What you are looking at is an airplane that overflew the observatory while the plate was being taken. The image of the aircraft is out of focus showing a donut shape which is referred to as a bohek [link to www.vistaview360.com]

The coordinates are 6h 8m 55s +22d47m30s Go to

[link to stdatu.stsci.edu]

Input coordinates RA 6 8 55 Dec 22 47 30. Set Height and Width to 60 arcmin. Then click find plates. Then select the POSS-II Red plate data 1997-01-10 and click Extract Image from Selected Plate. You can see multiple images of the wing tip light and the fuselage light.