- Reduced Astrometry Tool (R.A.T.)

General Description

The Reduced Astrometry Tool (R.A.T.) allows generating astrometry of astrophotos using the Astrometry.net engine, specifically through solve-field and plot-constellations. Its main objective is to facilitate obtaining astrometry quickly and customizably, ideal for sharing on social media or saving as a visual record.

Note: This tool is not intended for scientific or professional use. For that, it is recommended to use nova.astrometry.net, which offers greater detail, precision, and persistent storage.

If you find any errors, have suggestions, or wish to collaborate, write to: Contact / Support: rat@chupacabra.cl

Main Features

• Supported formats: .jpg, .jpeg and .png
• Maximum size per image: 25 MB
• Results customization: font size, number of stars, RA and Dec grid
• Customizable watermark
• Temporary storage of original and processed image

User Guide

Usage is very simple. Here are the steps:

Step 1: Image Upload

Select the image you want to process. A thumbnail with its information will be displayed.

Step 2: Space Elements Options (Star Settings)

• Font Size: Text size for element labels
• Chart Constellations: Draws constellation lines
• Plot NGC Catalog: Shows objects like clusters, nebulae, galaxies
• Plot N Brightest Star: Shows the N brightest stars
• Plot Named Bright Star: Adds common names to stars

Step 3: Grid Settings

• Plot RA,Dec Grid: Activates the grid
• Grid Spacing: Spacing in arcseconds
• Grid Color: Color of grid lines

Step 4: Copyright Text (Other Options)

• Copyright Text: Text for watermark
• Text Position: Location in cardinal points
• Text Color: Text color (should contrast)
• Font Size: Font size
• Opacity: Opacity (100% = opaque, 0% = transparent)

Step 5: Process Image

Click on Upload Image. The button changes according to the process status:

Step 6: Results

• Processed image (click to view at full resolution)
• Object Information: Position and list of identified objects
• System Log: Processing log
• EXIF Data: Technical image data

Important: If the page is closed or reloaded, the process will continue, but the automatic preview will not be shown. The image will appear in the gallery later.