Object name: BARNARD105
Designation(s): BARNARD105, PK026, 02.1,
Barnard 105/LDN 506 is a small, dark nebula less than one minute of arc across located one degree southwest of M 11 in Scutum. I find virtually nothing on it. A general estimate of the typical distance to Scutum dark nebula is about 650 light-years. I have no idea if that is accurate in this case. The bright star on the southwest edge is BD -7 4710 a 9th magnitude star. To the west (right) of Barnard 105 is the very small, 7 second of arc, blue planetary nebula PK 026-02.1 (Pe 1-16). A 1984 paper puts its distance at 1,200 parsecs (3,900 light-years) http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1984A%26AS...55..253M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf . I couldn't find a more recent distance estimate. It seems to contain two white stars neither at the center. They likely mask the true central star. I hadn't realized it was in the frame until I processed the image and wondered why that blue "star" was a blob far larger than it should have been. A check of SIMBAD turned up it was a planetary nebula.