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NGC 1866
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NGC 1866 (also ESO 85-SC52) is a magnitude +9.7 open cluster in the Large Magellanic Cloud located in the constellation Dorado.

The cluster was discovered by Scottish astronomer James Dunlop using a homemade 9-foot 22.86 cm (9 inch) f/12 speculum Newtonian reflector at Paramatta, New South Wales, Australia, on the 3rd August 1826.

Right Ascension 05h 13m 39.1s, Declination -69 27' 56"



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Title: CORS Baade-Wesselink distance to the LMC NGC 1866 blue populous cluster
Authors: R. Molinaro, V. Ripepi, M. Marconi, I. Musella, E. Brocato, A. Mucciarelli, P. B. Stetson, J. Storm, A. R. Walker

We used Optical, Near Infrared photometry and radial velocity data for a sample of 11 Cepheids belonging to the young LMC blue populous cluster NGC 1866 to estimate their radii and distances on the basis of the CORS Baade-Wesselink method. This technique, based on an accurate calibration of the surface brightness as a function of (U-B), (V-K) colours, allows us to estimate, simultaneously, the linear radius and the angular diameter of Cepheid variables, and consequently to derive their distance. A rigorous error estimate on radius and distances was derived by using Monte Carlo simulations. Our analysis gives a distance modulus for NGC 1866 of 18.510.03 mag, which is in agreement with several independent results.

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