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NEW DISCOVERY: StDr Object 21, 



    
        

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NEW DISCOVERY: StDr Object 21, 



    
        

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NEW DISCOVERY: StDr Object 21

Imaging telescopes or lenses: Takahashi FSQ-85ED  ·  Edge HD 1100

Imaging cameras: ZWO ASI 6200 MM Pro  ·  Moravian G3-16200FW-S7

Mounts: 10micron GM3000 HPS

Guiding cameras: Unguided

Focal reducers: Starizona Hyperstar 4 C11 f/1.9

Software: PixInsight  ·  Fitswork  ·  Maxim DL  ·  PS CS3

Filters: Baader Ha HighSpeed f/2 Filter 2''  ·  Baader O3 HighSpeed f/2 Filter 2''  ·  Baader LRGB 2" unmounted


Dates:Aug. 21, 2020

Frames: 102x600"

Integration: 17.0 hours

Avg. Moon age: 2.70 days

Avg. Moon phase: 8.02%


Astrometry.net job: 3969685

RA center: 4h 26' 29"

DEC center: +48° 21' 26"

Pixel scale: 1.687 arcsec/pixel

Orientation: -0.648 degrees

Field radius: 0.302 degrees


Resolution: 1024x785

Locations: Dachsternwarte, Ingolstadt, Bayern, Germany

Data source: Backyard

Description

20.AUG.2020 - Celestron Edge HD 1100 + Hyperstar v4 + ASI6200MM Pro
38 x 600s Baader Ha HighSpeed f/2 Filter

21.AUG.2020 - Celestron Edge HD 1100 + Hyperstar v4 + ASI6200MM Pro
33 x 600s Baader O3 HighSpeed f/2 Filter
-> no recognizable signal in O3

20-21.AUG - Takahashi FSQ-85 + Moravian G2-8300 FW
81 x 120s a Astronomik LRGB

StDr Object 21 discovered by Xavier Strottner and Marcel Drechsler.
---------------------------------------------------------------------------------------------

The nature of the nebula is not 100% clear.
It is probably the shock front of a white dwarf, which races through the interstellar medium
at high speed and thereby ionizes the surrounding gas.


Description:
- White dwarf of a once low-mass star.
- The star has an extremely high proper motion, which explains the elongated shape of the structure.
- It's likely that the white dwarf originates from a binary system
- Southern shock arc with a long extension to the north
- no OIII signal

Central star:
- Cool White Dwarf PM J04263 + 4820 (WDJ042623.59 + 482009.85)
- Very high speed CSPN
- proper motion: RA 37.540 / DEC -123.155 (GAIA)
- Distance: 107 parsec
- temperature: 8874.41K
- white dwarf probability: 86.44%.
- Mass (sun): 0.143853
- Magnitude: 15.992619
- UV-ratio: far UV 16.92 / near UV 16.97

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NEW DISCOVERY: StDr Object 21, 



    
        

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