🛰️ Nebula Explorer 20 Astro Hub (NBX‑20 Astro Hub)
Premium Harmonic Drive Equatorial Mount Head
Designed by astrophotographers. Engineered for precision.
🧭 Overview
The Nebula Explorer 20 Astro Hub, also known as NBX‑20 Astro Hub, is a professional-grade equatorial mount head designed for demanding astrophotography applications. Built around a robust 100:1 harmonic drive, this mount delivers exceptional tracking accuracy, ultra-low backlash, and unmatched structural rigidity in a compact, lightweight form factor.
With its modular architecture, weather-tested durability, and support for fully autonomous setups, the NBX‑20 Astro Hub is ideal for both field astrophotographers and remote observatories.
✅ 100:1 Harmonic Drive
Ultra-high-precision, zero-backlash drive system delivering 10–31 Nm rated torque (ZXS-17 series).
✅ Precision Stepper Motors
High-accuracy, high-torque NEMA 17 stepper motors engineered for smooth microstepping control.
✅ High Payload Capacity
13 kg without counterweight and up to 22 kg with counterweight (successfully tested with 30% overload).
✅ Dual Bearing Support
Additional large-diameter ball bearings increase tracking accuracy and reduce long-term wear on the harmonic drive.
✅ Astro-Optimized Tracking
Supports long-exposure guiding with RMS performance as low as 0.5–0.7 arcsec, validated using 8″ f/4 Newtonians with off-axis guiding.
✅ Rigid CNC & CF Construction
A structural blend of CNC-machined aluminum and carbon-fiber-reinforced PA12 (PA12+CF15), engineered to minimize flex under lateral loads and wind gusts.
✅ Extreme Environmental Reliability
Tested from –10°C to +30°C (including high humidity). Maintains mechanical stability and guiding precision in demanding conditions.
✅ Counterweight-Free Operation (Optional)
Optimized balance for compact OTAs and fast focal ratios. Optional hybrid wedge available.
✅ Modular & Expandable Architecture
Built-in ports for dual focusers, dew-heater outputs, real-time clock, integrated weather station (temperature, pressure, humidity, dew point), and full compatibility with the OnStep control system.
✅ Accessory-Ready Design
Integrated mounting points for cable management and accessory attachment (included).
✅ Warranty: 36 Months
The design, which includes additional bearings, reduces the load and wear on the harmonic drive.
📦 Specifications
| Parameter | Value |
|---|---|
| Drive Type | Harmonic Drives: RA ZXS‑17 (100:1) | DEC ZXS-14 (100:1) |
| Max Payload (no counterweight / with counterweight ) | ~13 kg (OTA + accessories) / ~22 kg (OTA + accessories) at 20 cm from RA axis |
| Guide Accuracy (RA/DEC RMS) | 0.4–0.75 arcsec typical |
| Weight (Mount Head Only) | ~4.5 kg (with carbon-fiber casing) |
| Auxiliary Bearing Diameter | RA 90 mm | DEC 75 mm |
| Construction Materials | CF-reinforced PA12, CF Plates, brass inserts, ball bearings |
| Electronics | OnStep controller, dual dew heater drivers, dual focuser ports, weather station, real time clock |
| Operating Temp. Range | –10°C to +30°C |
| Supported Telescopes | Newtonians up to 10″, Refractors <1000 mm FL |
🚀 Why Choose Nebula Explorer 20 Pro Astro Hub?
Whether you’re imaging from a Bortle 9 city center or a dark-sky desert, the NBX‑20 Astro hub gives you mechanical confidence and tracking precision without compromise. Designed from scratch by astrophotographers, it eliminates the usual weaknesses of commercial mounts: flex, backlash, and overcomplicated mechanics.
🛠️ Engineered & Made in Poland 🇵🇱
Every component of the NBX‑20 Astro Hub is engineered, tested, and assembled in Warsaw – using high-performance materials, industrial-grade harmonic drives, and custom mechanical design to achieve a product that punches far above its weight class.
🔄 Compatible Accessories (sold separately)
-
Counterweight shaft + weights
-
Nebula Mechanics precision equatorial wedge (CNC or 3D-printed)
- Nebula Mechanics Carbon Tripod
-
Nebula Mechanics Electronic Focuser
- Nebula Mechanics Temperature Sensor
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