CBA Concord
Long. 122W Lat +38
| Lew Cook operates CBA Concord from the San Francisco suburb of Concord, approximately 30 miles (50 km) East of the City. One of the 2 telescopes formerly at CBA Concord is now in use in Pahala, Hawaii at CBA Pahala The remaining telescope is a 73 cm reflector operated at prime focus on an english cradle mount. It uses a Genesis G16 camera for collection of CCD images. These are reduced using Richard Berry and Jim Burnell's AIP4WIN. |  |
 Lew's CCD Camera Project Contains some collected CBA light curves. | The web page linked on the left panel describes the construction of the original Cookbook camera and re-work of the 44 cm telescope. The re-build of the second (73 cm) telescope on an English style cradle mount, modified for steel lattice structure and scaled up from the 50 cm reflector of E. C. Silva, shown on Pedro Re's web pages, was completed. It operates at prime focus. Construction will began in the fall of 1999 and was finally put into routine operation in the spring of 2003. |
| Despite being near sea level, in a suburban location, and near famous foggy San Francisco, Concord provides abundant clear skies for astronomy, especially in the summer and fall. Climatically, Concord is considerably different from San Francisco, being on the eastern side of the Berkeley Hills which stop much of the fog from reaching inland. To the south about 50 miles (80 km) is the Lick Observatory of the University of California. A example of data collected for the CBA effort on V603 Aquilae is presented below. | |
One of the first stars observed using the CCD camera was V603 Aql. V603 light variation on July 18, 1999 and July 1, 2003. | |
| When this star was observed again in 2003, periodic humps were found at a period of 0.1454 day (3.48 hours). The data from 70 hours of observation on 11 consecutive nights (June 21-July 1, 2003) was averaged over this period giving the following "Superhump" profile. The data is repeated over 2 cycles for clarity. |  |
 CBA Home Page |  Just for fun - Lew's 1998 Solar Eclipse Pix |
 Copyright 2000 Elaine Mills Lew's Home Page |
| Lew's Hawaiian site - CBA Pahala where the 17 inch Newtonian resides | Please contact me about my work for CBA if you have questions. | This page was last updated on July 1, 2003 |