The 2011 Periastron Passage of the Be Binary δ Scorpii

@article{Miroshnichenko2013The2P,
  title={The 2011 Periastron Passage of the Be Binary $\delta$ Scorpii},
  author={Anatoly Miroshnichenko and Alexey Pasechnik and N. Manset and Alex C. Carciofi and Th. Rivinius and Stanislav {\vS}tefl and Vasilii V. Gvaramadze and Jos{\'e} Lu{\'i}s Pais Ribeiro and A. Fernando and T. Garrel and Johan H. Knapen and Christian Buil and Bernard Heathcote and Ernst Pollmann and Benjamin Mauclaire and Olivier Thizy and J. C. Martin and S. V. Zharikov and Atsuo T. Okazaki and Thomas L. Gandet and Thomas Eversberg and Niels Reinecke},
  journal={The Astrophysical Journal},
  year={2013},
  volume={766},
  pages={119}
}
We describe the results of the world-wide observing campaign of the highly eccentric Be binary system δ Scorpii 2011 periastron passage which involved professional and amateur astronomers. Our spectroscopic observations provided a precise measurement of the system orbital period at 10.8092 ± 0.0005 yr. Fitting of the Heii 4686 A line radial velocity curve determined the periastron passage time on 2011 July 3, UT 9:20 with a 0.9-day uncertainty. Both these results are in a very good agreement… 

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