visible at 12 noon and star C at 4 o'clock

ကဏ္ဍ:ကြယ်များ
Category:အိုရိုင်ယွန် (ကြယ်စုတန်း)