{"id":207,"date":"2005-10-22T20:00:00","date_gmt":"2005-10-22T20:00:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2005\/10\/22\/m18\/"},"modified":"2021-11-27T23:21:32","modified_gmt":"2021-11-27T23:21:32","slug":"m18","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/22\/m18\/","title":{"rendered":"Messier 18"},"content":{"rendered":"

<\/a>
\nClick image for larger version.<\/i><\/p>\n

The above sketch is an update to the original to clean it up, scale down fainter stars, and update formatting. The original is shown below.<\/p>\n

\n

<\/p>\n

Observation Notes:<\/b><\/p>\n

This was a small condensation of stars. In my 32 mm eyepiece, it could fit in the same view with M17. I plotted 10 stars in the main body, but that could be 13 if you count a little further out.<\/p>\n

Object Information:<\/b><\/p>\n

M24 is a loose, poorly populated cluster with an agreed Trumpler type of II3pn. It lies about 4,900 light years away and is about 17 light years in diameter. Its hottest stars are B3 stars, indicating a young cluster that is about 32 million years old.<\/p>\n

M24 was discovered by Charles Messier in 1764.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Subject<\/b><\/td>\nM18 (NGC 6613)<\/td>\n<\/tr>\n
Classification<\/b><\/td>\nOpen Cluster (Type d)<\/td>\n<\/tr>\n
Position*<\/b><\/td>\nSagittarius [RA: 18:19:54 \/ Dec: -17:08:00]<\/td>\n<\/tr>\n
Size*<\/b><\/td>\n9.0′<\/td>\n<\/tr>\n
Brightness*<\/b><\/td>\n7.5<\/td>\n<\/tr>\n
Date\/Time<\/b><\/td>\nOctober 22, 2005 – 8:00 PM
\n(October 23, 2005 – 03:00 UT)<\/td>\n<\/tr>\n
Observing Loc.<\/b><\/td>\nFlagstaff, AZ – Home<\/td>\n<\/tr>\n
Instrument<\/b><\/td>\nOrion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n
Eyepieces\/Mag.<\/b><\/td>\n25 mm (48X)<\/td>\n<\/tr>\n
Conditions<\/b><\/td>\nClear, calm<\/td>\n<\/tr>\n
Seeing<\/b><\/td>\n3\/10 Pickering<\/td>\n<\/tr>\n
Transparency<\/b><\/td>\nMag 4.5 NELM (based on 36-Capricornus)<\/td>\n<\/tr>\n
Sources<\/b><\/td>\nSEDS<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

*Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"

M018<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[16,18,24,19,21,25,22,23,15],"tags":[],"class_list":["post-207","post","type-post","status-publish","format-standard","hentry","category-deep-sky","category-messier","category-open-cluster","category-sg-deep-sky","category-sg-messier","category-sg-open-cluster","category-sg-star-cluster","category-sgc-sagittarius","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":203,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/21\/m23\/","url_meta":{"origin":207,"position":0},"title":"Messier 23","author":"jperez1690","date":"October 21, 2005","format":false,"excerpt":"M023","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":115,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/03\/11\/m48\/","url_meta":{"origin":207,"position":1},"title":"Messier 48","author":"jperez1690","date":"March 11, 2005","format":false,"excerpt":"M048","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":202,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/21\/m21\/","url_meta":{"origin":207,"position":2},"title":"Messier 21","author":"jperez1690","date":"October 21, 2005","format":false,"excerpt":"M021","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":78,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/01\/15\/m41\/","url_meta":{"origin":207,"position":3},"title":"Messier 41","author":"jperez1690","date":"January 15, 2005","format":false,"excerpt":"M041","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":110,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/02\/13\/m34\/","url_meta":{"origin":207,"position":4},"title":"Messier 34","author":"jperez1690","date":"February 13, 2005","format":false,"excerpt":"M034","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":184,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/09\/25\/m57_the_ring_ne_1\/","url_meta":{"origin":207,"position":5},"title":"Messier 5","author":"jperez1690","date":"September 25, 2005","format":false,"excerpt":"M005","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/comments?post=207"}],"version-history":[{"count":1,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/207\/revisions"}],"predecessor-version":[{"id":776,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/207\/revisions\/776"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}