1. INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
2. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411007, India
3. Liceo Scientifico ‘Giuseppe Mercalli’, via Andrea d’Isernia 34, I-80122 Napoli, Italy
4. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
5. Physical Research Laboratory, Navrangpura, Ahmadabad 380009, India
6. Tata Institute of Fundamental Research, Mumbai 400005, India