It primary component is a blue giant B9. It consists of a blue giant and a blue subgiant that are around twice as massive as our sun, 30 times more luminous, and orbit each other once every 21 years at an average distance of It is an orange giant that is about 62 times bigger than the Sun , 5 times more massive, and 1, brighter. It is 11 times bigger than the Sun, 3 times more massive, and 52 times more luminous. In fact, this variable star is one of the brightest yet discovered in the Milky Way , and is generally believed to be up to times more massive than the Sun, and between 4 and 10 million times more luminous, meaning it produces about as much energy in 20 seconds as the Sun does in a full year.
Being located in such a dense part of the night sky means it is packed with many interesting deep-sky objects DSOs worth observing through a telescope. The 36th brightest star in the sky, Epsilon Sagittarii is light-years distant and times brighter than the sun, though slightly smaller.
According to astronomer David Darling, Epsilon Sagittarii has traditionally been classified as a cool B-star, but more recent observations have classified it as a hot-end class A as a bright giant. Forming the top of the Teapot, Lambda Sagittarii Kaus Borealis, or northern bow is 77 light-years from the sun and is the fifth-brightest star though Lambda is the eleventh letter in the Greek alphabet. An orange giant, the star is 11 times brighter than the sun and lies about 77 light-years away.
Delta Sagittarii Kaus Media, or middlebow is a double star about light-years from the sun. The giant star has three dim companions that may or may not be connected to the primary. In , a working group organized by the International Astronomical Union approved the name Kaus Media for the star. At the tip of the arrowhead lies a pair of double stars that share the Gamma Sagittarii designation. M20, the Trifid Nebula, is famous for its dark dust lane that divides it into three distinct areas.
M17, also known as the Omega Nebula or Swan Nebula, is an emission nebula located over 5, light years from Earth.
M22, the Sagittarius Cluster, is a globular cluster that contains over 80, stars. It is also one of only four globular clusters known to contain a planetary nebula. This constellation also contains a large number of non-Messier objects including globular clusters, open clusters, and nebulas. Sagittarius is one of the richest constellations to explore for amateur astronomers because there are so many fascinating objects that can be seen with just a pair of binoculars.
A small telescope will bring even more wonders into view. To search this site, type your search word s in the box below and click the search button:. All rights reserved. Bright Nebulae in the constellation Sagittarius. Saggitarius is one of the more interesting constellations in the night sky due to the many bright Messier objects within it.
In the northern hemisphere, Sagittarius signifies the return of warmer weather and many fascinating telescopic objects. I highly recommend spending time in this area of the night sky with your binoculars or Dobsonian telescope and eyepiece here is the telescope I recommend. The photo above was captured using a DSLR camera on a stationary tripod from a dark sky site. To learn how to take pictures like this with your camera, see my Milky Way photography tips.
Sagittarius is the 15th biggest constellation in the sky with a surface area of square degrees. If you want to get more technical, the constellation is placed in the fourth quadrant of the southern hemisphere i. The constellation is quite easy to locate given its one of the largest in the southern sky. As a whole, this constellation is often viewed as having an approximate appearance of a stick figurine drawing an arrow from a bow.
Sagittarius Star Map. IUA and Sky and Telescope. The arrow is pointed at the heart of Scorpius. The following star map shared by Astro Bob is a great representation of the Sagittarius constellation from mid-northern latitudes.
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