{"id":31952,"date":"2022-05-24T10:19:54","date_gmt":"2022-05-24T10:19:54","guid":{"rendered":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/?post_type=purple_issue&p=31952"},"modified":"2022-05-24T10:19:54","modified_gmt":"2022-05-24T10:19:54","slug":"star-of-the-month-9","status":"publish","type":"post","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/2022\/05\/24\/star-of-the-month-9\/","title":{"rendered":"Star of the month"},"content":{"rendered":"\n

Kornephoros, the \u2018club bearer\u2019 in Hercules<\/p>\n\n

\"\"
The luminous yellow giant star Kornephoros is located 139 million lightyears away<\/figcaption><\/figure><\/div>\n\n

Hercules, the Hero is a faint and sprawling constellation. It lacks any bright stars, but is saved by a faint asterism known as the Keystone. It\u2019s remarkable how identifiable this shape is, considering its brightest star is mag. +2.8 Zeta (\u03b6) Herculis. Heading south and a bit west from Zeta Herculis brings you to Kornephoros (Beta (\u03b2) Herculis), which shares its mag. +2.8 brightness with Rasalgethi (Alpha (\u03b1)<\/span> Herculis), 13\u02da to Kornephoros\u2019s east-southeast.<\/p>\n\n

Kornephoros means \u2018club bearer\u2019, and it was previously named Rutilicus, a corruption of the Greek word for \u2018armpit\u2019. It\u2019s a spectroscopic binary system with a period of 410 days. The primary is 2.9 times more massive than our own Sun and has a diameter 17 times larger. Its spectral type is G7 IIIa, a yellow giant star in the throes of expanding as it moves off the main-sequence of stellar evolution. The III indicates that Kornephoros is a giant star with the letter \u2018a\u2019 indicating it\u2019s a bit brighter than a typical giant.<\/span><\/p>\n\n

Not much is known about the secondary except that it\u2019s 0.9 times as massive as the Sun. The system is located 139 lightyears away and it was resolved by an Earth-based observatory using the \u2018speckle interferometry\u2019 technique. This involved the use of the Hale Telescope, while follow-up observations using the Hipparcos satellite in 2005 allowed more detail to be determined in respect of the orbit. This is known to be elliptical with an eccentricity of 0.55. Eccentricity is a measure of the ellipticity of an orbit, 0 being circular and 1 being parabolic and open.<\/span> The orbit is also inclined by 53.8\u02da to our line of sight.<\/p>\n\n

PETE LAWRENCE<\/p>\n","protected":false},"excerpt":{"rendered":"

Kornephoros, the \u2018club bearer\u2019 in Hercules<\/p>\n","protected":false},"author":24,"featured_media":31951,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ub_ctt_via":"","purple_page_number":"53","purple_custom_meta_purple_page_number":"53","purple_seq_number":"2","purple_custom_meta_purple_seq_number":"2","purple_source_article":"article_53-2.xml","purple_custom_meta_purple_source_article":"article_53-2.xml","purple_source_issue":"June-2022","purple_custom_meta_purple_source_issue":"June-2022","purple_external_id":"June-2022-53-2","purple_custom_meta_purple_external_id":"June-2022-53-2","purple_issue_code":"|0000086553||","purple_custom_meta_purple_issue_code":"|0000086553||","purple_android_product":"com.im.skyatnight.205","purple_custom_meta_purple_android_product":"com.im.skyatnight.205","purple_ios_product":"com.im.skyatnight.205","purple_custom_meta_purple_ios_product":"com.im.skyatnight.205","purple_web_product":"","purple_custom_meta_purple_web_product":"","purple_publication_id":"075fab74-0a21-4201-866a-899d6c41c40c","purple_migrated":"","kt_blocks_editor_width":""},"categories":[22],"tags":[14],"featured_image_src":"https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991.jpg","author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"acf":{"readingTimeMinutes":"2","apple_news_title":""},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991.jpg",1037,707,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991-300x205.jpg",300,205,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991-768x524.jpg",768,524,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991-1024x698.jpg",800,545,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991.jpg",1037,707,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/05\/f5e544ca-c87a-4b45-a771-df4ae27ab991.jpg",1037,707,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":"Kornephoros, the \u2018club bearer\u2019 in Hercules","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/31952"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/comments?post=31952"}],"version-history":[{"count":3,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/31952\/revisions"}],"predecessor-version":[{"id":32521,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/31952\/revisions\/32521"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/31951"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=31952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=31952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/tags?post=31952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}