The Calar Alto 3.5m telescope is located in the Sierra de Los Filabres, Spain and is operated by the MPIA Hideleberg. In collaboration with Coryn Bailer-Jones the Torino group began a program to determine parallaxes of L dwarfs in the infra-red using the Omega-Cass instrument. This program began in 2001, was interupted due to maintenence in 2002/2003 and continued until 2005. Current reductions have evsidenced a large astrometric distortion for which we are using the field of M3 to calibrate. The majority of observations were done in service mode.

M3 field in Js

Telescope and Site Specifications
Longitude = 2.54625 deg, Latitude = 37.2236 deg, Altitude = 2168 m
Primary mirror diameter 3.5m
Focal ratio f/10
Ritchey-Chretien optics

OMEGA-CASS Instrument
Detector model: Rockwell 1024 x 1024 HgCdTe HAWAII array.
Scale 0.2 arcsec/pixel
Field of view 3.4 x 3.4 arcmin
Filter used Js 11300 - 14200 Angstroms

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