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.

Details

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Author:
RCOS 14.5″ f/​8
ASA DDM85
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