Object name: LBN0477

Designation(s): LBN0477, VDB155D,

LBN 477 is also sometimes known as vdB156d. As such it\'s illuminating star is thought to be Omicron Andromedae about 1.3 degrees to the northwest. It is classified as a reflection nebula. Usually, reflection nebulae are very blue if in front of the illuminating star such that the star\'s light passes through the nebula on the journey to earth. But when the nebula is off to the side or behind the illuminating star as is the case here then it takes on the color of the star itself. In this case, Omicron is a B6pv star so should be very blue yet the nebula is only vaguely blue with areas of strong brown red color. This color is usually attributed to Extended Red Emission caused when certain dust compounds glow when hit with sufficient ultraviolet light. ERE is a very broadband emission rather than bright line emission seen when gas luminesces due to ultraviolet light. What these compounds are exactly is still up for debate. See http://ned.ipac.caltech.edu/level5/March02/Li/Li3_2.html for more on this rather poorly understood subject.

Omicron is about 700 light-years from us. If it is the illuminating star then that is about the distance to the nebula. Likely it is somewhat behind the star for the ERE emission not to be blocked by dust on the side facing the star.

An asteroid appeared on the first night of data collection. It is (264424) 2000 RE. The Minor Planet Center estimates its magnitude that night to be 18.4. It looks a lot dimmer than that but likely the gunk I was imaging through is responsible for that. While a few (less than a dozen) background galaxies are listed at NED none have distance data or even a magnitude so I\'ve not prepared an annotated image. All were from the 2MASS survey and had rather vague positions though with so few in the image that wouldn\'t have hindered identification like it sometimes does.

I hate to be a broken record but I tried for three nights for this one and got clobbered each time. Transparency was poor all nights so I combined as many frames as I could to get this result. Still, red frames were the strongest and blue the weakest due to the scattering by the clouds. I tried to compensate as best I could. Still, I ended up with more ERE in the nebula than I\'ve seen in the very few images of this one on the net. That may indicate a color error from the clouds. It will have to do for now, however. This one is a bit larger than my FOV so I just put in as much as I could of the brightest portion.

14\" LX200R @ f/10, L=8x10\' RG=4x10\' B=3x10\', STL-11000XM, Paramount ME

Alternate Designation(s): LBN0477, VDB155D,