{"id":219,"date":"2005-12-29T10:15:00","date_gmt":"2005-12-29T10:15:00","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2005\/12\/29\/asteroid_3_juno\/"},"modified":"2021-11-27T23:24:40","modified_gmt":"2021-11-27T23:24:40","slug":"asteroid_3_juno","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2005\/12\/29\/asteroid_3_juno\/","title":{"rendered":"Asteroid 3 Juno"},"content":{"rendered":"<p style=\"text-align: center\"><a href=\"javascript:myVoid()\" onmouseover=\"rollover('img2005123001')\" onmouseout=\"rollout('img2005123001')\"><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2005\/img2005123001_JunoA.jpg\" name=\"img2005123001\" alt=\"Step 1\" border=\"1\" color=\"FFFFFF\"><\/a><br \/>\n<script type=\"text\/javascript\"><br \/>\n<!--\nsetrollover(\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2005\/img2005123001_JunoB.jpg\");\n\/\/--><br \/>\n<\/script><\/p>\n<p><i>Move mouse over image to see labels.<\/i><\/p>\n<p><b>Observation Notes:<\/b><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.perezmedia.net\/beltofvenus\/archives\/images\/2005\/img2005123001_Junofinder.jpg\" border=\"1\" color=\"ffffff\" align=\"right\">This was my first attempt ever at an asteroid observation. I tried finding 3 Juno based on the data supplied in Orion&#8217;s TheSky software, and I hunted in vain. I checked the data at the Minor Planet Ephemeris Service and it seems the Juno data in TheSky is off by more than 1 degree. Anyway, after star hopping to the new coordinates, a bright &#8216;star&#8217; showed up in the spot Juno should occupy. It was just north of a line drawn between 6.25 magnitude SAO131625 and 9.21 magnitude SAO131652 and about 75% of the distance from &#8216;625 to &#8216;652. It was bracketed in brightness by these two stars also, and I estimated it at 8th magnitude. The ephemeris noted a magnitude of 7.8 (woo!). The first position sketched at 05:15 UT is about RA 04:58:40 \/ Dec. -00:58:20. I checked back 3 and a half hours later and found it had moved slightly northwest. This second position marked at 08:45 UT was about RA 04:58:35 \/ Dec. -00:57:30.<\/p>\n<p>I was surprised at how bright the asteroid was. I&#8217;ll be hunting down others as the opportunity presents itself. I&#8217;ll just have to rely on the Minor Planet Ephemeris Service for accurate positions.<\/p>\n<p><b>Factoids:<\/b><\/p>\n<p>Asteroid 3 Juno was discovered by Karl L. Harding on September 1, 1804. It is one of the largest main belt asteroids and is &#8216;S-Type&#8217;, which means it is composed of nickel-iron, iron, and magnesium silicates, and is highly reflective. Imaging from the Hooker Telescope in 2003 reveals that Juno has an irregular, potato-like shape, and possesses a 100 km diameter crater that occurred relatively recently. Spectroscopic analysis suggests that Juno could be the source of stony meteorites known as chondrites which are composed of olivine and pyroxene.<\/p>\n<table width=\"470\" border=\"1\" cellspacing=\"0\" cellpadding-left=\"4\">\n<tbody>\n<tr>\n<td><b>Subject<\/b><\/td>\n<td>3 Juno<\/td>\n<\/tr>\n<tr>\n<td><b>Classification<\/b><\/td>\n<td>Main Belt Asteroid<\/td>\n<\/tr>\n<tr>\n<td><b>Position*<\/b><\/td>\n<td>Orion: Position 1: [RA: ~ 04:58:40 \/ Dec: ~ -00:58:20]<br \/>\nPosition 2: [RA: ~ 04:58:35 \/ Dec: ~ -00:57:30]<\/td>\n<\/tr>\n<tr>\n<td><b>Apparent Size*<\/b><\/td>\n<td>N\/A<\/td>\n<\/tr>\n<tr>\n<td><b>Brightness*<\/b><\/td>\n<td>7.8 Vmag<\/td>\n<\/tr>\n<tr>\n<td><b>Diameter*<\/b><\/td>\n<td>240 km<\/td>\n<\/tr>\n<tr>\n<td><b>Mass*<\/b><\/td>\n<td>20,000 x 10<sup>15<\/sup> kg<\/td>\n<\/tr>\n<tr>\n<td><b>Rotational Period*<\/b><\/td>\n<td>7.21 hrs<\/td>\n<\/tr>\n<tr>\n<td><b>Orbital Period*<\/b><\/td>\n<td>4.36 yrs<\/td>\n<\/tr>\n<tr>\n<td><b>Date\/Time<\/b><\/td>\n<td>Position 1: December 30, 2005 &#8211; 05:15 UT<br \/>\nPosition 2: December 30, 2005 &#8211; 08:45 UT<\/td>\n<\/tr>\n<tr>\n<td><b>Observing Loc.<\/b><\/td>\n<td>Flagstaff, AZ &#8211; Home<\/td>\n<\/tr>\n<tr>\n<td><b>Instrument<\/b><\/td>\n<td>Orion SVP 6LT Reflector (150 mm dia.\/1200 mm F\/L)<\/td>\n<\/tr>\n<tr>\n<td><b>Eyepieces\/Mag.<\/b><\/td>\n<td>25 mm Sirius Pl\u00c3\u00b6ssl (48X)<\/td>\n<\/tr>\n<tr>\n<td><b>Conditions<\/b><\/td>\n<td>Clear, calm<\/td>\n<\/tr>\n<tr>\n<td><b>Seeing<\/b><\/td>\n<td>3-4\/10 Pickering<\/td>\n<\/tr>\n<tr>\n<td><b>Transparency<\/b><\/td>\n<td>Mag 6.0+ (SAO 112206)<\/td>\n<\/tr>\n<tr>\n<td><b>Sources<\/b><\/td>\n<td><a href=\"http:\/\/nssdc.gsfc.nasa.gov\/planetary\/factsheet\/asteroidfact.html\" target=\"_blank\" rel=\"noopener\">NASA Asteroid Fact Sheet<\/a>, <a href=\"http:\/\/www.answers.com\/topic\/3-juno\" target=\"_blank\" rel=\"noopener\">Answer.com<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>* Based on published data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>3 Juno<\/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":[44,87,69,15],"tags":[],"class_list":["post-219","post","type-post","status-publish","format-standard","hentry","category-planetary","category-sg-asteroid","category-sg-planetary","category-sketch-gallery"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":562,"url":"https:\/\/perezmedia.net\/beltofvenus\/2011\/03\/02\/juno_target_mis\/","url_meta":{"origin":219,"position":0},"title":"Juno Target Missile Launch &#8211; March 2, 2011","author":"jperez1690","date":"March 2, 2011","format":false,"excerpt":"Juno Target Missile Launch","rel":"","context":"In &quot;Artificial Satellite&quot;","block_context":{"text":"Artificial Satellite","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/artificial-satellite\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":223,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/01\/07\/january_7_updat\/","url_meta":{"origin":219,"position":1},"title":"January 7 Update","author":"jperez1690","date":"January 7, 2006","format":false,"excerpt":"As you've probably noticed, things haven't been very busy in the realm of astronomy around here lately. Over the past month, I did manage to make 1 minor planet and 3 DSO observations. I've added them as follows: M50 M29 Asteroid 3 Juno NGC 869 and NGC 884 (The Double\u2026","rel":"","context":"In &quot;General&quot;","block_context":{"text":"General","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/general\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":191,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/10\/01\/ngc_1514\/","url_meta":{"origin":219,"position":2},"title":"NGC 1514","author":"jperez1690","date":"October 1, 2005","format":false,"excerpt":"NGC 1514","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":296,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/10\/27\/ngc_2440\/","url_meta":{"origin":219,"position":3},"title":"NGC 2440","author":"jperez1690","date":"October 27, 2006","format":false,"excerpt":"NGC 2440","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":188,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/09\/25\/ngc_7293_the_he\/","url_meta":{"origin":219,"position":4},"title":"NGC 7293 &#8211; The Helix Nebula","author":"jperez1690","date":"September 25, 2005","format":false,"excerpt":"NGC 7293","rel":"","context":"In &quot;Deep Sky&quot;","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":421,"url":"https:\/\/perezmedia.net\/beltofvenus\/2008\/07\/24\/ngc_6891\/","url_meta":{"origin":219,"position":5},"title":"NGC 6891","author":"jperez1690","date":"July 24, 2008","format":false,"excerpt":"NGC 6891","rel":"","context":"In &quot;Deep Sky&quot;","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\/219","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=219"}],"version-history":[{"count":1,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/219\/revisions"}],"predecessor-version":[{"id":780,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/219\/revisions\/780"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}