{"id":60483,"date":"2024-06-26T06:53:43","date_gmt":"2024-06-26T06:53:43","guid":{"rendered":"http:\/\/0f4365f5-a121-4bc7-829e-9cea60d398bd"},"modified":"2024-06-26T07:41:05","modified_gmt":"2024-06-26T07:41:05","slug":"how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun\/","title":{"rendered":"How to spot star Seginus, the billion-year-old star that’s five times as large as the Sun"},"content":{"rendered":"

<\/p>

By Pete Lawrence\n <\/p>

Published: Wednesday, 26 June 2024 at 06:53 AM<\/p>

\n\n

Seginus (Gamma (\u03b3) Bo\u00f6tis) is one of the stars in the main kite-shaped asterism that defines the core of the constellation Bo\u00f6tes<\/a> the Herdsman<\/p>

More specifically, it\u2019s the star that marks the westernmost shoulder of the kite, nearest to the Plough<\/a>.<\/p>

Shining at mag. +3.0, Seginus has a 12th-magnitude companion 33.4 arcseconds away.<\/p>

Appearances are deceptive though, as it\u2019s simply a line-of-sight pairing.<\/p>

The constellation Bo\u00f6tes. Click to expand.<\/figcaption><\/figure>

Seginus, the bright star, is around 85 lightyears away while the \u2018companion\u2019 is estimated at 1,996 lightyears<\/a> \u2013 quite a difference.<\/p>

Having said this, Seginus isn\u2019t alone, having a true companion just 0.07 arcseconds away.<\/p>

This translates to 1.8 AU or a bit further than the distance of Mars from the Sun. Little is known about it.\u00a0<\/p>

The name Seginus is a corruption of the original Greek name, which meant Bo\u00f6tes.<\/p>

It\u2019s a giant star of spectral classification<\/a> A7 IV+(n) or A7 III.<\/p>

\u2018IV\u2019 indicates a subgiant, III a normal giant.<\/p>

\"Star
Star Seginus, located in the constellation Bo\u00f6tes, from Second Digitized Sky Survey (DSS2).<\/figcaption><\/figure>

The \u2018+(n)\u2019 designation indicates that it has broad absorption lines in its spectrum, a result of Seginus\u2019s rapid 139km\/s spin.\u00a0<\/p>

Despite its giant status, compared to most stars we discuss in this section, Seginus\u2019s size and luminosity are rather modest, being around 5.2 times larger and 33.4 times more luminous than our Sun.<\/p>

It\u2019s estimated to be around one billion years old.\u00a0<\/p>

Seginus is a Delta (\u03b4) Scuti-type variable, varying in brightness between mag. +3.02 and +3.07 over a period of 6.97 hours.\u00a0<\/p> <\/body><\/html>\n

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By Pete Lawrence Published: Wednesday, 26 June 2024 at 06:53 AM Seginus (Gamma (\u03b3) Bo\u00f6tis) is one of the stars in the main kite-shaped asterism that defines the core of the constellation Bo\u00f6tes the Herdsman More specifically, it\u2019s the star that marks the westernmost shoulder of the kite, nearest to the Plough. Shining at mag. […]<\/p>\n","protected":false},"author":24,"featured_media":60484,"template":"","categories":[1],"acf":{"readingTimeMinutes":"2"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun.jpg",1200,1200,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun-300x300.jpg",300,300,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun-768x768.jpg",768,768,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun-1024x1024.jpg",800,800,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun.jpg",1200,1200,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/06\/how-to-spot-star-seginus-the-billion-year-old-star-thats-five-times-as-large-as-the-sun.jpg",1200,1200,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"By Pete Lawrence Published: Wednesday, 26 June 2024 at 06:53 AM Seginus (Gamma (\u03b3) Bo\u00f6tis) is one of the stars in the main kite-shaped asterism that defines the core of the constellation Bo\u00f6tes the Herdsman More specifically, it\u2019s the star that marks the westernmost shoulder of the kite, nearest to the Plough. Shining at mag.…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed\/60483"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/60484"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=60483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=60483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}