Palomar 5 (Jim Fordice)

Celestial hemisphere: Southern · Constellation: Serpens (Ser) · Contains: 4 Ser · HD135660 · PGC 1147182 · PGC 1150381 · PGC 1152260 · PGC 1153370 · PGC 1153846 · PGC 1154807 · PGC 1155395 · PGC 1156057 · PGC 165662 · PGC 54456

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Palomar 5

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Palomar 5

I observed this object on 4 October 2021 at the Okie-Tex Star Party using a 22” Obsession UC Dobsonian: The location of this GC was easy to find. I did the observation just as the GC was setting over a hill and just at astronomical twilight. Using both direct and averted vision I could see about 10 of the stars that make up this loose GC. The GC is faint because it is 75,000 LY away. Nice to bag this one!

There is a shredding process of disruption acting on this cluster because of the gravitation of the Milky Way - there are many stars leaving this cluster in the form of a stellar stream (shown in image below). The stream has a mass of 5000 solar masses and is 30,000 light years long. It shows a noticeable amount of flattening, with an aspect ratio of 0.62 ± 0.23 between its semi-major axis and semi-minor axis.

Shapley Sawyer Classification: XII
Distance: 75,026 LY
Type: Far Halo Globular
Position w.r.t. core of galaxy: Above the MY disc and on the far side of the core.
Any stars resolved: Yes
Undergoing Core Collapse: No

Created with SkySafari 6 Pro.

Globular Star Clusters

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Status	Advanced success
Started	...
Astrometry.net job	9388488
PixInsight job	EK05G32VDAQQRWRIWN70JP4UWSDDBWAX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	15h16m05s.103
RA (top/left)	15h17m03s.561
RA (top/right)	15h15m00s.434
RA (bottom/right)	15h15m06s.657
RA (bottom/left)	15h17m09s.786

Dec (center)	-00°06′42″.75
Dec (top/left)	+00°04′43″.52
Dec (top/right)	+00°02′22″.35
Dec (bottom/right)	-00°18′09″.10
Dec (bottom/left)	-00°15′48″.24

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Palomar 5

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