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Delta Scorpii unusual brightening to first magnitude

ATel #8618; Costantino Sigismondi (ICRA, International Center for Relativistic Astrophysics)
on 31 Jan 2016; 06:55 UT
Credential Certification: Costantino Sigismondi (sigismondi@icra.it)

Subjects: Optical, Star, Transient, Variables

Referred to by ATel #: 8619

The Be star delta Scorpii with a range of variability between 2.35 and 1.65 in visible light is having an unusual brightening to magnitude mV=0.8, as measured on 31 Jan 2016 at 3:56 UT and 5:36 UT from Lanciano, Italy. References on this star are on https://www.aavso.org/vsots_delsco and http://arxiv.org/pdf/1112.2356 with light curves up to 2011, and http://arxiv.org/pdf/1410.8492v1.pdf to 2014. Accurate spectro-photometry of this very unusual activity may add useful information on this naked-eye bright variable star.

AAVSO last 5 years light curve of Del Sco: author's data in blue crosses