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NGC 7635 THE BUBBLE NEBULA

NGC     7635,     also     called     the     Bubble     Nebula, Sharpless    162,    or    Caldwell    11,    is    a    H    II    region emission   nebula   in   the   constellation   Cassiopeia. It   lies   close   to   the   direction   of   the   open   cluster Messier   52.   The   "bubble"   is   created   by   the   stellar wind   from   a   massive   hot,   8.7   magnitude   young central     star,     SAO     20575     (BD+60°2522).     The nebula    is    near    a    giant    molecular    cloud    which contains    the    expansion    of    the    bubble    nebula while   itself   being   excited   by   the   hot   central   star, causing   it   to   glow.   It   was   discovered   in   1787   by William      Herschel.      The      star      BD+60°2522      is thought to have a mass of about 44 M☉. With    an    8    or    10-inch    (250    mm)    telescope,    the nebula   is   visible   as   an   extremely   faint   and   large shell around the star. The    nearby    7th    magnitude    star    on    the    west hinders     observation,     but     one     can     view     the nebula   using   averted   vision.[6]   Using   a   16   to   18- inch   (460   mm)   scope,   one   can   see   that   the   faint nebula   is   irregular,   being   elongated   in   the   north south direction.

NGC 7635 THE BUBBLE NEBULA

Place:        Ager-Lleida-Spain SQM:         21.5 Dates:       06-07-SEP / 30-31 OCT / 2-6 DEC 2016 Details Telescope:  GSO RC14 Truss Mount:        ASA DDM85 Camera:      Moravian G3-11000 Focuser:      Feather Touch 3 Kit Boss II Flattener:    TS 2.5 Filters:         Astrodon LRGB Gen2 I-Series True-Balance Exposure:    L:14x600 sec bin1                       RGB: 34x300 sec bin2                       H-Alpha: 26x900 sec bin1 Processing:   Pixinsight & Photoshop CC Software:     MaximDL, Sequence,Autoslew Control Remote:  Talon6

Nebula

& Dust