It is a main-belt asteroid discovered on September 25, 1960, by Dutch-American astronomer Tom Gehrels and Dutch astronomers Ingrid van Houten-Groeneveld and Cornelis Johannes van Houten at Palomar Observatory. It is about 4.4km in diameter, making it larger than 99% of all the asteroids.
It is named after Heinrich Louis d'Arrest.

https://sv.wikipedia.org/wiki/9133_d%27Arrest

Heinrich Louis d'Arrest (13 August 1822 – 14 June 1875) was a German astronomer born in Berlin. As a student at the University of Berlin, d'Arrest was also working with Johann Gottfried Galle to search for a possible new planet.
On 23 September 1846, he suggested that a recently drawn chart of the sky in the same region of Urbain Le Verrier's predicted location for a new planet, could be compared to the current sky to seek for a new planet.
Neptune was discovered that very night.

Here are links to the contributors for discovering Neptun :

https://en.wikipedia.org/wiki/Heinrich_Louis_d%27Arrest

https://en.wikipedia.org/wiki/Johann_Gottfried_Galle

https://en.wikipedia.org/wiki/Urbain_Le_Verrier

Sun distance (au): 2.995 Mag. 18.9

Time: 23:17UT 2026-02-21 Exp. 90 x 30sec.
Tel. 0.254m f/5.8 ST-10XME CCD @ -25°C 1.9"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.