Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN (Markus Blauensteiner)

Celestial hemisphere: Northern · Constellation: Canis Minor (CMi)

Image of the day 02/15/2021

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Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

Link: https://celestialphotographer.com/stdr%20137%20-%20alkor.htm

Image of the day 02/15/2021

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Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

Link: https://celestialphotographer.com/stdr%20137%20-%20alkor.htm

EGB 9 was discovered by Ellis, Grayson & Bond in 1984. For a long time the well visible blue star in the center was considered as the central star or as the star which brings the nebula to emission. After its discovery and the "downgrading" as a "normal" ionized interstellar medium EGB9 fell into a 36 years long slumber. It was not until 2020 that anything happened again around EGB9. Xavier Strottner and Marcel Drechsler found another suitable star (as central star) near the nebula center. Its properties fit better to a PN-forming white dwarf, especially since the "original" central star with ~8800 K is clearly too cold. In the course of the long exposure outer shells could be detected, so that the diameter of the nebula can be fixed with at least 13'. Under the corresponding link on my website the positions of the "old" and "new" central star can be compared.Lionel Mulato made a spectrum of the nebula, which looks like the typical spectrum of a PN. Also at the end of 2020 the first image of EGB 9 alias StDr 137 could be taken by me and processed by Marcel Drechsler. From the current point of view it can be suggested that EGB 9 is a PN and therefore can be used as a new, further designation StDr 137.

[OIII] 38x10 min, Ha 44x10 min, RGB 18x5 min per filter, total 18 h 10 min;

image acquisition and pre-processing by Markus Blauensteiner;

the great image editing was done by Marcel Drechsler;

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Status	Advanced success
Started	...
Astrometry.net job	4200127
PixInsight job	HMEBCG96CVR4KJ8XVG9HW1A8JBCWM699
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	07h19m08s.241
RA (top/left)	07h20m21s.630
RA (top/right)	07h17m53s.897
RA (bottom/right)	07h17m55s.498
RA (bottom/left)	07h20m22s.393

Dec (center)	+07°21′01″.91
Dec (top/left)	+07°35′03″.31
Dec (top/right)	+07°34′36″.44
Dec (bottom/right)	+07°06′57″.98
Dec (bottom/left)	+07°07′27″.94

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Image of the day 02/15/2021

Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

Image of the day 02/15/2021

Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

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Image of the day 02/15/2021

Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

Image of the day 02/15/2021

Strottner-Drechsler 137 - aka EGB 9 in Canis Minor - new classified PN

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