Abell 43 (PK36+17.1) is a planetary nebula in OPH located at RA 17hr 53m 32s  and DEC +17d 53m 24s. It has a special type of central, pulsating star that is the subject of considerable research. PG 1159 stars are hydrogen-deficient post ABG-stars on their way to the white dwarf cooling sequence. However, a fraction of them shows small amounts of atmospheric hydrogen, and are referred to as hybrid PG 1159 stars, which is the case here. The above cropped image is 13' x 13' and north is up. Both types may be at the center of planetary nebula. where a nebula surrounds the star. A similar hybrid PG 1159 star exists in NGC 7094 (see my image here).    It is particularly interesting that the nebular structure is similar in both Abell 43 and NGC 7094 with interlacing filaments. A side-by-side comparison is shown below.

             ABell 43  (PK36+17.1)                                                 NGC 7094 

Astrodon 3nm OIII and H-a filters were used to bring out detail in the nebula and Astrodon Generation 2 RGB filters were used for star colors.  The system was guided with an SBIG ST-402 camera on an Astrodon MonsterMOAG off-axis guider.  Data were collected automatically using CCDAutoPilot4 running MaximDL4.62 for camera operation and PinPointPro for plate solving.  Data were calibrated, registered and initially processed in CCDStack2. Final processing was done in Photoshop CS5 Extended and PixInsight.