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AstroGrav
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Precision solar system simulations
Precision solar system simulations

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AstroGrav 3.6 is now available for download. This includes a significant enhancement to the evolution commands that allows you to evolve immediately to specific solar system events without the tedious trial and error process that was necessary with earlier versions. The types of events covered are oppositions, conjunctions, quadratures, transits, and minimum / maximum elongations and distances. The events can be sought either forward or backward in time, and it's easy to repeat the process so as to find a list of forthcoming oppositions of Mars for example.

A recent change to the web addresses used by the International Astronomical Union's Minor Planet Center has resulted in earlier versions of AstroGrav being unable to access the data, with the result that the corresponding asteroid and comet import tables appear empty. Version 3.6 fixes this problem, so that these import tables can now be used again. In the event that no data is found when attempting to refresh an import table, AstroGrav now reverts to the cached table, rather than overwriting the cached table with an empty table.

There are many other minor improvements and bug fixes, plus all the updated documentation. You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_6.html
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The first early access version of AstroGrav 3.6 is now available for download to licensed users. This includes a major enhancement to the 'Evolve / Evolve To…' command that allows you to evolve to particular events in solar system simulations. The options available are:

(1) The next or previous opposition of any chosen object.
(2) The next or previous conjunction of any chosen object.
(3) The next or previous quadrature of any chosen object.
(4) The next or previous transit of any chosen object.
(5) The next or previous minimum elongation of any chosen object.
(6) The next or previous maximum elongation of any chosen object.
(7) The next or previous minimum distance of any chosen object.
(8) The next or previous maximum distance of any chosen object.

There are also several other minor improvements and bug fixes.

Full details are available by following the link below.
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AstroGrav 3.5.1 is now available for download. Most importantly, this includes a fix for a bug that could cause the evolution algorithm to misbehave in some simulations. In addition, the names of the background stars in solar system simulations have been changed to conform to the recently published list in the IAU Stellar Name Catalogue. There are various other minor improvements and bug fixes.

You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_5_1.html
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There's a good animation here:

https://www.youtube.com/watch?v=oBJFEYC_ucw
Our Kepler mission’s search for new planets teamed with machine learning to discover another solar system with an 8th planet that is 2,500 light-years away. Here’s what you need to know about the #Kepler90 discovery: https://nasa.tumblr.com/post/168542791629/researchers-just-found-for-the-first-time-an-8th
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An AstroGrav video has been added that shows a simulation of the Kepler-90 planetary system, as described in many media articles in December 2017.

This system was in the news on 14th December 2017 because it’s the first exoplanet system found to have eight planets, like our solar system. It was already known to have seven planets, but an eighth has been discovered. The inner three planets are rocky (like the inner four of the solar system), the next three are ice giants (like Uranus and Neptune), and the outer two are gas giants (like Jupiter and Saturn). The main difference from the solar system is that the distances are all on a much smaller scale, with the outermost planet about the same distance from Kepler-90 as we are from the Sun. As a consequence, most of the planets are very hot, and none of them are cold. All eight planets have almost circular orbits.

They’re about 2,500 light years away, so quite distant. There’s lots more information here:

https://en.wikipedia.org/wiki/Kepler-90
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AstroGrav 3.5 is now available for download. This includes a new evolution algorithm that is both more accurate and significantly faster in many cases. It also contains enhancements to the import of asteroids and comets and the handling of tables, as well as a new command for removing objects in such a way as to leave the orbits of other objects unchanged.

There are many other minor improvements and bug fixes, plus all the updated documentation. You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_5.html
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The first early access version of AstroGrav 3.4.4 is now available for download. This includes a range of minor improvements that will be particularly welcome to those of you who use AstroGrav to generate ephemerides.

Full details are available by following the link below.
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AstroGrav 3.4.3 is now available for download. This includes a fix for a serious bug that prevented the 'Edit / Import Objects...' command from working with the JPL options after a recent upgrade to the JPL server software. There are also minor improvements to the evolution algorithm, and the number of items in the list of recently used simulations has been increased from 10 to 20.

You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_4_3.html

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AstroGrav 3.4.2 is now available for download. This includes a fix for a serious bug that could cause AstroGrav to freeze during startup, making it unusable. There are also corrections to a fault that caused clicking on a table header for sorting to sometimes be ignored, and a fault that caused evolution calculations to continue after using the 'Evolve / Stop' command, leading to potential future problems.

You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_4_2.html

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AstroGrav 3.4.1 is now available for download. This includes improvements and bug fixes to object importing, enhancements to view windows and object windows, and the addition of new units. There are also many other improvements, plus all the updated documentation.

You can view the full details of the new release at:

http://www.astrograv.co.uk/version-3_4_1.html
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