Electronic Telegram No. 4255 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network METEOROID ORBIT DATABASE L. Neslusan, Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, reports with P. Jenniskens, V. Porubcan, and J. Svoren that they have expanded the database managed by the IAU Meteor Data Center. The meteoroid orbits measured by the Cameras for All-sky Meteor Surveillance (CAMS) in 2010-2013 are now available, together with a re-formatted meteoroid orbit catalogue from photographic observations. In total, the IAU MDC database now contains records derived from 4873 photographic and 110521 video meteor observations. The data are publicly available and can be downloaded at website URL http://www.astro.amu.edu.pl/~jopek/MDC2007/index.php. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2016 CBAT 2016 February 13 (CBET 4255) Daniel W. E. Green