PaHa1 is a possible planetary nebula or ISM nebula in the constellation Virgo. It's incredibly faint and it does not stand out very brightly in the image above. The red Ha emission data was barely above the background noise. The data was processed in such a way to make it stand out a bit above the background but not by much. 18.6 hours of HII data was collected through a Astrodon 5nm Ha filter over the course of a year,  along with several hours of RGB data for background galaxies and star color. I also collected 27 hrs of OIII data through a Chroma 5nm OIII filter but unfortunately no signal, was so ever, was seen in OIII so its not included in the images.  

The following info about PaHa1 is my summary of information that was graciously provided by amateur planetary nebula discoverer Dana Patchick.

The history of PaHa1 is interesting. Initially, retired planetary nebula expert Dr David Frew, as part of his doctoral thesis in 2004, explored many hot white dwarf and sub dwarf stars for possible planetary nebula. The list of white dwarfs and sub dwarfs was constructed from available literature at the time. Using data from SHASSA (Southern H-Alpha Sky Survey) and VTSS (Virginia Tech Spectral Line Survey), FITS images were examined around these stars and any HII regions were noted. The star in question here was EC 1320-1933 a mag 14.48 star in Virgo at RA 13 31 46.3 and DEC -19 48 25.7. This star also goes by the designation PN G 315.7 +42.0 in the HASH planetary nebula data base. The star was initially listed as a possible detection in Dr Frew's data. Interestingly the spectral type of this star was unknown at the time. As can be seen in the full res version of the annotated image, this star is blue, typical of hot white dwarfs. According to Dana Patchick, the modern take on this star is that it's a He-sdO subdwarf (Helium rich hot subdwarf) and was discovered in 1997. It's had several spectral designations, one being He-sdB (Helium rich subdwarf of spectral type B). This object was initially listed as a possible ISM nebula but in 2017 Dana Patchick collaborated with Paul Haese to image this area (Ha image below) and eventually the designation in the HASH data base was updated to designate the object as PaHa1 and a possible planetary nebula. 

So the jury is still out as to what this object really is. Seven years after its second discovery by Dana Patchick and Paul Haese, here is a color image of this object.   According to Dana Patchick, it's looking more as if the object is probably a background ISM nebula. One thing is for sure, this object is incredibly faint.


Full res crop surrounding just PaHa1


Crop of an annotated image showing the blue hot white dwarf star EC 13290-1933


Paul Haese 2017 Ha image of the faint nebulosity near star EC 13290-1933


My continuum subtracted Ha image of 18.6hrs exposure time.