Non classé Archives - WinStars 3

Try the next version of WinStars built with Qt 6

WinStars 3 is currently based on the Qt 5 software library, which allows for compatibility with all platforms, among other features. However, this Qt 5 version is now becoming obsolete, and it’s time to switch to the latest available version. This transition will help reduce incompatibilities with the most recent operating systems and introduce new features to the program.

Since this is a major update, it is likely that numerous issues will arise during this transition. That’s why I have decided to offer a beta version for in-depth testing.

If you’re interested, you can try out this test version for Windows by clicking on the following link:

Or find a beta version compatible with arm68-v8a processors running on Android:

If you encounter any errors, it’s crucial to report them to me. You can use the forum or send a message to the following address:

Thank you in advance for your valuable assistance!

Version 3.0.270 : the latest astronomy news

This is an old project that I’ve had in the back of my mind, and it’s taking on a new form in this latest version: using W3’s computational and visualization capabilities to illustrate current astronomical events.

We’ve already introduced the Artemis 1 mission and the ability to follow the Orion capsule in real-time. Ultimately, I’d like to do something much more complex, reproducing all phases of a mission’s life, from launch, trajectory corrections, to accessing scientific data. However, there are many obstacles to overcome. First, there are technical challenges (such as improving object appearance and adding more complex effects like projected shadows and metallic reflections), but even more difficult is gaining access to information regarding maintenance operations, orientation, engine ignitions, and data acquisition. This would require contact with a team member, which is not at all easy. But after all, I live about 50 kilometers from Madrid’s Deep Space Network… A lead to follow?

But the main feature of this version is the introduction of a new symbol (the letter i in red) indicating a link to an online article on

These high-quality popular science articles are written by astronomers or physicists, and I am reproducing them here with their permission. Many thanks to all these researchers who devote part of their time to informing the general public about the current state of research in astrophysics.

This version also fixes an issue with the Gaia EDR3 catalog, which was no longer accessible due to the URL change of the Astronomical Data Center of Strasbourg.

And finally… W3 is nearly 100,000 lines of C++ code that I maintain alone. It’s more than 3 GB of astronomical data stored on two servers that power the software. The program is capable of displaying over a billion objects. So, you can encourage me to continue by purchasing the full version, or by leaving a positive comment on Google Play, etc.

Thank you for your support!

3d landscapes and photogrammetry

Introducing 3D landscapes! For now, this new feature remains experimental. The program currently only displays a single object (a mesh) containing all the elements of the landscape (vegetation, buildings, etc.). These 3D objects have been obtained through photogrammetry, a technique that involves capturing a scene from multiple viewpoints to create a volumetric reconstruction.

The solar radio telescope element seen in WinStars.
The complexity of the mesh can be viewed by activating the 3D/wireframe mode option.

However, this solution is not optimal. The elements of the landscapes are still too approximate in places, and the files are too large. Later on, I will use the tessellation technique to improve rendering quality and reduce file size.

WinStars 3 is back: exoplanets and Artemis 1 mission

After several months of interruption, the development of WinStars is gradually resuming. Among the recent features, we can mention the addition of all known exoplanets, which can be easily located from the planetarium mode.

Since the first discoveries by Aleksander Wolszczan and Michel Mayor and Didier Queloz in the 1990s, thousands of exoplanets are now listed in catalogs. The Corot, Kepler, and Tess space missions have significantly increased their numbers in recent years, and the James Webb Space Telescope is also contributing to their direct observation. We can mention the example of HIP 65426 b and the first image of an exoplanet obtained in mid-infrared. This is a very young giant exoplanet, about 15 million years old, located 90 astronomical units from its star. With an estimated mass of about 7 times that of Jupiter, it was discovered using the European instrument SPHERE at the Very Large Telescope in 2017.

Images of the exoplanet HIP 65426 b observed by NIRCAM (3.3 and 4.4 microns) and MIRI (11.4 and 15.5 microns). The white star indicates the position of the host star. NASA/STScI/ESA published by Carter et al. 2022

The complete list of exoplanets can be accessed from the program by entering the command “list exo” in the search bar. You can also locate an object by simply entering its identifier. The database used by W3 comes from the website and will be updated every week.

51 Pegasi b was the first exoplanet identified around a main-sequence star. It was discovered in 1995 by Michel Mayor and Didier Queloz.

The revision 3.0.268 also proposes to follow the position of the Orion capsule in real time. The objective of this Artemis 1 mission is to return to the Moon in 2025 and ultimately maintain a more or less continuous human presence there.

The Orion capsule of the Artemis 1 mission.

The next revisions of W3 will include the ability to visit these exoplanets in the 3D Navigation mode. I also plan to add 3D landscapes to the planetarium mode (for fun) and many more features… But I’ll tell you more about that later.

I am continuing to improve the program’s stability. It is therefore essential to report any operational anomalies using the bugtracker or forums (here and there1). Thank you for your participation!

(1) A big thank you to Sora Kozima for creating this forum on!

Comets and asteroids in WinStars 3

The latest version of WinStars focuses on comets and asteroids, representing them as accurately as possible.

To achieve this, WinStars 3 queries the database when the user gets closer to one of these objects and retrieves the corresponding 3D model if it is available.

67P/Churyumov-Gerasimenko as imaged by the Rosetta mission.

Orbiting the Sun, comets and asteroids provide us with valuable information about the constitutive elements of planets. Having presumably evolved little since their formation 4.6 billion years ago, they appear as distant remnants of the primordial nebula that gave birth to our solar system. For this reason, these small celestial bodies have increasingly attracted the attention of scientists over the past few decades, who have developed numerous techniques to learn about their physical characteristics (shape, configuration, surface, geology, rotation period, etc.). Of course, there have been some interplanetary missions that have allowed us to approach them (such as Galileo, NEAR Shoemaker, Dawn, or Rosetta), but these missions are far too complex and costly to consider exploring the 390,000 asteroids cataloged so far in this way.

Asteroid (1) Ceres as seen from the Dawn probe.

Also, when one of these objects is located less than two million kilometers from Earth, it is sometimes possible to use powerful radio telescopes to image its surface and determine its size, morphology, rotation speed, and whether or not it is accompanied by one or more small satellites.

This is how asteroid 2021 PJ1 was observed on August 14, 2021, with the 70-meter antenna of the Deep Space Network located in Barstow, California. And it is with the Arecibo radio telescope that most radar imaging studies have been conducted, reaching a catalog of a thousand objects today.

However, the photometric method of light curves is most commonly used. Asteroids have such modest diameters (< 1000 km) that it is impossible to resolve them optically with the largest ground-based telescopes. But by observing variations in brightness of asteroids over about ten hours, one can mathematically reconstruct the object’s geometry and determine its rotation period. These light curves, which show minima and maxima as well as periods, provide clues about an elongated or spherical shape, surface irregularities, the presence of large craters, or the existence of a companion.

To complete this presentation, I can only recommend reading two articles by Stéphane Fauvaud on this subject, which you will find at the bottom of the page. I had the pleasure of accompanying him to the Pic du Midi observatory over the past ten years on missions to establish these light curves. Some of them now allow us to reproduce in 3D several asteroids present in W3.

For the time being, only objects with a number < 100 are represented in 3D in the paid version.

Most asteroids have an angular appearance and are not textured in the software. This means that the light curve method was used to determine their general shape. A mathematical method that provides no information about the photographic aspect of the surface.

WinStars 3 arrives on Raspberry Pi!

The Raspberry Pi is a credit card-sized nano-computer, designed by professors from the Computer Science Department at the University of Cambridge.

This computer was created with the goal of democratizing access to computers. Sold for less than €40 in its base version, it supports several variations of the free GNU/Linux operating system and also works on proprietary operating systems, such as Windows 10 IoT Core and Google Android Pi.

The Raspberry 4b board

Ode to Commodore

For a few weeks now, the Raspberry Pi Foundation has been offering a version equipped with a keyboard reminiscent of popular computers from the 1980s, such as the Commodore 64, the Amiga 500, and the ZX Spectrum. It is robust and features a passive cooling system, making it an interesting ally for your astronomical observations.

The Raspberry Pi 400

WinStars 3 is now available for free on these little machines. The installation may seem complex, but all you need to do is methodically follow these instructions in a terminal.

The program runs at 20 frames per second on the Raspberry Pi 400, and it is possible to improve performance by overclocking the computer. My Raspberry Pi 400, which operates at 2000 MHz, never exceeds 40°C (104°F) when I use W3.

This is an economical solution for controlling a telescope (the Raspberry Pi version includes the Indi module) while having access to all the features of the program, particularly the massive Gaia EDR3 star catalog, which is especially useful for performing asteroid reconnaissance and light curve measurements, for example.