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There are more opportunities to observe Jupiter interacting with its four major moons in July 2021. The four moons are Europa, Io, Ganymede and Callisto, and are known as the Galilean moons<\/a> because of the fact that they were discovered by Galilleo.<\/p>\n On 9 June<\/strong>, moons Io<\/a> and Europa appear separated by 3 arcseconds \u2013 the apparent size of Uranus<\/a>. Closest separation is at 02:43 BST (01:43 UT).<\/p>\n On 12 June<\/strong>, Callisto\u2019s shadow <\/span>transits Jupiter between 22:48 BST (21:48 UT) and 03:32 BST (02:32 UT). This begins before Jupiter rises and progresses as the gas giant gains altitude.<\/p>\n Ganymede\u2019s shadow transits on 17 and 25 July<\/strong>. The event <\/span>on 17 July<\/strong> occurs between 23:40 BST (22:40 UT) and 02:17 BST (01:17 UT) on 18 July<\/strong>.<\/p>\n Ganymede itself transits on <\/span>18 July<\/strong> from 02:53 BST (01:53 UT). The shadow transit on 25 July <\/strong><\/span>starts at 03:44 BST (02:44 UT).<\/p>\n On 29 July<\/strong>, a telescopic view of Jupiter just after rising will show two moons and a moon shadow in transit. Callisto <\/span>and Io will be in transit along with Io\u2019s shadow.<\/p>\n Io\u2019s shadow exits transit at 23:23 BST (22:23 UT), Io at 23:53 BST (22:53 UT). Callisto leaves Jupiter\u2019s disc at 02:36 BST (01:36 UT) on 30 July<\/strong>.<\/span><\/p>\n Pete Lawrence is an experienced observer and a presenter on The Sky at Night. This guide originally appeared in the July 2021 issue of <\/strong><\/em>BBC Sky at Night Magazine<\/strong>.<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":" There are more opportunities to observe Jupiter interacting with its four major moons in July 2021. The four moons are Europa, Io, Ganymede and Callisto, and are known as the Galilean moons because of the fact that they were discovered by Galilleo. On 9 June, moons Io and Europa appear separated by 3 arcseconds \u2013 […]<\/p>\n","protected":false},"author":24,"featured_media":0,"template":"","categories":[1],"acf":{"readingTimeMinutes":"2"},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":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":"There are more opportunities to observe Jupiter interacting with its four major moons in July 2021. The four moons are Europa, Io, Ganymede and Callisto, and are known as the Galilean moons because of the fact that they were discovered by Galilleo. On 9 June, moons Io and Europa appear separated by 3 arcseconds \u2013…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed\/20259"}],"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:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=20259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=20259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} ![\"View](\"https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/25\/2021\/05\/Jupiter-Galilean-Moons-July-2021-ca6225a.jpg?quality=90&resize=620%2C362\" "\\"View")
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