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NEW DISCOVERY: Dr15 (Drechsler 15) in Centaurus

Technical card

Resolution: 4063x4071

Dates:March 13, 2019

Frames: 48x600"

Integration: 8.0 hours

Avg. Moon age: 6.43 days

Avg. Moon phase: 39.98% job: 2587359

RA center: 219.318 degrees

DEC center: -58.567 degrees

Pixel scale: 0.962 arcsec/pixel

Orientation: 359.954 degrees

Field radius: 0.769 degrees

Data source: Amateur hosting facility

Remote source: ChileScope


The object Dr15 (Drechsler 15) is most probably a very old, developed planetary nebula that has already interacted with the interstellar medium. This explains its non-circular shape.
Dr15 was discovered by me in December 2018 and is not far from the star Alpha Centauri.
I found the object using the SuperCOSMOS H-alpha Survey (SHS).

Around the PN you can see a spherical shock front filled with very thin OIII gas. Unusual, because there is hardly any OIII gas inside the PN.
The only explanation I have that it could be a PN is that dust in the foreground of the PN scatters the weak OIII signal too much and therefore nothing arrives at the sensor.
This is supported by the fact that there are no blue background stars in the region. All distant stars are yellow, orange to red, which indicates that their light is strongly scattered by dust.

There is also the possibility that this could be a supernova remnant. X-ray or radio data could be revealing.



Marcel Drechsler
License: Attribution-NoDerivs Creative Commons



Shock front visible in H-alpha.


Distribution of OIII gas.

Sky plot

Sky plot


NEW DISCOVERY: Dr15 (Drechsler 15) in Centaurus, 


            Marcel Drechsler