### Report on the Space Object ‘Oumuamua

#### 1. Introduction

‘Oumuamua, formally designated as 1I/2017 U1, is a unique interstellar object that was first observed on October 19, 2017, by the Pan-STARRS1 telescope in Hawaii. Its discovery marked the first time an object from another star system was detected passing through our solar system. ‘Oumuamua's unexpected appearance and unusual properties have intrigued scientists and prompted extensive research to understand its origins and characteristics.

#### 2. Classification

The classification of ‘Oumuamua has been a topic of debate since its discovery. Initially, it was classified as a comet due to its hyperbolic trajectory, suggesting an interstellar origin. However, it lacked the typical features of a comet, such as a visible coma or tail, which led to its reclassification as an asteroid. Given its unique properties that don't fully align with those of comets or asteroids, it is more accurately classified as an interstellar object. This designation is justified by its origin from outside our solar system and its anomalous behavior.

#### 3. Structure and Components

The exact structure and composition of ‘Oumuamua remain uncertain due to the limited observational data. It is hypothesized to be composed of metal-rich rock or a combination of ice and dust. Some theories suggest that it could have a solid, monolithic structure, while others propose that it might be a conglomerate of loosely bound materials. The absence of outgassing indicates it lacks significant volatile materials, differentiating it from typical comets.

#### 4. Appearance, Shape, Composition & Size

‘Oumuamua's appearance is highly unusual. It has an elongated, cigar-like shape, with an estimated length of about 800 meters and a width of around 80 meters, giving it an aspect ratio of approximately 10:1. This shape is unlike any asteroid or comet observed in our solar system. Spectroscopic observations suggest that its surface is covered with a reddish layer, likely due to prolonged exposure to cosmic rays. The exact composition is unknown, but it may include metals, silicates, or organic-rich compounds.

#### 5. Reason for its Name

The name ‘Oumuamua is derived from the Hawaiian language, meaning "scout" or "messenger." This name reflects the object's status as the first known interstellar visitor, metaphorically acting as a scout from another star system. The name was chosen to honor the Hawaiian observatory where it was discovered.

#### 6. Indications of Origin

The precise origin of ‘Oumuamua is still under investigation. Its hyperbolic trajectory indicates that it came from outside the solar system, traveling through interstellar space for millions of years. Some researchers suggest it could have originated from a binary star system, where gravitational interactions could have ejected it into interstellar space. Others propose it might be a fragment from a larger body disrupted by a close encounter with a massive star or black hole.

#### 7. Observations

‘Oumuamua was first observed by the Pan-STARRS1 telescope and subsequently by numerous telescopes worldwide, including the Hubble Space Telescope. These observations provided data on its trajectory, speed, and rotational properties. Photometric measurements revealed its rapid rotation and significant brightness variations, suggesting a tumbling motion. Despite extensive efforts, no definitive outgassing or emission signatures were detected, challenging initial cometary classifications.

#### 8. Trajectory

‘Oumuamua entered the solar system from the direction of the constellation Lyra, moving at an exceptionally high velocity of about 315,000 kilometers per hour. Its hyperbolic trajectory indicates it is not gravitationally bound to the Sun and will exit

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