The GM2000HPS mount, now in the new M2 version, is built for the demanding observer
using photographic instruments up to a weight of 60kg 130 lbs (counterweights not
Movements are driven by two AC servo motors, with timing belt reduction having zerobacklash.
Both axes feature a classic worm wormwheel pairing. The wormwheels are made of bronze (B14), with a diameter of 172mm and 215 teeth, while the worms are made of alloy steel with a diameter of 24mm. The axes themselves are made of 50mm diameter alloy steel, for the maximum rigidity.
The electronics are housed in an independent control box, easily removable. The connections of the mount and keypad feature secutiry lock screws.
The mount can be controlled using the included
keypad, without connecting an external PC. The
keypad is built in order to maintain the maximum
readability in all lighting conditions. Both the display and the ergonomic keys, allowing for the use of gloves, feature a red backlight. An heater keeps the display warm for usage below freezing temperatures.
The mount can be controlled using the most common software packages by connecting it to a PC with the RS-232 serial port or the Ethernet connection, via the 10micron ASCOM driver or the Meade compatible command protocol. Furthermore, a dedicated software (also included with the mount) can be used to create a "virtual keypad" replicating exactly the functions of the physical keypad. The RS-232 port can also be used to control an external dome. This flexibility makes the GM2000HPS an ideal mount for observatories and remotized observing sites.
The object database contains many star catalogs and deep-sky objects up to the 16th magnitude. Solar system objects can be tracked so that their motion is compensated with respect to the stars. You may load orbital elements of comets, asteroids and artificial satellites into the mount, so that these objects can be tracked directly using the keypad (without any external PC).
Pointing is made accurate through the usage of a model containing up to 100 stars, which
allows for the correction of the classical polar alignment and conic errors, and also of the most important flexure terms of the optical tube. In this way it is possible to obtain pointing accuracies of the order of 20 arcseconds
RMS. The same model can be used in order to
obtain the maximum tracking accuracy,
compensating also for the atmospheric refraction
(depending on the local atmospheric pressure and
temperature). A series of auxiliary functions is
provided to help the user for quick aligning the
mount to the celestial pole. You may also save and recover the alignment data of different observing sessions. This function is very useful if you have many instruments in different setups, each one requiring different flexure corrections.
Tracking through the meridian, a typical problem
with german mounts, is solved allowing for tracking for up to 30° past the meridian
(configurable), in both directions. In this way any object can be tracked for at least four
The tracking accuracy makes autoguiding
not necessary for many uses. The absolute encoders on both axes allows to obtain a
typical tracking error below 1 arcsecond. It
is possible to autoguide anyway, using the ST4-compatible port or through the serial/Ethernet connection, with a guide rate configurable from 0.1x to 1x. The guide rate can be automatically corrected for the declination of the target, so that there is no need of recalibrating the autoguide when different declinations.
Among the other functions, you will find the
electronically-assisted balance and the ability of parking the mount in different user-defined positions.
Designed for field use, the ultraportable version is easily divided into two parts. All
electrical connections are made automatically when assembling the mount. The biggest
piece has a weight of only 15 kg 33 lbs, and in combination with the Centaurus II (21 kg
46 lbs) you obtain a winning combination for the mobile observer.
TECHNICAL DATA SHEET
Type German Equatorial Mount
Weight (mount) 30 kg 66 lbs without accessories
Weight, Ultraportable version (mount) 15 kg 33 lbs + 15 kg 33 lbs without accessories
Instrument payload capacity 60 kg 132 lbs
Latitude range 20° 70°
Azimuth fine adjustment range +/− 10°
Counterweight shaft 40 mm diameter, stainless steel, weight 4 kg 9 lbs
Axes 50 mm diameter, alloy steel
Bearings Pre-loaded tapered roller bearing
Worm wheels 215 teeth, 172 mm diameter, B14 bronze
Worms diameter 24mm, tempered alloy steel, grinded and lapped
Transmission system Backlash-free system with timing belt and automatic
Motors 2 axes AC servo brushless
Power supply 24 V DC
~ 0,7 A while tracking
~ 3 A at maximum speed
~ 5 A peak
Go-to speed Adjustable from 2°/s to 20°/s
Pointing accuracy < 20 with internal multiple-stars software mapping
Average tracking accuracy
< +/− 1" typical for 15 minutes (< 0.7" RMS)
with internal multiple-stars software mapping and
compensation of flexure and polar alignment errors
Security stop +/− 30° past meridian in r.a. (software)
+/− 45° past meridian in r.a. (mechanical)
Communication ports RS232 port; GPS port; autoguide ST-4 protocol port;
Stars: by name, Bayer designation, Flamsteed designation,
Bright Star Catalogue, SAO, HIP, HD, PPM, ADS, GCVS.
Deep-sky: M, NGC, IC, PGC ,UGC limited up to mV = 16.
Solar system: Sun, Moon, planets, asteroids, comets,
artificial satellites. Equatorial and altazimuth coordinates.
User defined objects, fast slewing positions.
User defined mount parking position, 2-stars and 3-stars
alignment function, up to 100 alignment stars for
modeling, correction of polar alignment and orthogonality
errors, estimate of average pointing error, storage of
multiple pointing models, sidereal, solar and lunar tracking
speed adjustable on both axes, declination-based
autoguide speed correction, adjustable horizon height
limit, pointing and tracking past meridian,, assisted
balance adjustment, manual or GPS based time and
coordinates setting, dome control via RS-232, configurable
atmospheric refraction, network settings, comets and
asteroids filter, multi-language interface. Remote Assist via
Remote control via RS-232 or Ethernet; proprietary
ASCOM driver or Meade compatible protocol; update of
firmware and orbital elements of comets, asteroids and
artificial satellites via RS-232 or Ethernet; virtual control
panel via RS-232 or Ethernet. Optional Wi-Fi.
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