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Pegasus Astro NYX-101 Harmonic Gear Mount
Pegasus Astro NYX-101 Harmonic Gear Mount

Pegasus Astro NYX-101 Harmonic Gear Mount

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Pegasus Astro

Pegasus Astro NYX-101 Harmonic Gear Mount

NYX-101 Harmonic Gear Mount with Harmonic Gear Drive on both axis

Nyx, the ancient Greek goddess of the night, enlightened us to design and produce a high-performing, high payload mount that can easily carry imaging equipment up to 20 kg without needing a counterweight or shaft.

Strain wave drive on RA and DEC movement ensures a backlash-free operation with high torque at high payloads. A fully CNC machined aluminum alloy 6061 body, black and blue anodized, and a selection of branded parts (stepper motors, strain wave gear) inside the mount, ensure that Nyx-101 will perform flawlessly for many years. Mount includes an electronic brake on the RA axis to prevent backsliding when power is off as well as safety limit stops during slew or tracking.


High precision strain wave gears   Supporting high imaging loads
Harmonic Gears on Both Axis ensure high payload and a smooth, backlash-free operation.
A hybrid stepper motor, belt system along with sophisticated electronics can drive RA axis down to 0.10 arcsecs of resolution
Reduction on RA axis is 500:1 and 300:1 on DEC axis.
  Counterweights are not required for weights up to 20Kg.
(counterweights can be installed for higher photographic loads – compatible with M12 shaft)
Lightweight Design                                          Equatorial or Altazimuth Mode
Lightweight Design, based on the weight payload the mount can lift
CNC machined aluminium alloy AL6061 used for aircraft makes the mount an excellent choice for your setup.
Mount weights 6.4 Kg
From a small refractor to a fully loaded SCT 11-inch telescope, NYX-101 can easily handle the payload

Mount can be used as a German Equatorial mount or as an ALT/AZ, more suitable for visual observations

The mode can be switched from our mobile application

Built-in Wireless and USB Control


Power Off Brake

NYX-101 support Wi-Fi out of the box including USB2 connectivity.
Both technologies can work simultaneously.
Mount is compatible with LX200 protocol and Sky Safari for mobile interaction
  A safety power-off brake is Installed on the RA Axis and provides an instant safe stop during a planned or unplanned power interruption.


DC 12 Volts Battery Operation   Secure power and USB   Refraction Corrections
NYX-101 requires 12V only for its smooth operation. This means that you can use your normal 12V battery without any additional converters. Mount consumes less than 0.6Amp during tracking and up to 2.5 Amps during slewing.   The power cable is a GX12 type with can securely lock onto the mount. USB type B special socket ensures a secure grip. Both of these sockets are placed on the non-movable part of the mount. No cables moving during slews and tracking. A 2nd GX12 allows you to provide power to your imaging equipment.   NYX-101 integrates a barometric sensor required to calculate atmospheric, refraction corrections during mount tracking. For smaller focal lengths this is might be overkill but if you have an SCT you will notice a welcome change in your guiding performance.
Universal Saddle Plate   Integrated ST-4 Autoguiding Port   Polemaster Adapter
NYX-101 includes a low profile and rigid universal Saddle that accepts Vixen and Losmandy 3-ich dovetails.   An ST-4 port is available at the back of the mount. Suitable for a simple hand controller or for your ST-4 guiding camera.   In the front of the mount, there is a place for the QHY Polemaster (adapter included), which allows you to perform a precise polar alignment, required for your imaging sessions.


Electronic assistant for initial polar alignment   Reverse Voltage Polarity Protection
A set of sensors allows you to orient the mount at the correct altitude and azimuth in order to have an initial, rough, polar alignment (for lower focal lengths such as camera lenses or visual observations ). Our mobile application guides you through that process.                                          NYX-101 has been designed with reverse voltage polarity protection. A saver if you accidentally reverse battery polarity during the night.
Optional Counterweight support   ASCOM, INDI, Sky Safari Support

Mount does not require counterweights for payload up to 20Kg. However, if you would like to install counterweights for higher payloads there is a compatible M12 threaded shaft hole at the end of the DEC axis.


The mount fully supports ASCOM 6 and INDI framework. Sky Safari is also supported allowing you to control the mount through your mobile device.

LX200 Compatibility   Mobile Control
LX200 protocol is fully compatible with NYX-101   A mobile application for IOS and Android platforms allows you to control both axis of the mount, slew to installed catalogues of thousands of night sky targets and do a rough polar alignment through an electronic polar assistant.
Safety limits on RA axis   Firmware Upgrade
Safety limit encoders on RA Axis prevent internal cable snag or collision with the tripod.   An easy firmware upgrade process allows you to stay up to date with bug fixes and the latest features of the mount.


In the box:

  • NYX-101 Harmonic Geared Mount
  • Power Supply 12V / 5A with GX12 jack
  • Soft Case Carry Bag
  • USB2 Type A to B Cable
  • Azimuth Dowel

Optional Cables

Cigarette Lighter Adapter to GX12 (1.8m)

Use this cable to provide power to NYX-101 by using a battery pack

Adapter 2.5mm x 5.5mm female to GX12 female (30cm/1 ft)

If you own a PEG-PSU-25 you can convert the 2.5mm socket to GX12 and provide power to NYX-101

Power cable 2.1mm Male to GX12 female

If you own a PegasusAstro Powerbox use this cable to provide power to NYX-101 mount


Specifications: Pegasus Astro NYX-101 Harmonic Gear Mount


CNC machined 6061  aircraft aluminum alloy

Mount Mode

Equatorial or Altazimuth

Mount Drive

Strain Wave (Harmonic) Gear and Belt resulting reduction 500:1 (RA) and 300:1 (DEC)

Load Capacity

20 Kg without counterweights
30 Kg with counterweights


6.5 Kg

Safety / Power Off Brake

On RA Axis


Vixen and Losmandy 3-inch

RA Motor Resolution


Max Slew

6 degs/sec

Power Voltage

12V DC unregulated
0.7A during tracking, 2Amps during slewing

Guide Port


Counterweight Shaft

M12 Shaft (1.75mm pitch)


Wireless 802.11g and USB2

Operating Temperature

-20° to + 50°C


3 years

Made in (designed, assembled and tested)

Greece. We carefully curate the entire manufacturing, testing and packing process.

What's in the Box

What's in the Box: Pegasus Astro NYX-101 Harmonic Gear Mount

  • NYX-101 Harmonic Geared Mount
  • Power Supply 12V / 5A with GX12 jack
  • Soft Case Carry Bag
  • USB2 Type A to B Cable
  • Azimuth Dowel
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