Abell 28 (PK 158+37.1) in Ursa Major

Abell 28 (PK 158+37.1) is a 13.5 mag plan­et­ary neb­ula in the con­stel­la­tion Ursa Major with very low sur­face bright­ness and a dia­met­er of about 5.5 arcmin. The bright­ness seems to be uneven dis­trib­uted over the disk. The PN has a rather bright rim in the SE, while it is get­ting dim­mer to the NW. The blue cent­ral star ( 17.4 mag) is quite out of the center.

To reveal the PN, about 25h of Ha data have been sampled which have been used as lumin­ance. The response in OIII was very poor, thats why only Ha was cap­tured. North is up in this image.


RCOS 14.5″ f/​8
Apo­gee U16M
Astro­don Gen2
HaR­GB 1480:160:160:160 min.
ROSA Remote Obser­vat­or­ies South­ern Alps
© Mar­tin Ruster­holz, Astrophotographer

Find­er Chart Abell 28 in Ursa Major

LBN 380 Region Sky Chart - Astrophotography Martin Rusterholz

Image cre­ated by Skychart

About Me

Hello, my name is Martin Rusterholz. I’m a Swiss amateur astrophotographer living near Zurich, the biggest town in Switzerland. My interest in astronomy started when I was 16. At that time, I built my first Newtonian telescope and mount. I studied physics at the Swiss Federal Institute of Technology (ETH) which was the only study including at least some aspects of astronomy and astrophysics. “Looking at the nights sky is an experience touching everybody deeply inside, something common to all human beings independent to the language spoken by the individuals”. Deep-sky astrophotography is my passion.