Strottner-Drechsler 137 (aka EGB 9) in Canis Minor (Marcel Drechsler)

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

Image of the day 05/13/2021

Strottner-Drechsler 137 (aka EGB 9) in Canis Minor, Marcel Drechsler

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Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

Link: http://deeplook.astronomie.at/stdr%20137%20-%20alkor.htm

Image of the day 05/13/2021

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Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

Link: http://deeplook.astronomie.at/stdr%20137%20-%20alkor.htm

NEW CONFIRMED PLANETARY NEBULA STROTTNER-DRECHSLER 137

Discoverers: Marcel Drechsler and Xavier Strottner

Photo: Markus Blauensteiner (Ursa Major Observatory, part of ROSA, France)

Image processing: Marcel Drechsler

H-alpha 52x600, OIII 51x600, RRG 75x300, Lum 24x300

25,4h total exposure

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.

Telescope: Lacerta Newton 10" f/4

Camera: Starlight Xpress Trius 694 mono

Mount: 10 Micron GM2000 HPS II, unguided

Filter: Baader OIII 8,5nm · Baader Ha 7mm · LRGB

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Image of the day 05/13/2021

Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

Image of the day 05/13/2021

Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

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Image of the day 05/13/2021

Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

Image of the day 05/13/2021

Strottner-Drechsler 137 (aka EGB 9) in Canis Minor

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