Add-on Submissions 22W25

[DaveBowman2001]

Submit your add-ons in this issue, thanks for your contribution! Submission template:

**Title:**
**ID:** (optional, use only to determine which addon in mobi to update)
**ID Requirement:** (optional, ID decides the order of loading, might need special requirement if an add-on has dependencies)
**Description (Legacy)**: (plain text description of the add-on)
**Description**: (optional, rich content description of the add-on which includes additional images, videos, tables etc. which also replaces the old Additional metadata format. If it is plain text, put it in Description (Legacy) and leave this empty)
**Proposed category:** (pick one of the existing categories (https://celestia.mobi/resources/categories), or suggest a new one)
**Demo Object Name:** (optional, the name of the main object used for Go to command)
**Author(s):** (optional)
**Release date:** (optional, The date this original add-on is released. If left empty, will be the date the add-on is uploaded here)
**Link to download:** (Please use zip to package the add-on, it should NOT contain a file called description.json)
**Image:** (optional, no UI control element, HUD display, label. Avoid using "tall" pictures (height > width))
**Thumbnail:** (optional, by default will be the downscaled version of Image if present, so unless you want something different to show as a thumbnail, leave it empty)
**Disable comments**: (optional, by default, comments are not disabled)

For Updates to Existing Add-ons

For updates to existing add-ons, please attach the id to the add-on and only include updated fields from the template. For removal of add-ons, please attach the id too.

The id is part of the link to the add-on: For example, this addon below has an id of A4577B17-4C60-0C1E-CAB5-92A604FF0EC3 https://celestia.mobi/resources/item?item=A4577B17-4C60-0C1E-CAB5-92A604FF0EC3

Check Before Uploading an Add-on

Your add-on will be running on Android/iOS/macOS/Windows, to enable maximum compatibility, please ensure that:

1. File names referenced in models, ssc, dsc files, etc. are exactly the same as the actual file names (some file systems are case sensitive. For example if in your .ssc there is Mesh "Progress.cmod", then the file name should be exactly Progress.cmod not progress.cmod).
2. Textures should have width/height of power of 2 (for example: 1024 512, a texture of 1000 500 will not work on many mobile devices).
3. If your add-on requires specific Celestia versions, please mention in the description. Please also ensure that your add-on should not crash running on other versions.
4. If you are updating an existing add-on, note that existing users will not see an update button, so it might be a good idea to include version history in the description.
5. Please try to use smaller files for image/thumbnail/other metadata. For example, use JPG if alpha value is not needed.

Example:

Title: Kepler-1649 Description: The Kepler-1649 planetary system, which is a red dwarf star orbited by a Venus-analogue and an Earth-analogue. Alternate surfaces for planet c are included. Proposed category: Exoplanets Demo Object Name: Kepler-1649/c Author(s): SevenSpheres Release date: 2020-07-16 Link to download: Kepler-1649.zip Image:

For New Categories

If a New Addon does not fit into any existing category, you can propose a new one by following the format below:

**Short Name**: (used when context about parent category is given somewhere)
**Full Name**:
**Description**:
**Parent**: (N/A if it is a root category)
**Children**: (N/A if it is a leaf category, you might want to change children's short names to be concise)
**Image**: (must be about 3000 * 1000 pixels in size in order for the whole image to fit)

Example: For Parent Category Full Name: Exoplanets Description: Artistic Impressions of real exoplanets arranged by confirmation status and discovery years Children: Early Years, Kepler Era, TESS Era, Unconfirmed Image:

Example: For Children Category Short Name: Unconfirmed Full Name: Exoplanets: Unconfirmed Description: These addons depict the star systems whose planets were spotted but is yet to be confirmed by follow-up observations Parent: Exoplanets Image:

[SpaceExplorer2008]

Title: 7P/Pons–Winnecke Description: 7P/Pons–Winnecke is a periodic comet of the Jupiter family with an orbital period of 6.37 years. It was discovered in June 1819 by Jean-Louis Pons, and rediscovered by Friedrich August Theodor Winnecke in March 1858. The comet is the parent body of the Bootid meteor shower. Early calculations of the 1921 appearance showed the possibility of the comet colliding with Earth, but later calculations ruled out this possibility. Despite this, the comet passed close to Earth in June 1927 at a distance of 6 million kilometers (0.04 AU). Proposed Category: Comets Demo Object Name: 7P Pons–Winnecke Author(s): Art Blos Release date: 2022-06-24 Link to download: https://drive.google.com/file/d/1EBYjJzh75MdeKmJNjHQA0-DgJicoLnCu/view?usp=drivesdk Image:

[SpaceExplorer2008]

Title: 8P/Tuttle Description: 8P/Tuttle is a periodic comet with an orbital period of 13.6 years. It was discovered in January 1858 by Horace Parnell Tuttle. Radar observations made by the Arecibo observatory in January 2008 indicate that the comet is a contact binary. Proposed Category: Comets Demo Object Name: 8P Tuttle Author(s): Art Blos Release date: 2022-06-24 Link to download: 8P Tuttle.zip Image:

[SpaceExplorer2008]

Title: 10P/Tempel Description: 10P/Tempel, also known as Tempel 2, is a periodic comet of the Jupiter family with an orbital period of 5.36 years. It was discovered in July 1873 by Wilhelm Tempel. The comet's nucleus is estimated to be approximately the size of Halley's Comet, at 10.6 kilometers in diameter. Proposed Category: Comets Demo Object Name: 10P Tempel Author(s): Art Blos Release date: 2022-06-24 Link to download: 10P Tempel.zip Image:

[DaveBowman2001]

@DaveBowman2001 I thought of something here, tell me if it's a good idea:

toutatis created several martian orbiters with full xyzv trajectories. On the mobi. site, you modified the addons and left only the beginning of the orbiters' trajectory xyzv around Mars, with the rest being defined with ssc. But with the ssc orbit in certain orbiters some things are not simulated, for example the flybys of Phobos carried out by Mars Express and MAVEN.

With that, I'm thinking of uploading an alternative version for Mars Express and MAVEN with full xyzv trajectories in case someone wants to simulate their orbits with high precision and flybys of Phobos. I would also find it interesting to do this with the venusian orbiter Venus Express, since it performed aerobrakings in 2014. For martian orbiters like Mars Odyssey, Mars Reconnaissance Orbiter and ExoMars TGO it is not necessary, since after all they are in low orbits around Mars, not makes a lot of difference.

The problem with toutatis's full XYZV trajectories for Martian orbiters is that they take too long to load on Celestia. For example, MRO takes about a minute to load fully, and most of the time it crashes my phone (yes I tried it once before submitting that addon here). This is because the time steps used to accurately depict orbits around Mars and any other small celestial object has to be 10 minutes per entry, and that makes the file so big (each XYZV year is 8 MB). As much as we'd like to have accurate orbits for these orbiters, sadly it isn't practical in the case of mobile devices. We are fortunate enough that Cassini, Rosetta, and Galileo weren't too large for their full trajectories to be rendered. Besides, all Martian orbiters haven't changed their orbits significantly after their first year, so why bother having XYZV trajectories with them. John van Vliet pointed out that for very long recorded trajectories, SPICE trajectories are much more practical than XYZV. However I don't know how to read such files yet, so I stick with XYZV

[DaveBowman2001]

And would it be possible for you to create an xyzv trajectory of Tianwen-1 around Mars? It's okay if it's a little inaccurate. Tianwen-1 is the only recent Martian orbiter not simulated around Mars.

It is possible. On Discord, I posted a screenshot of my semifictional attempt of Tianwen-1 orbiting Mars, which was based on the last state vector data from HORIZONS, but I'm not satisfied with the result. Don't worry, it is being worked on as we speak

[SpaceExplorer2008]

Precisely for this reason, it would be an alternative version. The current version of the orbiters would remain, and a larger version would contain full trajectories. Of course the description would include a warning that it may take longer to load. And therefore, some addons actually take much longer to load, for example 1 million stars in the Andromeda Galaxy which when testing on my smartphone, it took more than 3 minutes for Celestia to load. Also, the only orbiters that would have full xyzv trajectories would only be Mars Express, MAVEN and Venus Express. Others like the Mars Reconnaissance Orbiter is not as necessary as it remains in low orbit around Mars.

[DaveBowman2001]

Yet still MEX, VEX, and MAVEN haven't changed their trajectories as significantly as the orbiters on the gas giants. It's just like creating an entire 24-year long XYZV trajectory for the ISS without ever seeing the station changing its orbit. Unless their models are greatly different between versions, posting an alternate version wouldn't make much of an appeal really for Celestia users.

The only Martian orbiter that you could potentially see its orbital plane changed is Tianwen-1, which originally orbited at 10° but later maneuvered to 86°. All the other orbiters did not do this

[SpaceExplorer2008]

Some other orbiters have also changed their orbit, but this change is natural, I believe it is caused by the very curvature of space-time generated by the planet. See the orbit of Mars Express. In July 2021, at the closest point to Mars, it passed over the north pole. In July 2022, it will pass through the south pole. As the orbital plane naturally changes, encounters with the moon Phobos may occur, such as occurred on January 14, 2016.

And Venus Express performed in 2014 a series of aerobrakings. It wasn't a very large orbit reduction, but it still exists.

[SpaceExplorer2008]

Title: 5 Astraea Description: 5 Astraea is a large S-type asteroid in the asteroid belt. It was discovered in December 1845 by Karl Ludwig Hencke. Proposed Category: Asteroids & NEOs Demo Object Name: Astraea Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 5 Astraea.zip Image:

[SpaceExplorer2008]

Title: 6 Hebe Description: 6 Hebe is a large S-type asteroid in the asteroid belt. It was discovered in July 1847 by Karl Ludwig Hencke. In 1977 a small moon around Hebe was reported, but detailed observations with the Very Large Telescope and the Hubble Space Telescope failed to find such a moon, and therefore its existence is questioned. Proposed Category: Asteroids & NEOs Demo Object Name: Hebe Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 6 Hebe.zip Image:

[SpaceExplorer2008]

Title: 7 Iris Description: 7 Iris is a large S-type asteroid in the asteroid belt. It was discovered in August 1847 by John Russell Hind. Proposed Category: Asteroids & NEOs Demo Object Name: 7 Iris Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 7 Iris.zip Image:

[SpaceExplorer2008]

Title: 8 Flora Description: 8 Flora is a large S-type asteroid in the asteroid belt. It was discovered in October 1847 by John Russell Hind. Proposed Category: Asteroids & NEOs Demo Object Name: Flora Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 8 Flora.zip Image:

[SpaceExplorer2008]

Title: 9 Metis Description: 9 Metis is a large S-type asteroid in the asteroid belt. It was discovered in April 1848 by Andrew Graham.

NOTE: Not to be confused with Jupiter's moon Metis.

Proposed Category: Asteroids & NEOs Demo Object Name: 9 Metis Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 9 Metis.zip Image:

[SpaceExplorer2008]

Title: 10 Hygiea Description: 10 Hygiea is a large C-type asteroid, or a possible dwarf planet in the asteroid belt. It is the fourth largest asteroid in the Solar System, measuring 434 kilometers in diameter. It was discovered in April 1849 by Annibale de Gasparis. Observations by the Very Large Telescope in 2017 and 2018 revealed that Hygiea is nearly spherical and close to hydrostatic equilibrium. Proposed Category: Asteroids & NEOs Demo Object Name: Hygiea Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 10 Hygiea.zip Image:

[SpaceExplorer2008]

Title: 22 Kalliope Description: 22 Kalliope is a large M-type asteroid in the asteroid belt. It was discovered in November 1852 by John Russell Hind. Kalliope has a moon, called Linus, which was discovered in August 2001 by Jean-Luc Margot and Michael E. Brown. Proposed Category: Asteroids & NEOs Demo Object Name: Kalliope Author(s): Art Blos, Greg Frieger Release date: 2022-06-25 Link to download: 22 Kalliope.zip Image:

[ghost]

Auch für die Star-Wars-addon, wenn es sein muss kann ich zusammen eine schnelle STC-Datei für einen neuen star für den Planeten zu umkreisen, um Konflikte mit RHO CrB tatsächlichen Planeten

Scheint fair genug. Bis wir eine richtige Star-Wars-Galaxie, um mit zu beginnen ich vermute mal, dass das so gut funktioniert. Viel leichter zu finden als das, was ein anderer Gedanke, den ich im Sinn hatte, das ist, streuen Sie über zufällige Sterne in der Milchstraße

Getan, ich werde umbuchen der Star-Wars-addon zu ändern, um fix die Beschreibungen.

Aktualisiert addon unten, ältere addon hier ( #22 (Kommentar) ) bitte ignorieren.

Titel: Tatooine, Endor und dem Todesstern Beschreibung (Legacy): Dies ist eine leicht veränderte und auferstanden basic package Jestr Star Wars-add-on. Es enthält Tatooine, Endor und dem Todesstern. Dieses Paket ist erforderlich für die meisten anderen Star-wars-add-ons Jestr. Die folgenden änderungen wurden mady von Ulrich Dickmann (Adirondack) im Dezember 2012: -richtigen Ordner-Struktur -fixed ssc-Datei

Aktualisiert am 6/20/2022 ändern der star der Addon an einer fiktiven star namens Jestr Star (benannt nach dem original-addon creator.)

Original release date ungeschnittenes addon 2004. Vorgeschlagene Kategorie: Fiktive: Star-Wars - Demo-Objekt-Name: Jestr ' s Star - Author(s): Jestr, Adirondack, Anthony_B_Russo10 Release date: 2012-12-22 14:48 Link zum download: StarWars_upd.zip Bild:

Zusätzliche Metadaten:

I've got a question. What do you have to do to make Jestr star work? With many thanks in advance.

[SpaceExplorer2008]

Title: Earth (Global Water Volume) Description: An interesting view of the amount of water on Earth.

• The biggest blue sphere represents all the water on Earth, in all things, including you.

• The middle blue sphere represents liquid fresh water (groundwater, lakes, swamp water and rivers).

• The smaller blue sphere represents all the fresh water present in rivers and lakes, which is most of the water that humans and life on Earth need.

Proposed Category: Planets and Moons Demo Object Name: Earth Author(s): ParticleGrasp Release date: 2013-05-16 Link to download: https://drive.google.com/file/d/1HVyqFhpWY9irZR5Gn6UJPzr_sIHtohh3/view?usp=drivesdk Image:

Additional Metadata:

[SpaceExplorer2008]

Title: 25143 Itokawa Description: 25143 Itokawa is a near-Earth S-type asteroid. It was discovered by the LINEAR program in September 1998. It measures 330 meters in diameter. Itokawa is considered a pile of rubble, consisting of several boulders of different sizes rather than a single solid body. Itokawa was the first asteroid to be targeted by a sample return mission, the Japanese space probe Hayabusa which collected more than 1500 regolith dust particles from the asteroid's surface in 2005. Upon their return to Earth in 2010, these particles were studied in detail to provide insights into the formation and evolution of the Solar System.

NOTE: This addon updates and modifies the existing version of asteroid Itokawa in Celestia.

Proposed Category: Asteroids & NEOs Demo Object Name: Itokawa Author(s): Art Blos, Greg Frieger Release date: 2022-06-26 Link to download: 25143 Itokawa.zip Image:

[SevenSpheres]

I've got a question. What do you have to do to make Jestr star work? With many thanks in advance.

Looks like Jestr's Star is missing a distance. As a 3D space simulator, Celestia can't render objects if it doesn't know the distance to them.

(Also, why do you translate posts to German when you reply to them? Especially since the reply is in English?)

[SpaceExplorer2008]

Title: 367943 Duende 367943 Duende (2012 DA14) is a small near-Earth L-type asteroid, only about 30 meters in diameter. It was discovered on February 23, 2012. On February 15, 2013, Duende passed just 27,743 kilometers above the Earth's surface. This disturbed Duende's orbit, which previously had an orbital period of 368 days, and shortly after passing close to Earth it was reduced to 317 days. Proposed Category: Asteroids & NEOs Demo Object Name: Duende Author(s): Art Blos, Greg Frieger Release date: 2022-06-26 Link to download: Duende.zip Image:

[SpaceExplorer2008]

Title: C/1980 E1 (Bowell) Description: C/1980 E1 (Bowell) is a non-periodic comet discovered in February 1980 by Edward L. G. Bowell. In December 1980, it passed at a distance of 0.228 AU from Jupiter, which accelerated the comet and consequently ejected it from the Solar System. It reached perihelion in March 1982, after which it will never return. Before approaching Jupiter, the comet had an orbital period of 7.1 million years.

NOTE: To find the comet you must search for C-1980 E1 Bowell

Proposed Category: Comets Demo Object Name: C-1980 E1 Bowell Author(s): Art Blos Release date: 2022-06-26 Link to download: https://drive.google.com/file/d/1IkLHwsOueAgLib7qCwd_VFgj4MARgo5p/view?usp=drivesdk Image:

[Anthony-B-Russo10]

I've got a question. What do you have to do to make Jestr star work? With many thanks in advance.

Looks like Jestr's Star is missing a distance. As a 3D space simulator, Celestia can't render objects if it doesn't know the distance to them.

(Also, why do you translate posts to German when you reply to them? Especially since the reply is in English?)

I fixed this issues, it was not the lack of distance that broke it, it was the lack of telling the program that it was a star. I also updated the download link in the original second post for the addon here.

[ghost]

Ich habe eine Frage. Was müssen Sie tun, um Jestr star zu arbeiten? Mit vielen Dank im Voraus.

Sieht aus wie Jestr Stern fehlt, ist ein Abstand. Wie ein 3D-Weltraum-simulator Celestia kann nicht Rendern der Objekte, wenn Sie nicht wissen, die Entfernung zu Ihnen. (Auch, warum übersetzen Sie Beiträge auf Deutsch, wenn du darauf zu Antworten? Vor allem, da die Antwort in Englisch?)

Ich reparierte diese Probleme, es war nicht der Mangel an Distanz, brach es, es war der Mangel an dem Programm sagen, dass es war ein star. Ich auch aktualisiert den download-link in der ursprünglichen zweite Beitrag für das addon hier.

Thank you so much.

[levinli303]

I've implemented better support for cache control on the server, so hopefully this reduces the workload on the server side. you should not notice anything except that loading a previously loaded page (within 30min or so) will be faster. I also reduced the response size for API calls (for old clients).

if you found anything unusual after this change please let me know.

[DaveBowman2001]

Some other orbiters have also changed their orbit, but this change is natural, I believe it is caused by the very curvature of space-time generated by the planet.

@SpaceExplorer2008 The orbital plane will have a gradual change naturally. However this is also seen on an SSC-defined orbit when you fast-forward time while locked on the satellite's parent object. On highly inclined Mars-orbiters, even if you convert a single XYZV vector into Keplerian elements, the overall orbital shape (for example MAVEN) remains the same after they reached their final operational orbit about a year after Mars arrival. There are sadly no intentionally planned flybys of these moons, only coincidences.

But since I do believe the mobi site will eventually be the main resource for Celestia addons in the foreseeable future. I'd suggest the other XYZV files be disabled by default. How to do this? Put them all in an extra ZIP file along with the SSC that will enable it. For instructions on how to use it for mobile, provide a tutorial that you can post in the Tutorials Submissions issue

See my example ZIP file template I made for MRO below. The default files only have XYZVs for Mars-Years 1 to 3, but the compressed folder inside (named "Alternate XYZV.zip") has all the other XYZVs (1 to 30) waiting to be activated along with a replacement SSC file:

Template: Mars Reconnaissance Orbiter.zip

In this way, we have no duplicate "alternate versions" on the Spacecraft category and thus make the whole download page more organized.

[SpaceExplorer2008]

A good idea, thanks. But would a Celestia user be able to activate the full xyzv path without having to access the CelestiaResources internal folder and unzip the file?

If so, I will update next week. First I have to continue to expand the categories of asteroids and comets.

I also believe that the site mobi. will soon be the biggest and perhaps the best place to download addons for Celestia as it gathers addons from Motherlode, Forum and Celestia Origin all in one place.

[DaveBowman2001]

Yes they could access it. In fact, the CelestiaResources internal folder is the only Celestia-Mobile related folder that is readily visible on the Phone's Storage by default (on Android, it is just located on the Android/Data folder, I'm not sure on iPhones though). This is why I suggest to post a tutorial on the Tutorials Submission issue on how this is done manually

[DaveBowman2001]

Ok, let's continue our discussions and submissions on #23 now

[ghost]

Auch für die Star-Wars-addon, wenn es sein muss kann ich zusammen eine schnelle STC-Datei für einen neuen star für den Planeten zu umkreisen, um Konflikte mit RHO CrB tatsächlichen Planeten

Scheint fair genug. Bis wir eine richtige Star-Wars-Galaxie, um mit zu beginnen ich vermute mal, dass das so gut funktioniert. Viel leichter zu finden als das, was ein anderer Gedanke, den ich im Sinn hatte, das ist, streuen Sie über zufällige Sterne in der Milchstraße

Getan, ich werde umbuchen der Star-Wars-addon zu ändern, um fix die Beschreibungen. Aktualisiert addon unten, ältere addon hier ( #22 (Kommentar) ) bitte ignorieren. Titel: Tatooine, Endor und dem Todesstern Beschreibung (Legacy): Dies ist eine leicht veränderte und auferstanden basic package Jestr Star Wars-add-on. Es enthält Tatooine, Endor und dem Todesstern. Dieses Paket ist erforderlich für die meisten anderen Star-wars-add-ons Jestr. Die folgenden änderungen wurden mady von Ulrich Dickmann (Adirondack) im Dezember 2012: -richtigen Ordner-Struktur -fixed ssc-Datei Aktualisiert am 6/20/2022 ändern der star der Addon an einer fiktiven star namens Jestr Star (benannt nach dem original-addon creator.) Original release date ungeschnittenes addon 2004. Vorgeschlagene Kategorie: Fiktive: Star-Wars - Demo-Objekt-Name: Jestr ' s Star - Author(s): Jestr, Adirondack, Anthony_B_Russo10 Release date: 2012-12-22 14:48 Link zum download: StarWars_upd.zip Bild: Zusätzliche Metadaten:

I've got a question. What do you have to do to make Jestr star work? With many thanks in advance.

How long will it last with Jestr's Star. Best regards from Germany

[levinli303]

Auch für die Star-Wars-addon, wenn es sein muss kann ich zusammen eine schnelle STC-Datei für einen neuen star für den Planeten zu umkreisen, um Konflikte mit RHO CrB tatsächlichen Planeten

Scheint fair genug. Bis wir eine richtige Star-Wars-Galaxie, um mit zu beginnen ich vermute mal, dass das so gut funktioniert. Viel leichter zu finden als das, was ein anderer Gedanke, den ich im Sinn hatte, das ist, streuen Sie über zufällige Sterne in der Milchstraße

Getan, ich werde umbuchen der Star-Wars-addon zu ändern, um fix die Beschreibungen. Aktualisiert addon unten, ältere addon hier ( #22 (Kommentar) ) bitte ignorieren. Titel: Tatooine, Endor und dem Todesstern Beschreibung (Legacy): Dies ist eine leicht veränderte und auferstanden basic package Jestr Star Wars-add-on. Es enthält Tatooine, Endor und dem Todesstern. Dieses Paket ist erforderlich für die meisten anderen Star-wars-add-ons Jestr. Die folgenden änderungen wurden mady von Ulrich Dickmann (Adirondack) im Dezember 2012: -richtigen Ordner-Struktur -fixed ssc-Datei Aktualisiert am 6/20/2022 ändern der star der Addon an einer fiktiven star namens Jestr Star (benannt nach dem original-addon creator.) Original release date ungeschnittenes addon 2004. Vorgeschlagene Kategorie: Fiktive: Star-Wars - Demo-Objekt-Name: Jestr ' s Star - Author(s): Jestr, Adirondack, Anthony_B_Russo10 Release date: 2012-12-22 14:48 Link zum download: StarWars_upd.zip Bild: Zusätzliche Metadaten:

I've got a question. What do you have to do to make Jestr star work? With many thanks in advance.

How long will it last with Jestr's Star. Best regards from Germany

Please stop posting this. I’ve already uploaded the lastet version to celestia.mobi. You should first uninstall and install again to see the latest version. If the issue persists, then the addon is still incorrect in ways