The motors are directly mounted on the axes, with no additional connecting-parts or speed-reduction components. The very high torque of the selected motors ensures high axis rigidity, and makes possible the use of an unbalanced telescope.
The parking brake is automatically activated every time the mount is powered down, making it ready at power-up without resetting encoders.
The motors are driven by very-high-resolution encoders with 26 milliseconds of arc by step, providing more than 48 millions steps per revolution, ensuring very high slewing and tracking precision.
Actual position in right ascension of a star measured 3.75 times per second for 15 min. Star located on the celestial equator (0 ° declination). Res. of 0.39 arcsec per pixel. Without autoguiding, only turbulence is visible.
Unlike an old technology geared mount, even one with high resolution encoders, the performance of direct-drive motors enable a feedback loop at high frequency that is extremely responsive. The dynamics of this kind of motors guarantees the performance of the mount matches the precision of the encoder.
But you can forget about the technology and concentrate on the performance. You can use the SkyVision ”Nova” mount the same way you do with any standard German mount without having any of the inherent flaws:
- High-precision monitoring permits long exposures without guiding
- The high slewing-speed of the mount permits very rapid pointing, giving significant time gains for temporary phenomena such as gamma ray bursts.
- No need for control gears or tangent screws.
- A very high rigidity at any temperature due to the zero backlash and hysteresis.
- No wearing parts ensuring high reliability.
- Tracking of moving objects from the sky (sun, moon, planet, comet, asteroid, earth artificial satellites…).
Thanks to the monitoring quality of the “Nova” mount, none of your shooting-session pictures will be wasted. You will spend more time actually observing and imaging, and less time fighting with the hardware.
Size and carrying capacity of this mount makes it ideal for instruments in the 400 to 600mm aperture range (Nova 120) and above (Nova 200), depending on the weight and length of the optical tube. The upper interface of the mount includes many threads for easy attachment of a variety of instrumentation. This interface can easily be adapted to custom instrumentation if needed.
For both portable and fixed usage, an optional oversized pier is available for rigid and steady positioning of the mount. Jacks allow precise levelling adjustments on uneven ground.
A Robotic Mount
As not everyone has a perfect sky in his own garden, the SkyVision “Nova” mount has been designed for remote use from the very beginning. Hollow shafts (free passages of 66mm diameter) mean every cable can pass through the mount, ensuring the telescope points in any direction without the risk of a snag.
If the telescope position is somehow lost, such as due to a power failure, the encoders include markers permitting resets with limited-area exploration (around 10–15 °).
The mount includes an Ethernet interface, which provides network reliability and connection capabilities. The mount operating software supports both standalone and ASCOM-protocol-controlled modes, making the mount easy to control using any mount-driving software. This operating software has been designed to combine both high performance and user-friendliness, and is available either in French and English.
« Nova 120 »
« Nova 200 »
|Weight without counterweight:||
|External dimensions (mm):||
120 kg (260 lb)
200 kg (440 lb)
|Slewing speed* :||
up to 20°/s
|Absolute pointing accuracy** :||
5 Arcsec RMS
|Unguided drive accuracy up to 10min duration**:||
0.3 Arcsec RMS
|Unguided drive accuracy up to 30min duration**:||
1 Arcsec RMS
0° to 66°
115VAC / 230VAC / 24VDC (10A)
Windows xp to 8, Ethernet port, USB port…
|* depends on the payload mass ** After establishing a pointing and speed model, and depending on the stiffness of the optical tube|
Optional parts :
- Additional 10 kg counterweight
- Oversized Pier ( “Nova 120″ / “Nova 200″)
- Indexed levers for polar alignment without tools
- Polar finder
- Carrying container with wheels
|We have set up a remote telescope setup that is made of a NOVA 120 directdrive mount with OTN 400 from Skyvision, OPTEC 3″, ATIK 383L+ATIK filter Wheel, ASTRONOMIX filter set.There is no guiding camera since this is a direct drive mount, and we are performing remotely exposure from 300s to 600s seeing dependent.Acquisition and processing software is PRISM V9, using automatic observations mode (I was sleeping while the images were recorded)|