FV CVn (EW type eclipsing binary)

[coatesg]

Managed to have a good 5 hour or so run on FV CVn last night - runs like this are going to become more inconvenient as the clocks change tonight and it gets darker later! Have an issue with tracking on the mount, which doesn't affect variable work so much, but there's an odd jump here or there in tracking - it may well be a balance issue (I'd tried to improve it and clearly made it worse!) - gladly for variables, it's not so critical as for astroimaging!

Minimum measured as JD 2458936.4752 +/- 0.0001. (HJD = 2458936.4796)

(All images were 60s, 350mm Newtonian, f4.6, ST2000XM, V filter)

Edited March 28, 2020 by coatesg

[coatesg]

Based on the ephemeris "2452500.248  + E x 0.3153620" from the Krakow database (J.M. Kreiner, 2004, Acta Astronomica, vol. 54, pp 207-210.), the predicted minimum for epoch 20409 is: HJD 2458936.47106 - so looks like: O-C=+0.0085 - appears to be a bit anomalous compared to this O-C plot...:

 

(EDIT; but appears to fit right in with Bob Nelson's OC data - no idea what's wrong here!) 

  

Edited March 28, 2020 by coatesg