From Wikipedia:NGC 7331 Group is a visual grouping of galaxies in the
constellationPegasus.
Spiral galaxyNGC 7331 is a foreground galaxy in the same field as the collection, which is also called the
Deer Lick Group.=reference
[1] It contains four other members, affectionately referred to as the "fleas": the
lenticular or unbarred spirals [url=new=https://en.wikipedia.org/w/index.php?title=NGC_7335&action=edit&redlink=1]NGC 7335[/url] and [url=new=https://en.wikipedia.org/w/index.php?title=NGC_7336&action=edit&redlink=1]NGC 7336[/url], the
barred spiral galaxy [url=new=https://en.wikipedia.org/w/index.php?title=NGC_7337&action=edit&redlink=1]NGC 7337[/url] and the
elliptical galaxy NGC 7340. These galaxies lie at distances of approximately 332, 365, 348 and 294 million light years, respectively.=reference
[2] Although adjacent on the sky, this collection is not a
galaxy group, as NGC 7331 itself is not gravitationally associated with the far more distant "fleas"; indeed, even they are separated by far more than the normal distances (~2 Mly) of a galaxy group.
Celestron C11 Dew Heater Artifact:Those with sharp eyes will see spikes in some of the especially brighter stars. Believe it or not this is caused by the Celestron anti-dew heater integrated into the rim of the OTA. Gary Imm saw it first and it is acknowledged by them as it is very hard to evenly heat the large aperture. Eventually I solved the problem by going back to my older dew straps and carefully titrating the heat... I cannot use a dew shield because of limited space in the ROR and because I have an automatic aperture cover.
One of a couple articles on this on Cloudy Nights. 
Comments