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Light curve for X Cancrii?

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While photographing Mars passing close to the Paesepe cluster the other night, I was delighted to spot the carbon red variable star X Cnc in the same 10-second exposure image with my Canon 300D (circled):


Can someone pls tell me where I can find past observation logs for this star? I was keen to understand its light curve variability period and amplitude, as it has now got me somewhat hooked! :D

Edited by Starfleet
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X Cnc is one of a large number of semiregular variables with a small range (the catalogued range is the extreme values, usually fluctuations are much smaller amplitude). I've logged a number of visual observations of this star & found it doesn't do much.

Actually it deserves someone taking an interest in it, doing medium/high resolution photometry which (for a star this bright) can be done with a DSLR, standard lens and undriven tripod.

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Hi Jove,

This is just what I was hoping for, thanks a lot.


I had a look at the estimates for this star going back to JD 2416180 ( around 1910) and it is quite like you say, usually sitting around mag 6.7 with a range of 6.0 to 7.5 (extremes). Interesting... and reasonably well behaved!

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