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SN 2013aa seems quite remote into the halo of 5643, 2x beyond the last
visible traces of spiral arms and roughly 4x the virial radius. Even
though the spectral data recorded thus far and dist modulus indicate the
SN is part of the galaxy, it's the first time I recall a 1a occurring so
seemingly remote from its host galaxy. 5643 was included on several
watch lists of Sey2 galaxies for possible SN activity starting in 1997.
Proposals for HST time go back to 1995, so it's been an object of
curiosity for quite awhile. It's a dusty SBc with an an elongated and obscured core that doesn't fully meet Sey2 criteria (hence its designation "Sey2-like"). Now this, a 1a that to my understanding has
occurred far out in the galactic boonies where there's very low gas and
dust density, not much in the way of magnetohydodynamic turbulence, and no visible bar torque or recent interactivity with another high-mass object. Could 2013aa be in a faint dwarf orbiting 5643?
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