Planetary Nebula LoTr 5 in HOO (M.J. Post)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: PK339+88.1

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Planetary Nebula LoTr 5 in HOO

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Planetary Nebula LoTr 5 in HOO

LoTr 5 holds, or nearly holds, several records. It is farthest from the galactic plane of any other planetary, with a galactic latitude of 88.5 degrees (nearly at our galaxy's north pole!). So its expelled gases will not react soon with any interstellar gas or dust. It is one of the largest known planetaries at 1.8 light years in breadth, making it one of the faintest as well. It's emissions consist mainly of oxygen light (O III filter), but I did catch a bit of H-alpha as well. It was discovered by Longmire and Tritton in 1980.

This nebula is bipolar, meaning the central star is off-center because the eastern lobe is coming towards us while the western lobe (the arc to the right) is receding from us. Bipolarity is caused by a binary star system in the middle - they orbit one another every 2700 days (7.4 years). But the system is variable with a period of 6 days. Explanation: That is the rotation period of the dominant barium star, and it has massive sunspots that are 600K cooler than the rest of the star's surface. So this is a peculiar and interesting target high in the sky (in Coma Berenices).

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Unknown

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Status	Advanced success
Started	...
Astrometry.net job	4473921
PixInsight job	X3QL35AIURU6ZKPQI07ZP6O0GPJU5YUE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h55m35s.27
RA (top/left)	12h57m20s.48
RA (top/right)	12h53m52s.64
RA (bottom/right)	12h53m50s.80
RA (bottom/left)	12h57m17s.63

Dec (center)	+25°53′17″.4
Dec (top/left)	+26°08′23″.4
Dec (top/right)	+26°09′09″.1
Dec (bottom/right)	+25°38′07″.1
Dec (bottom/left)	+25°37′19″.7

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Planetary Nebula LoTr 5 in HOO

Planetary Nebula LoTr 5 in HOO

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Planetary Nebula LoTr 5 in HOO

Planetary Nebula LoTr 5 in HOO

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