Possible Planetary Nebula Hu 9
Published 27 July 2025
Hu 9 full field of view
Crop showing the location of the possible central star which is a hot sub dwarf candidate
Annotated image of Hu 9
About this object
Huet 9 (Hu9), is a possible planetary nebula in the constellation Cygnus. It was discovered by French amateur Laurent Huet in August 2019. Hu 9 is rather faint but large at 18 arc minutes in size. It sits within a rich field of H𝛼 emission. Near the center of Hu 9 is a hot sub dwarf candidate GAIA DR3 1863765122127194624 at magnitude 15.8. Hu 9 can be found at RA 20 29 35.35 and DEC +33 07 32.0.
I started this image while at the Okie Tex Star Party in October 2024 and was able to finish the exposures from home in July 2025. Total exposure time was 55.93 hrs.
Huet 9 (Hu9), is a possible planetary nebula in the constellation Cygnus. It was discovered by French amateur Laurent Huet in August 2019. Hu 9 is rather faint but large at 18 arc minutes in size. It sits within a rich field of H𝛼 emission. Near the center of Hu 9 is a hot sub dwarf candidate GAIA DR3 1863765122127194624 at magnitude 15.8. Hu 9 can be found at RA 20 29 35.35 and DEC +33 07 32.0.
I started this image while at the Okie Tex Star Party in October 2024 and was able to finish the exposures from home in July 2025. Total exposure time was 55.93 hrs.
Image Details
- Optics : Stellarvue SVX 152T refractor @f8 1200mm FL
- Mount: Paramount MYT
- Camera: ZWO ASI6200
- Filters: Chroma 50mm RGBOIII, Astrodon 50mm Ha
- Exposure (min): RGBHaOIII 116:120:120:1740:1260 Total of 55.93 hrs
- Automation Control: The Sky X, Voyager, PrimaluceLab Eagle
- Guiding: ZWO ASI 174 mm mini
- Processing Software: PixInsight
- Location: Stark Bayou Observatory, Ocean Springs, MS and Okie Tex Star Party, Kenton OK
- Sky: Home: Typical SQM 19.6-20.1, Bortle 5, Suburban, Okie Tex: Bortle 1
- Date: 11 Oct 24 - 6 July 25
