As Mira (OMI CET) rises in the east and places herself in the evening sky, you may wish to observe two lesser observered variables. In the parallelogram-shaped asterism 2.5 degrees north of Mira, lie R and RS CET. R CET is a Mira which varies from 7.2 to 14 V in 166.24 days and is now fading at 9.1 Vis. RS CET is a questionable SR which varies from 7.9 to 8.6 V with an undetermined period.
In looking at the ASAS data for RS CET however, this SR classification seems doubtful, with most of the observations clustering around 8.4 V. Check out: http://www.astrouw.edu.pl/cgi-asas/asas_variable/022800+0013.3,asas3,0,0,500,0,0 ). Is RS CET constant? It seems so, but their are some outlier observations. RS CET is also listed a G star, not M, C or S which are common for other pulsators. Any comments or ideas? RS CET is problematic at best.
If you observe Mira, give a R CET a look. It is easy to find and this under-observed Mira is worthy of your attention.
Kevin Paxson - PKV