Equinox Systems GEMINI Manuel d'utilisateur télécharger pdf (Page 9)

Gemini Users Manual 4

the setup menu. When a GoTo operation occurs, the telescope moves at GoTo Speed,

and then slows down to Centering Speed as it approaches its target. Telescope parking is

a separate command that disables tracking and moves the mount to a predetermined

Home position – by default, counterweight down with the telescope pointing to Celestial

North. Finally, all telescope movement stops and an alarm sounds when the mount slews

to either its Eastern or Western safety limit. A warning also sounds when the mount

approaches its Western limit while tracking.

Databases of many well-known celestial objects are permanently stored in the Gemini.

These are arranged in eleven descriptive lists and/or astronomical catalogs. The RA and

Dec. coordinates in these databases are standardized to epoch J2000.0, and are precessed

to the equinox of the day; consequently, once the mount and Gemini are properly aligned,

the user can accurately slew to any of these objects. In addition to the permanent

databases, Gemini also contains a customizable (user-defined) database where the user

can conveniently input and store the names and coordinates of his or her most often-

observed celestial objects. This list can be retained or erased at will. Finally, Gemini

allows the user to set and return the telescope to marked coordinates called Bookmarks.

(d) Displaying Date, Time, Pointing Coordinates, and Object

If the mount and Gemini are star-aligned, Gemini is able to provide the user with an

accurate RA/Dec and Az/El coordinate readout of any position to which the mount is

pointing, and is also able to identify (within a level of probability), the most likely

celestial object in the field of view, filtered by type of object and magnitude. It can also

show the current date and time in UTC, Civil Time, Julian Date, and Local Sidereal

Time.

(e) Object Search

Sometimes the user knows the approximate position of a celestial object, but the object is

not in the field of view. Gemini can search for the object in two ways: (1) by starting at a

known coordinate and scanning in an outward pattern limited to a 5 arc minute to 2

degree FOV, and (2) by moving in a "Z" shape, 5 arc minutes per axis, to help recognize

faint objects.

(f) PC Control

Gemini can be controlled by a remote computer via an RS232C serial cable. Such

control is most often accomplished with planetarium software using the LX200 protocol,

the ASCOM standard or with the Gemini Control Center program available online from

Daniel Görlich at http://www.DocGoerlich.com/GCC. The serial command set

description allows the development of custom software. In addition, Gemini's Feature and

Encoder Ports can be used to control user-designed hardware.

(g) QuickMenu

This menu duplicates functions found elsewhere in the menu tree, but is convenient to (1)

quickly change Gemini's Centering Speed incrementally from 2X to 128X, (2) quickly

change Hand Controller Mode to either Visual or Photo, (3) quickly park the mount in the

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Equinox Systems GEMINI Manuel d'utilisateur Page 9