| The ZTA-2.6 telescope is the largest observational instrument of BAO. The telescope is located near vil. Byurakan at the altitude of 1406 m above sea-level. The coordinates of the site are longitude +44°16'29", latitude +40°20'29". |
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| Main mirror diameter | 260 cm |
| Mirror weight | 4 tons |
| Mirror material | Sitall |
| Mounting | Equatorial |
| Aperture ratio (D/F) | 1:3.85 |
Primary focus |
| Focal length | 10 m |
| Field | 2' |
Cassegrain focus |
| Focal length | 40 m |
| Field | 4' |
3 Namysh foci |
| Focal length | 40 m |
| Field | 12' |
Coudé focus |
| Focal length | 105.4 m |
| Field | 1'40" |
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The telescope was constructed at the LOMO (Leningrad Optical-Mechanical Association, Sent-Petersburg, Russia) and actually represents the twin of the G.A.Shain reflector mounted at the CrAO. Both these reflectors, as well as the 6m telescope of the Russian Special Astrophysical Observatory (SAO) have been designed by Bagrat Ioanissian – the LOMO General constructor. ZTA-2.6 was installed in 1975 and is in operation since 1976. |
