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© iasoberg.com 2013

Where Is the Solar System Barycenter?

In   a   single   star   system   like   ours,   most   of   the   time   (but   not   always),   the   barycenter   is   located   somewhere   within     the   star   itself.   However,   most   barycenters   continuously   change   as   massive   objects   (like   planets)   orbit   a   star.      If an   unusual   alignment   happens   where   a   large      percentage of   mass   is   on   one   side   of   the   star,   the      barycenter   can exist    outside    of    the    star’s    radius.    In    cases    of    2    star systems,   the   barycenter   will   be   located      between   the two   stars.   If   the   stars   aren’t   of   the   same      mass,   the barycenter   will   be   closer   to   the   heavier,   or   more   massive     one.   Now   you   will   note   in   the   diagram   that   there   is   a     coordinate   system   (x   y   axis)   to   the   far   right   on   the   x   axis     is   the   First   point   of   Aries   0   degrees   celestial   longitude.     You   will   also   note   a   faint   dashed   yellow   line   that   is   the     circumference   or   outer   edge   of   the   Sun.   So   the   solar     system   barycenter   and   the   sun's   location   are   dependent     on   the   motion   of   the   planets   and   other   massive   objects     in    the    solar    system.        And    if    you    want    all    the    gory detailed   data   re   the   position   down   to   the   .00000001   of   a degree longitude you can go here .

What is a Barycenter?

Barycenter   is   a   term   that   is   used   to   describe   the   mass   center   of   2   or   more   celestial   bodies,   i.e.   stars   and   planets and/or   a   planet   and   moon(s).      The   solar   system   barycenter   and   Earth   Moon   system   barycenter   are   described below.

The Earth Doesn’t Actually Orbit The Sun?

You   were   taught   that   Earth   and   other   planets   in   our   solar   system   orbit   the   sun,   and   that   our   solar   system   orbits     the   center   of   the   Milky   Way.   Did   your   science   teacher   have   it   wrong?   Is   everything   you’ve   learned   about   physics     and   gravity   wrong?      The   Earth   Doesn’t   Actually   Orbit   The   Sun?   For   all   practical   purposes,   what   you   were   taught wasn’t   entirely   wrong.   The   Earth   does   in   fact   orbit   the   sun.   In      the   strictest   sense,   however,   it   doesn’t.   The   sun and   other   planets   each   have   their   own   gravity   well   which   interact   and   pull   on   one   another.   The   result   of   this phenomenon   is   that   everything   in   an   obital   system   (like   our   solar   system)   orbits   the   center   of   mass   of   the system.   This      ‘center   of   mass’   of   the   solar   system   is   called   the   solar   system   barycenter.   The   Earth,   the   sun   and everything else in our solar system orbit this  barycenter – not the sun.
Trace of Pendulum
iasoberg
Barycenter 101
Solar Barycenter Chart courtesy of R L McNish Calgary Centre of the Royal Astronomical Society of Canada.

Where Is the Earth Moon System Barycenter?

Given   the   above   information   regarding   the   solar   system   barycenter,   it   follows   that   the   Moon   doesn’t   revolve   around   the mass   center   of   the   Earth,   it   revolves   around   the   Earth   Moon   System   barycenter.      The   Earth   Moon   System   barycenter   is on   the   axis   between   the   center   of   masses   of   the   Earth   and   Moon.      The   Moon   is   ~   1/82   of   the   mass   of   the   Earth   so   this barycenter   is   about   3000   miles/4800km   from   the   center   of   the   Earth   along   the   axis   between   them   (average   Earth   Moon distance   240,000miles/380,000km).     The   barycenter   of   the   Earth   Moon   System   is   always   within   the   Earth.     The   distance to   the   Moon   also   varies   by   about   30,000miles/50,000km   so   the   location   of   this   barycenter   within   the   earth   will   vary about   380miles/600km   from   a   point   3000miles/4800km   within   the   Earth   during   one   revolution   of   the   Moon   in   29   days.        The   barycenter   and   another   point,   the   anti-barycenter   (equal   distance   from   the   center   of   the   Earth   along   the   Earth Moon   axis   in   the   opposite   direction   to   the   barycenter)   are   two   points   at   which   4   of   the   Iasoberg   bands   (2   bands   per point) are focused.
© iasoberg.com 2013

Where Is the Solar System Barycenter?

In   a   single   star   system   like   ours,   most   of   the   time   (but   not   always), the    barycenter    is    located    somewhere    within        the    star    itself. However,   most   barycenters   continuously   change   as   massive   objects (like   planets)   orbit   a   star.      If   an   unusual   alignment   happens   where   a large      percentage   of   mass   is   on   one   side   of   the   star,   the      barycenter can   exist   outside   of   the   star’s   radius.   In   cases   of   2   star   systems,   the barycenter   will   be   located      between   the   two   stars.   If   the   stars aren’t   of   the   same      mass,   the   barycenter   will   be   closer   to   the heavier,   or   more   massive      one.   Now   you   will   note   in   the   diagram that   there   is   a      coordinate   system   (x   y   axis)   to   the   far   right   on   the   x axis      is   the   First   point   of   Aries   0   degrees   celestial   longitude.      You will   also   note   a   faint   dashed   yellow   line   that   is   the      circumference or   outer   edge   of   the   Sun.   So   the   solar      system   barycenter   and   the sun's   location   are   dependent      on   the   motion   of   the   planets   and   other massive   objects      in   the   solar   system.      And   if   you   want   all   the   gory detailed   data   re   the   position   down   to   the   .00000001   of   a   degree longitude you can go here .

What is a Barycenter?

Barycenter   is   a   term   that   is   used   to   describe   the   mass   center   of   2   or more   celestial   bodies,   i.e.   stars   and   planets   and/or   a   planet   and moon(s).        The    solar    system    barycenter    and    Earth    Moon    system barycenter are described below.

The Earth Doesn’t Actually Orbit The Sun?

You   were   taught   that   Earth   and   other   planets   in   our   solar   system orbit   the   sun,   and   that   our   solar   system   orbits      the   center   of   the Milky   Way.   Did   your   science   teacher   have   it   wrong?   Is   everything you’ve   learned   about   physics      and   gravity   wrong?     The   Earth   Doesn’t Actually   Orbit   The   Sun?   For   all   practical   purposes,   what   you   were taught   wasn’t   entirely   wrong.   The   Earth   does   in   fact   orbit   the   sun. In      the   strictest   sense,   however,   it   doesn’t.   The   sun   and   other planets   each   have   their   own   gravity   well   which   interact   and   pull   on one   another.   The   result   of   this   phenomenon   is   that   everything   in   an obital   system   (like   our   solar   system)   orbits   the   center   of   mass   of   the system.   This      ‘center   of   mass’   of   the   solar   system   is   called   the   solar system   barycenter.   The   Earth,   the   sun   and   everything   else   in   our solar system orbit this  barycenter – not the sun.
Trace of Pendulum
iasoberg
Barycenter 101
Solar Barycenter Chart courtesy of R L McNish Calgary Centre of the Royal Astronomical Society of Canada.

Where Is the Earth Moon System Barycenter?

Given   the   above   information   regarding   the   solar   system   barycenter, it   follows   that   the   Moon   doesn’t   revolve   around   the   mass   center   of the   Earth,   it   revolves   around   the   Earth   Moon   System   barycenter.     The    Earth    Moon    System    barycenter    is    on    the    axis    between    the center   of   masses   of   the   Earth   and   Moon.      The   Moon   is   ~   1/82   of   the mass   of   the   Earth   so   this   barycenter   is   about   3000   miles/4800km from   the   center   of   the   Earth   along   the   axis   between   them   (average Earth   Moon   distance   240,000miles/380,000km).      The   barycenter   of the   Earth   Moon   System   is   always   within   the   Earth.      The   distance   to the    Moon    also    varies    by    about    30,000miles/50,000km    so    the location    of    this    barycenter    within    the    earth    will    vary    about 380miles/600km   from   a   point   3000miles/4800km   within   the   Earth during   one   revolution   of   the   Moon   in   29   days.         The   barycenter   and another   point,   the   anti-barycenter   (equal   distance   from   the   center of   the   Earth   along   the   Earth   Moon   axis   in   the   opposite   direction   to the   barycenter)   are   two   points   at   which   4   of   the   Iasoberg   bands   (2 bands per point) are focused.