WR 102

Constellation: Sagittarius

WR 102 is a variable Wolf-Rayet star in the constellation of Sagittarius. WR 102 is surrounded by a bubble nebula blown by the intense radiation and fast wind from the star.
WR 102 an extremely rare star on the WO oxygen sequence. It is a luminous, very hot star and highly evolved and close to exploding as a supernova. It surface temperature is around 210’000 °K and is between 282’000 and 380’000 more luminous than the Sun. It is located 7’500 Ly from Earth.

Dates:

This is derived from the outstanding data taken by Martin Pugh during the months of August and September 2023 (Martin’s website: Remote Astrophotography with Martin Pugh (martinpughastrophotography.space).

His telescope is located in Chile (Observatory: El Sauce).

Colour palette is HOO.

Telescope & Mount:

Planewave CDK24 (F6.5) on a Planewave L600 mount.

Imaging:

Camera: Moravian G3-61000 (bin 2×2)

Data:
Nebula:
Astrodon Ha: 16x1200s
Astrodon O3: 18x1200s

Stars:
Astrodon R: 10x180s
Astrodon G: 10x180s
Astrodon B: 10x180s

Total integration time: 12h 50′

WR 102 in its broader context. This region contains Sh2-22 (the HII region to the northwest), Barnard 78 (LDN 42, the dark nebula to the south), and Sh2-17 (the HII region to the east).
The image is based on data from Telescope Live (Takahashi FSQ-106ED with a FLI PL16803 camera): Ha-Oiii-Sii 33x600s each.