Free Access

This article has an erratum: [https://doi.org/10.1051/0004-6361/201629551e]


Table 1

Telescopes and instruments used.

Telescope Observatory Instrument Aperture Nights

Perkins Lowell observatory Prism 1.8 m 47
Hall Lowell observatory Nasa42 1.1 m 46
31 inch Lowell observatory Nasa31 0.7 m 16
IAC-80 Teide observatory Camelot 0.8 m 3

Total: 112

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.