Titania

Identity and classification

Titania is a moon of Uranus and is identified in the supplied record as MOON-ATLAS-URANUS-TITANIA. NASA evidence consistently describes it as Uranus’s largest moon and places it among the planet’s five major moons, alongside Miranda, Ariel, Umbriel, and Oberon. Another NASA source says Titania and Oberon are the largest Uranian moons and were the first to be discovered. The available material does not, however, provide an official identifier for Uranus, so no official container identifier can be entered in this profile.

Discovery and observation

The stated discovery date is January 11, 1787, and the discoverer was the British astronomer William Herschel. Nearly two centuries after that discovery, Voyager 2 images revealed signs that the moon had been geologically active. NASA states that Voyager 2 made a close approach to Uranus in January 1986 and acquired images of the planet and some of its moons; a gallery further specifies that a high-resolution color composite of Titania was made from images obtained on January 24, 1986. These references establish a specific observational basis, but the supplied evidence does not give the flyby distance, image resolution, or fraction of surface coverage.

Surface and geological activity

The statement concerning geological activity comes from interpretation of Voyager 2 imagery: the sources say that the imagery showed signs of geological activity. That wording matters. The evidence does not list the observed landforms, date surface materials, or establish whether the activity was recent, ancient, or ongoing. It is therefore supported to say that morphology seen by Voyager 2 led to this interpretation, but not that present-day activity has been demonstrated. The supplied material also contains no measurements or descriptions of craters, plains, faults, topography, albedo, color, geological-unit composition, or erosion processes.

Composition and internal structure

A NASA/APOD description calls Titania a large “dirty iceball,” composed of roughly half water ice and half rock. This is the only quantified compositional information in the evidence. It should be read as a broad global characterization: the material does not state the inference method, uncertainty range, or whether the proportion refers to the surface, the bulk body, or an internal model. Consequently, it cannot establish whether ice and rock are uniformly mixed, layered, or regionally concentrated. It also supplies no information about minerals, ices other than water ice, dark material, porosity, a possible internal ocean, a core, or a mantle.

Orbit, rotation, and environment

Titania belongs to the Uranian system, but the supplied sources give no semimajor axis, eccentricity, inclination, orbital speed, orbital period, or resonance information. Likewise, they provide no rotation period, pole orientation, libration, or evidence from which a rotational state can be described. No rings of Titania or moons orbiting Titania are reported. The evidence does mention Uranus’s rings in the Voyager 2 context, including discovery of a tenth ring on January 23, 1986, but that is a property of the planetary system and does not establish a specific physical relationship with Titania.

Exploration and scientific importance

According to NASA, only one spacecraft has explored Uranus: Voyager 2. The 1986 imagery therefore occupies a central place in the observational knowledge cited here. The existence of a mosaic assembled from Voyager imagery and drawn from a JPL/Caltech-generated planetary-map database also shows that these data were reused for cartographic representation. Within the evidence, Titania is scientifically important for three reasons: it is the largest Uranian moon; its broad composition is described as an approximately equal mixture of water ice and rock; and its morphology displays features interpreted as indications of past or otherwise temporally unspecified geological activity.

Limits, open questions, and discrepancies

The omissions are substantial. No supplied data address an atmosphere, pressure, exosphere, magnetic field, temperature, mechanical properties, geochronology, interior, or habitability. There is also no technical account of Titania’s formation or evolution; any scenario involving accretion, differentiation, or heating would be speculative from these sources alone. Uranus’s number of known moons is given as 28 in one source and as 29 as of August 2026 in another. That temporal or editorial discrepancy does not affect Titania’s identification, but it argues against presenting one unqualified count. Finally, one item concerns Titan, Saturn’s moon, not Titania; it must not be used to attribute surface liquids, global mapping, or any other Titan-specific property to Titania.