{"id":637,"date":"2022-08-28T18:57:15","date_gmt":"2022-08-28T22:57:15","guid":{"rendered":"https:\/\/www.bu.edu\/pto\/?page_id=637"},"modified":"2025-10-21T06:10:00","modified_gmt":"2025-10-21T10:10:00","slug":"specifications","status":"publish","type":"page","link":"https:\/\/www.bu.edu\/pto\/perkins-telescope-observatory\/specifications\/","title":{"rendered":"Telescope Specifications"},"content":{"rendered":"

\"The<\/p>\n

Current Astronomical Information: http:\/\/rosalind.bu.edu\/pto-status<\/a><\/p>\n

Location:\u00a0 35 05 48.6N 111 32 09.3 W<\/a>
\nAltitude: 7236 ft (2206 m)
\nOptical Design: Cassegrain
\nMount Design: English equatorial
\nPrimary Diameter: 72 in (1.83 m)
\nCentral Obscuration Diameter: 17 in (0.43 m)
\nPrimary Material: Schott Duran-50 low expansion glass
\nPrimary Coating: Aluminum (~1000 Angstroms)
\nPrimary Conic Constant: -1.0 (parabola)
\nPrimary Focal Length: 300.6 in (7.64 m)
\nPrimary F\/#: 4.18
\nSecondary Material: Quartz
\nSecondary Coating: Aluminum (~1000 Angstroms)
\nSecondary Conic Constant: -2.65 (hyperbola)
\nF\/# at Cassegrain Focus: 17.5
\nEffective Focal Length at Native Cassegrain Focus: 1256.5 in (31.92 m)
\nPlate Scale at Native Cassegrain Focus: 6.45 arc seconds\/mm
\nGuiding: Articulated off-axis pick-off mirror and camera<\/p>\n","protected":false},"excerpt":{"rendered":"

Current Astronomical Information: http:\/\/rosalind.bu.edu\/pto-status Location:\u00a0 35 05 48.6N 111 32 09.3 W Altitude: 7236 ft (2206 m) Optical Design: Cassegrain Mount Design: English equatorial Primary Diameter: 72 in (1.83 m) Central Obscuration Diameter: 17 in (0.43 m) Primary Material: Schott Duran-50 low expansion glass Primary Coating: Aluminum (~1000 Angstroms) Primary Conic Constant: -1.0 (parabola) Primary […]<\/p>\n","protected":false},"author":7725,"featured_media":0,"parent":5,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/pages\/637"}],"collection":[{"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/users\/7725"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/comments?post=637"}],"version-history":[{"count":16,"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/pages\/637\/revisions"}],"predecessor-version":[{"id":986,"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/pages\/637\/revisions\/986"}],"up":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/pages\/5"}],"wp:attachment":[{"href":"https:\/\/www.bu.edu\/pto\/wp-json\/wp\/v2\/media?parent=637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}