{"version":"1.0","provider_name":"SPACE OF CHALLENGE ASIA","provider_url":"https:\/\/spacechallenge.asia\/th","author_name":"admin spacechallenge","author_url":"https:\/\/spacechallenge.asia\/th\/author\/admin\/","title":"August\u2019s Night Sky Notes: Seeing Double - SPACE OF CHALLENGE ASIA","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"TGDrBkEmPq\"><a href=\"https:\/\/spacechallenge.asia\/th\/night-sky-notes-seeing-double\/\">August\u2019s Night Sky Notes: Seeing Double<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/spacechallenge.asia\/th\/night-sky-notes-seeing-double\/embed\/#?secret=TGDrBkEmPq\" width=\"600\" height=\"338\" title=\"&#8220;August\u2019s Night Sky Notes: Seeing Double&#8221; &#8212; SPACE OF CHALLENGE ASIA\" data-secret=\"TGDrBkEmPq\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n<\/script>","thumbnail_url":"https:\/\/spacechallenge.asia\/wp-content\/uploads\/2024\/08\/aug24nsn-dblstars.webp","thumbnail_width":1027,"thumbnail_height":1027,"description":"During the summer months, we tend to miss the views of Saturn, Jupiter and other heavenly bodies. But it can be a great time to look for other items, like globular star clusters such as Messier 13, open star clusters such as the Coma Star Cluster (Melotte 111), but also\u00a0double stars! \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 What Are Double Stars? \u00a0 If you have seen any movies or read any books that refer to having two suns in the sky, that would be a\u00a0double star system. These star systems typically come in two types \u2013 binary and optical doubles. Binary stars are two stars that are gravitationally bound and orbit each other, and optical double stars only\u00a0appear\u00a0to be close together when viewed from Earth, but in reality, are extremely far apart from another, and are not affected by each other\u2019s gravity. With a small telescope, in moderately light polluted skies, summer offers great views of these stellar groupings from the Northern Hemisphere: Double Double:\u00a0also known by its technical name, Epsilon Lyrae, this multiple star system appears as one star with naked eye observing. But with a small telescope, it can be split into \u2018two\u2019 stars. A large telescope reveals Epsilon Lyrae\u2019s secret \u2013 what looks like a single star is actually a\u00a0quadruple\u00a0star system! Albireo:\u00a0a gorgeous double star set \u2013 one blue, one yellow \u2013 in the constellation Cygnus. Polaris:\u00a0while technically a multiple star system, our North Star can easily be separated from one star to two with a modest telescope. Mizar and Alcor:\u00a0located in the handle of the Big Dipper, this pair can be seen with the naked eye. This schematic shows the configuration of the sextuple star system TYC 7037-89-1. The inner quadruple is composed of two binaries, A and C, which orbit each other every four years or so. An outer binary, B, orbits the quadruple roughly every 2,000 years. All three pairs are eclipsing binaries. The orbits shown are not to scale. NASA&#8217;s Goddard Space Flight Center Aside from looking incredible in a telescope or binoculars, double stars help astronomers learn about measuring the mass of stars, and about stellar evolution. Some stars orbit each other a little too closely, and\u00a0things can become disastrous, but overall, these celestial bodies make for excellent targets and are simple crowd pleasers. \u00a0 Up next, learn about the Summer Triangle\u2019s hidden treasures on our mid-month article on the\u00a0Night Sky Network\u00a0page."}