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AstroGrav
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Precision solar system simulations
Precision solar system simulations

19 followers
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AstroGrav 3.4 is now available for download. This includes all the improvements that have recently been available in the early access releases, plus all the updated documentation.

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The sixth early access version of AstroGrav 3.4 is now available for download. This includes a new 'Export...' command that has been added to the 'Window' menu. This allows you to export a text representation of the active window's contents that can be viewed in a text editor, word processor, or spreadsheet application.

A 'Use this as my home location' choice has been added to the location editor that is displayed with the 'Tools / Edit Locations...' command. This allows you to select the location that you want to use as the default for creating an ephemeris with the 'Tools / Generate Ephemeris...' command. A home location selector has also been added to the 'Ephemeris' tab of the preferences.

There are also several other user interface improvements and bug fixes. Full details are available by following the link below.

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The fifth early access version of AstroGrav 3.4 is now available for download. This includes object windows that have been redesigned to match the visual style of the new star windows, and in solar system simulations, ecliptic, equatorial, and horizontal coordinates have been added to object windows that are opened by double-clicking on an object in a view window. All of the information displayed updates continuously as a simulation evolves.

The 'View / Fix…' and 'View / View From…' commands have been enhanced to allow fixing and viewing from background stars in solar system simulations. The Tycho designation has also been added to a background star's information window.

There are also many other user interface improvements and bug fixes. Full details are available by following the link below.

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The fourth early access version of AstroGrav 3.4 is now available for download. This features major improvements to the information windows that are displayed after double-clicking on background stars in a solar system simulation. These have been changed from dialogs that must be closed before continuing into windows that can be left open as long as desired, and that update as necessary as the time and viewpoint changes. There are also many improvements to the information that is displayed, with the addition of the viewpoint, improvements to the Flamsteed and Bayer designations, and the addition of boxes showing ecliptic coordinates, J2000 equatorial coordinates, galactic coordinates, and horizontal coordinates.

There are also many other improvements and bug fixes. Full details are available by following the link below.

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The third early access version of AstroGrav 3.4 is now available for download. There have been many improvements made since AstroGrav 3.3.3 was released in late July, the most significant of which are a greatly expanded range of particle types, the addition of new commands related to 3D views, and much improved and simplified ephemeris tables. There are also many other improvements and bug fixes. Full details are available by following the link below.

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AstroGrav 3.3.3 is now available for download. This includes a wide range of minor improvements and bug fixes, revised sample simulations, and all the updated documentation.

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The seventh early access version of AstroGrav 3.3.3 is now available for download. Evolution with general relativity is now more accurate and slightly faster, a bug has been fixed that caused the mass threshold and radiation pressure settings to be ignored when displaying a re-opened simulation, and the commands for displaying minimum orbit intersection distances (MOIDs) have been enhanced to deal with parabolic, hyperbolic, and anti-hyperbolic orbits, as well as orbits that don't share a common focus. There are also several other minor improvements and bug fixes.

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The fifth early access version of AstroGrav 3.3.3 is now available for download. The accuracy of ephemeris table calculations with 'Light-Time Correction' has been improved, and the system error messages that were written when a user lacked administrator privileges have been removed. There are also several other minor improvements and bug fixes.

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The third early access version of AstroGrav 3.3.3 is now available for download. The Solar System sample simulations have been updated to use the ICRF/J2000.0 reference frame. Earlier versions of these simulations included a small translation of the reference frame that has now been removed, so that objects' position and velocity components now exactly match those provided by the NASA/JPL HORIZONS system. The sample simulations have also been modified to make much better use of larger screens. There are also several other minor improvements and bug fixes.

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This is an AstroGrav screenshot that shows the distribution of all known comets in the solar system. A corresponding video at http://www.astrograv.co.uk/blog.html#16_05_31 shows the same simulation seen from various different viewpoints, with the planets and their orbits also shown to give an idea of relative scale.

Several concentrations of comets are evident. The concentration in the inner solar system is the result of comets being much easier to discover in the inner solar system, partly because comets are much brighter when nearer the Sun, and partly because such comets are also closer to the Earth. The other concentrations of comets are different groups of sungrazing comets, with the largest group consisting of over 1,200 Kreutz sungrazers. Smaller groups are Mayer sungrazers, Kracht sungrazers, and Marsden sungrazers.
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