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Norman Lockyer Observatory.

Zeta Auriga 2019 Eclipse

in Spectroscopy Section Sun Dec 02, 2018 5:29 pm
by revandBellman • 5.191 Posts

Conditions in 2019 will be favourable for observing this eclipse.

Zeta Aurigae is a well known eclipsing binary which has a period of 972 days. The eclipse lasts about 37 days and is somewhat unusual because a small very hot blue star passes behind a supergiant red star. Ingress and egress last about 1.5 days. There are no sharp boundaries to the eclipse as the smaller star continues to shine, during ingress and egress, through the tenuous outer atmosphere of the larger star.
The midpoint of the 2019 eclipse is scheduled for 13th November 2019 which means that ingress will be around 25th October and egress around 2nd December. Out of eclipse magnitude has been found to be 3.75V. The eclipse magnitude is 3.99V.
There are differing views of the depth of the eclipse. GCVS states it to be 0.27V and Krakow 0.6V. In the 2009 eclipse the depth was found to be 0.15V. In 2017 the depth was found to be 0.22V.
The eclipse is a good target for DSLR photometry. V magnitude measurements are required. The transformation correction changes during the eclipse because we are only observing the primary red star rather than the combined light of the two stars in the system.

NEQ6 mount, C6 telescope with skywatcher guide scope for moving around with Starlight SXVR H9 main camera and SX auto guider.
Celestron C9.25 and WOZ 72 in dome with atik 460 camera and a Co-star for guiding with alpy for spectroscopy.
MCT5 with SE mount and SXVR MX 916 camera and star analyser for spectroscopy
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