Evidence for existence of dark matter
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Evidence for dark matter comes from multiple, independent lines of observation across astrophysics and cosmology. Here are the main ones: 1. Galaxy Rotation Curves 2. Gravitational Lensing 3. Cosmic Microwave…
June 2025
Linux Ubuntu for Radio Astronomy: ACM0 Service for PicoMuon
The error message: means that systemd can’t find a service file named PicoMuonACM0.service. To resolve this, you’ll need to create, place, or enable the service file correctly. Here’s how to…
Comparing image mosaic software for astrophotography
The best image mosaic software for night sky (astrophotography) mosaics depends on your goals, budget, and level of control needed. Here’s a curated list of the most recommended options for…
Reducing noise in radio telescope systems
Reducing noise in a 1420 MHz radio telescope setup (i.e., for detecting the hydrogen line) involves addressing both internal and external sources of interference. Here are the most effective steps…
Can 3dB amplifier compensate for 3dB loss in filter at 1420MHz?
If I use a filter at 1420 MHz that causes 3 dB loss and in amplifier beforehand that gives 3dB gain, will that cancel it out? Not exactly — a…
Using long Yagi antenna tuned for 1430 MHz for 1420 MHz
A long Yagi antenna tuned for 1430 MHz can still work at 1420 MHz, but with reduced efficiency and some detuning effects. Here’s a breakdown of what you can expect:…
TV satellite frequencies in the USA
TV satellite frequencies in the USA vary depending on the satellite, provider, and whether the service is free-to-air (FTA) or encrypted. Here’s a general overview: 🛰️ Main Satellite Bands Used…
Beamwidth, Half-Power Beamwidth, Field of View
The amount of sky covered by a radio telescope is typically referred to as its field of view (FoV). Key Terms: FoV≈λD radians\text{FoV} \approx \frac{\lambda}{D} \text{ radians} where λ\lambda is…
Results LRO-H2 Mapping exercise 11/4/2025-1/6/2025 (processed 1/6/2025)
These are the results so far of my mapping exercise with the 1.5m parabolic solar cooker dish (LRO-H2): Powerpoint Presentation containing slides at bottom of this page: https://www.astronomy.me.uk/wp-content/uploads/2025/06/Results-LRO-H2-Mapping-exercise-110425-010625-010625.pptx Individual slides: