ASTRO: The Spider Galaxy, UGC 5829

UGC 5829, often called The Spider Galaxy, is an irregular galaxy in Leo
Minor about 42 million light-years away. Though the one and only
Tully-Fisher measurement puts it much closer at 26 million light-years.
While NED lists a bright spot in the galaxy as a part of the galaxy it
lists another as a separate galaxy. I rather doubt this but I suppose
it is possible so have noted it in the annotated image. NED classes it
as Im, that is an irregular galaxy of the Magellanic type like our
Magellanic Clouds. Still two older notes at NED refer to it as a
"Large, disrupted spiral." and "May be low density spiral like NGC
4236." I took NGC 4236 in 2008 and have attached it for comparison. I
really don't see the similarity. If it is a disrupted spiral could the
object NED shows as a separate galaxy, SDSS J104245.20+342738.4, be the
cause? Seems a stretch as it is more likely a star cloud in the galaxy
and if separate apparently has too little mass to disrupt anything as
big as this galaxy. Still I've pointed it out just in case.

To the northwest of UGC 5829 is a huge split arm spiral galaxy Arp
didn't include in his split arm classification. It is KUG 1039+347A/PGC
031873. Red shift puts it 790 million light-years away. I measure it
at 44.3" of arc across. That comes to 170,000 light-years for its
diameter. Must be a spectacular sight for those with a much closer view.

14" LX200R @ f/10, L=8x10' RB=4x10'x3 G=3x10'x3, STL-11000XM, Paramount ME

Rick
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