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Binary Star Orbits

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21 years 5 months ago #813 by gnason
Replied by gnason on topic Re: Binary Star Orbits

Hi,
Is it possible for a binary system to exist there one of the stars is travelling in the opposite direction along its orbit, or would this be too unstable and end up with both stars flying off in oposite directions f it were to happen?Cheers,~Al


Al,

Interesting thoughts but in reality, I cannot see how this scenario could happen. Binary stars are subject to Kepler’s Laws and, as you say, have elliptical orbits around their common centre of mass.

In other words, the two stars will always be at opposite ends of a straight line through the centre of mass. This would not be possible if the stars were orbiting in opposite directions.

Gordon

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21 years 5 months ago #814 by owen
Replied by owen on topic Re: Binary Star Orbits
Al

I have to agree with Gordon. In fact, if you consider two stars and a centre of mass, then the centre of mass is only a construct we use to provide a handy frame of reference. So ... if you get rid of the CM, you have one star orbiting another, and the direction is immaterial.

Now if you asked about a system of multiple stars, that would be more interesting!

Owen

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21 years 5 months ago #816 by michaeloconnell
Replied by michaeloconnell on topic Re: Binary Star Orbits
I think I understand what you're saying Gordon. Just so as i understand this concept of centre of gravity completely, if you have two stars orbiting each other, the centre of gravity is proportional to their respective mass and distance between them; is that correct?

Now, if you move the stars apart so as to increase their seperation by a factor of two, does the centre of gravity move and by how much? (assuming say, that one star is twice the mass of the other)

Do two objects have to be in orbit about each other for there to be a centre of gravity? Is there a centre of gravity between our Sun and say Proxima Centauri?

Thanks,

Michael

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  • SELECT a.id FROM `tifas_kunena_messages` AS `a` WHERE `thread` = '799' AND `a`.`hold` IN (0) ORDER BY a.`time` ASC LIMIT 6, 6176μs568B/libraries/kunena/src/Database/Object/KunenaFinder.php:234Copy
  • SELECT m.*, t.message FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages_text` AS `t` ON m.id = t.mesid WHERE `m`.`id` IN (813,814,816)463μs2.56KB/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:120Copy
  • SELECT * FROM `tifas_kunena_thankyou` WHERE `postid` IN (813,814,816)112μs688B/libraries/kunena/src/Forum/Message/Thankyou/KunenaMessageThankyouHelper.php:116Copy
  • SELECT u.name, u.username, u.email, u.block AS blocked, u.registerDate, u.lastvisitDate, ku.*, u.id AS userid FROM `tifas_users` AS `u` LEFT JOIN `tifas_kunena_users` AS `ku` ON `u`.`id` = `ku`.`userid` WHERE `u`.`id` IN (89,102,95)251μs25.03KB/libraries/kunena/src/User/KunenaUserHelper.php:247Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (813,814,816)113μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_user_topics` WHERE (`user_id` = '0') AND (`topic_id` IN (799))104μs1.27KB/libraries/kunena/src/Forum/Topic/User/KunenaTopicUserHelper.php:159Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_user_topics`316μs1.42KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT u.name, u.username, u.email, u.block as blocked, u.registerDate, u.lastvisitDate, ku.* FROM `tifas_users` AS `u` LEFT JOIN `tifas_kunena_users` AS `ku` ON `u`.`id` = `ku`.`userid` WHERE `u`.`id` = '69'221μs24.97KB/libraries/kunena/src/Tables/KunenaUsers.php:575Copy
  • SELECT `code`,`location` FROM `tifas_kunena_smileys`82μs960B/libraries/kunena/src/BBCode/KunenaBBCode.php:1122Copy
  • UPDATE `tifas_kunena_topics` SET `hits` = (`hits` + 1) WHERE `id` = '799'400μs48B/libraries/src/Table/Table.php:1325Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `tifas_modules` AS `m` LEFT JOIN `tifas_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `tifas_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) ORDER BY `m`.`position`,`m`.`ordering`626μs1.86KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_polls`303μs1.33KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_ranks`108μs1.48KB/libraries/kunena/src/User/KunenaUser.php:1629Copy
  • SELECT userid, MAX(time) AS time FROM `tifas_session` WHERE `client_id` = 0 AND `userid` > 0 AND `time` > '1744592595' GROUP BY `userid` ORDER BY `time` DESC156μs576B/libraries/kunena/src/User/KunenaUserHelper.php:544Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (813)106μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (813)102μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (813) GROUP BY `m`.`id`,`mm`.`hold`213μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (814)117μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (814)104μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id, SUM(mm.time<m.time) AS before_count, SUM(mm.time>m.time) AS after_count FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread` WHERE `m`.`id` IN (814) GROUP BY `m`.`id`,`mm`.`hold`238μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (816)101μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (816)103μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM tifas_fields AS a LEFT JOIN `tifas_languages` AS l ON l.lang_code = a.language LEFT JOIN tifas_users AS uc ON uc.id=a.checked_out LEFT JOIN tifas_viewlevels AS ag ON ag.id = a.access LEFT JOIN tifas_users AS ua ON ua.id = a.created_user_id LEFT JOIN tifas_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray2)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC665μs4.03KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT * FROM `tifas_kunena_announcement` WHERE `published` = 1 AND (`publish_up` = '1000-01-01 00:00:00' OR `publish_up` <= '2025-04-14 01:33:15') AND (`publish_down` ='1000-01-01 00:00:00' OR `publish_down` >= '2025-04-14 01:33:15') ORDER BY `id` DESC LIMIT 1113μs1.42KB/libraries/kunena/src/Forum/Announcement/KunenaAnnouncementHelper.php:145Copy
  • SHOW FULL COLUMNS FROM `tifas_jev_users`431μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `tifas_categories` AS `c` WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 ORDER BY `c`.`lft`272μs3.91KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' ORDER BY c.lft asc175μs584B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' AND ((c.lft>=87 AND c.rgt<=88 )) ORDER BY c.lft asc178μs536B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT ev.ev_id FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-16 00:00:00' AND ev.created <= '2025-10-11 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) GROUP BY ev.ev_id ORDER BY ev.created DESC LIMIT 10836μs520B/components/com_jevents/libraries/dbmodel.php:271Copy
  • SELECT rpt.*, ev.*, rr.*, det.*, ev.state as published, ev.created as created , YEAR(rpt.startrepeat) as yup, MONTH(rpt.startrepeat ) as mup, DAYOFMONTH(rpt.startrepeat ) as dup , YEAR(rpt.endrepeat ) as ydn, MONTH(rpt.endrepeat ) as mdn, DAYOFMONTH(rpt.endrepeat ) as ddn , HOUR(rpt.startrepeat) as hup, MINUTE(rpt.startrepeat ) as minup, SECOND(rpt.startrepeat ) as sup , HOUR(rpt.endrepeat ) as hdn, MINUTE(rpt.endrepeat ) as mindn, SECOND(rpt.endrepeat ) as sdn FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-16 00:00:00' AND ev.created <= '2025-10-11 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) AND ev.ev_id IN (0) ORDER BY ev.created DESC , rpt.startrepeat ASC303μs10.33KB/components/com_jevents/libraries/dbmodel.php:3274Copy
  • SELECT `name`,`element` FROM `tifas_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1250μs736B/administrator/components/com_finder/src/Helper/LanguageHelper.php:134Copy
  • SELECT `title` FROM `tifas_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1)129μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT * FROM `tifas_banners` WHERE (`reset` <= :date AND `reset` IS NOT NULL) AND (`checked_out` IS NULL OR `checked_out` = :userId)204μs5.39KBParams/administrator/components/com_banners/src/Helper/BannersHelper.php:69Copy
  • SELECT `a`.`id`,`a`.`type`,`a`.`name`,`a`.`clickurl`,`a`.`sticky`,`a`.`cid`,`a`.`description`,`a`.`params`,`a`.`custombannercode`,`a`.`track_impressions`,`cl`.`track_impressions` AS `client_track_impressions` FROM `tifas_banners` AS `a` LEFT JOIN `tifas_banner_clients` AS `cl` ON `cl`.`id` = `a`.`cid` WHERE ( ( (`a`.`state` = 1) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :nowDate1)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :nowDate2)) AND (`a`.`imptotal` = 0 OR `a`.`impmade` < `a`.`imptotal`) AND `a`.`catid` IN (:preparedArray1) ORDER BY `a`.`sticky` DESC, RAND() LIMIT 1419μs2.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • UPDATE `tifas_banners` SET `impmade` = `impmade` + 1 WHERE `id` IN (:preparedArray1)463μs856BParams/components/com_banners/src/Model/BannersModel.php:315Copy
  • UPDATE `tifas_banner_tracks` SET `count` = `count` + 1 WHERE `track_type` = 1 AND `banner_id` = :id AND `track_date` = :trackDate350μs832BParams/components/com_banners/src/Model/BannersModel.php:352Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`next_execution` <= :now ORDER BY `a`.`title` asc247μs3.16KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`locked` IS NOT NULL ORDER BY `a`.`title` asc186μs3.18KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SHOW TABLES718μs8.51KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:678Copy