TW Cassiopeiae / TW Cas

Light curve and phase diagram of the EA type eclipsing binary TW Cassiopeiae / TW Cas.  This was constructed from photometry of 30 images taken by the Bradford Robotic Telescope Cluster Camera (BRT) between 12 October 2014 and 1 October 2016.

The following phase diagram was constructed from these observations.
​

The period of 1.428361 d was the best fit to this data, which compares well with 1.428324 d from the AAVSO VSX and 1.428334 d from Kreiner.

---

On November 28 2016 I obtained the following light curve using the 2" refractor at Somerby Observatory.  (The fade was missed due to cloud.)
​

​The time of minimum obtained from this eclipse was
​HJD 2457721.3891.

---

---

A secondary minimum was observed from Somerby on 28 December 2017.

---

Combining the BRT and Somerby data, after adjusting the zero point of the BRT data 'by eye' to better fit the ccd data (by -0.03 mag), produced the following light curve and phase diagram.  I intend to observe a complete primary eclipse in the near future!
​

---

1999 visual observation, using 15x80 binoculars.

---

Combining visual (red) and ccd (black) observations.  Here, the visual magnitudes were adjusted 'by eye' (by -0.174 mag) to better fit the ccd results.

---

Comining BRT (black) ccd (red) and visual (blue) observations;

​[Page updated 3 January 2018]