Sinas is a small lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 that lies in the eastern part of the Moon

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 on the Mare Tranquillitatis

Mare Tranquillitatis

Mare Tranquillitatis is a lunar mare that sits within the Tranquillitatis basin on the Moon. The mare material within the basin consists of basalt formed in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are thought to be of the Lower Imbrian epoch, but...

, named after the Greek magnate Simon Sinas

Simon Sinas

- Biography :Simon Sinas was born in 1810 in Vienna. He was of Greek origin, while his family originated from Moscopole. He served as Greek Consul in Vienna, and later as Minister to Austria, the Kingdom of Bavaria, and Germany. The son of Georgios Sinas, also a benefactor and diplomat, Sinas...

. This is an isolated formation that is located very near the mid-point of the lunar mare

Lunar mare

The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas. They are less reflective than the "highlands" as a result of their iron-rich compositions, and...

. The nearest crater of note is Jansen

Jansen (crater)

Jansen is lunar crater in the north part of the Mare Tranquillitatis. It is located to the east-southeast of the crater Plinius. The rim of Jansen is low and narrow, with a notch along the western edge. The interior is relatively level, which may indicate it has been covered by lava...

to the northwest. Sinas is circular and bowl-shaped, with a small floor at the mid-point.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Sinas.

Sinas	Latitude	Longitude	Diameter
A	7.8° N	32.6° E	6 km
E	9.7° N	31.0° E	9 km
G	9.6° N	34.3° E	5 km
H	10.0° N	33.5° E	6 km
J	10.3° N	33.7° E	6 km
K	6.8° N	33.1° E	5 km