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Early Access Versions of AstroGrav

Registered users of AstroGrav 3 are entitled to download and use early access versions of AstroGrav when they are available. These give you the opportunity to try out and comment on new features before they are finalized and released to the general public, and your feedback can help identify bugs and influence the final form that new features take.

AstroGrav Early Access Software License Agreement

Early access versions of AstroGrav are only available to registered users of AstroGrav 3, and you must install them on a computer that already has a registered copy of AstroGrav 3.x.x (any version) installed on it.

You must click on the button below to accept the AstroGrav Early Access Software License Agreement before downloading any early access versions of AstroGrav.

Accept License Agreement  |   Decline License Agreement

AstroGrav Early Access Download

When you have accepted the license agreement, you can click on one of the buttons below to download the software.

The following early access versions of AstroGrav 3.8 / 4.0 have been released.

The documentation and tutorial have not yet been updated to cover the new features and changes. Please contact us if you require further information or advice.

AstroGrav 3.8 Early Access 01 was uploaded on 19th February 2019, and has the following improvements and bug fixes in addition to those in earlier versions.

  • Full Screen Mode

    When using the View / Full Screen Mode command, the following twelve keystroke commands are now available to adjust the view.

    • Control+Alt+K (Command+Alt+K on a Mac) greatly decreases the magnification.
    • Control+Shift+K (Command+Shift+K on a Mac) slightly decreases the magnification.
    • Control+Shift+L (Command+Shift+L on a Mac) slightly increases the magnification.
    • Control+Alt+L (Command+Alt+L on a Mac) greatly increases the magnification.

    • Control+Alt+J (Command+Alt+J on a Mac) greatly decreases the brightness.
    • Control+Shift+J (Command+Shift+J on a Mac) slightly decreases the brightness.
    • Control+Shift+B (Command+Shift+B on a Mac) slightly increases the brightness.
    • Control+Alt+B (Command+Alt+B on a Mac) greatly increases the brightness.

    • Control+Shift+T (Command+Shift+T on a Mac) shows objects using the standard object style.
    • Control+Shift+I (Command+Shift+I on a Mac) shows objects using the intermediate object style.
    • Control+Shift+H (Command+Shift+H on a Mac) shows objects using the photographic object style.
    • Control+Shift+C (Command+Shift+C on a Mac) shows objects using the circular object style.

    These keystroke commands are identical to the keyboard shortcuts that are used in the View / Magnification, View / Brightness, and View / Object Style menus.

  • Black Hole Objects

    The choice of object types has been expanded with the addition of a Black Hole type, together with four subtypes. Unlike other object types where the mass and radius of the object are independent, the mass and radius of black hole objects are linked by the formula for calculating the Schwarzschild radius from the mass. If you edit either the mass or the radius of a black hole object, the other quantity will automatically be calculated using this formula. As a consequence of the relationship between the mass and radius of black hole objects, it is the sum of the radii rather than sum of the volumes that is conserved when two black hole objects collide and combine.

  • Other Improvements

    Other improvements include the following.

    • A bug has been fixed that often caused the Window / Bring All To Front item to disappear from the Window menu.
    • Sorting has been greatly speeded up when using extremely large tables, such as the ones that occur when using the JPL Asteroids imports in the Edit / Import Objects... command.
    • A bug has been fixed that made it impossible to distinguish between selected and deselected tools when using the View / Customize Tool Bar... command on a Mac.
    • The default mass threshold of a new simulation has been changed from 1.0e20 kilograms to 0.0 kilograms, so that the gravitational influence of all objects are taken into account during evolution.

AstroGrav 3.8 Early Access 02 was uploaded on 14th March 2019, and has the following improvements and bug fixes in addition to those in earlier versions.

AstroGrav 3.8 Early Access 03 was uploaded on 24th March 2019, and has the following improvements and bug fixes in addition to those in earlier versions.

AstroGrav 3.8 Early Access 04 was uploaded on 5th April 2019, and has the following improvements and bug fixes in addition to those in earlier versions.

AstroGrav 4.0 Early Access 05 was uploaded on 1st May 2019, and has the following improvements and bug fixes in addition to those in earlier versions.