M94 SPIRAL GALAY & OUTER RING

MMessier   94   (also   known   as   NGC   4736)   is   a   spiral galaxy   in   the   constellation   Canes   Venatici.   It   was discovered     by     Pierre     Méchain     in     1781,     and catalogued    by    Charles    Messier    two    days    later. Although    some    references    describe    M94    as    a barred   spiral   galaxy,   the   "bar"   structure   appears to   be   more   oval-shaped.   The   galaxy   has   two   ring structures. M94   contains   both   an   inner   ring   with   a   diameter of    70    arcseconds    and    an    outer    ring    with    a diameter   of   600   arcseconds.   These   rings   appear to   form   at   resonance   locations   within   the   disk   of the   galaxy.   The   inner   ring   is   the   site   of   strong star      formation      activity      and      is      sometimes referred     to     as     a     starburst     ring.     This     star formation   is   fueled   by   gas   that   is   dynamically driven    into    the    ring    by    the    inner    oval-shaped bar-like structure.
designed  by Lluís Romero Ventura
 The Earth     astrosirius@astrosirius.org 
astrophotographysirius.com

M94 SPIRAL GALAY & OUTER RING

Place:        Ager-Lleida-Spain SQM:         20.8 Dates:       Dec 2016 &  Jan 2017 Details Telescope:  GSO RC14 Truss Mount:        ASA DDM85 Camera:      Moravian G2-8300 Focuser:      Feather Touch 3 Kit Boss II Flattener:    TS 2.5 Filters:         Astrodon LRGB Gen2 I-Series True-Balance Exposure:    L: 39x900 sec bin1                       L: 2x1800 sec binz                       RGB: 19:22:28x600 sec bin1                       RGB: 24:19:18X900 sec bin1                       RGB: 4:4:4x900 sec bin1 Processing:  Pixinsight & Photoshop CC Software:     MaximDL, Sequence,Autoslew Control Remote:  Talon6

Galaxies

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