October 23, 2019

VV 731

2019-10-23, Cherry Springs, sky 21.1 mag/arcsec2 (strong diffuse aurora, Kp=7), seeing 2-4 arcsec. D=508 mm, F=2000 mm, oculars 13, 8, 5.5, 3.5 mm. VV 731 = NGC 7592, Aqr. Reobservation, previously seen as part of the Herschel 2500 survey.

NGC 7592, SDSS

Visible in 28 mm. Observed at 150-570x. Bright star NE, triangle of faint stars SW. Long tail to the S visible in 13 and 8 mm and consists of two segments. Very long, detached. Star embedded in its distal segment. Curves outward CCW. Stubby tail opposite (running S [should be N] from W side of the double core).

In 8 mm, the cores are arranged like a comma with the inner tail pointing NE running from the W core, and the E core appears elongated EW. The E core is broad and enhanced along the NE edge. This is seen better in 5.5 and 3.5 mm.

In 3.5 mm, a starlike (but always diffuse in the poor seeing) knot is resolved S of the midpoint between the cores. Sketch