VALLIS SCHROTER



Type: Rille

Geological period: Imbrian (From -3.85 billions years to -3.2 billions years) ?



Size:

Dimension: 165.0x165.0Km / 97.0x6.0Mi

Height: 1000.0m / 3000.0ft

Height/Wide ratio: 0.0063



Description:

Remarkable rille. Directs to the North then turn to the West. Width varying 6 to 10 km. decreasing to 500 m to its West extremity.

Begins to 25 km to the North of Herodotus by a lengthened craterlet called 'the Head of Cobra'. Floor covered by a 200 m wide rille.



Observation:

Interest : Exceptional formation

Observation period: 4 days after First Quarter or 3 days after Last Quarter

Minimal Instrument: 100 mm refractor



Position:

Longitude: 51.0° West

Latitude: 26.0° North

Quadrant: North-West

Area: Aristarchus crater region

ARISTARCHUS



Type: Crater

Geological period: Copernician (From -1.1 billions years to present days)



Size:

Dimension: 41.0x41.0Km / 24.0x24.0Mi

Height: 3000.0m / 9100.0ft

Height/Wide ratio: 0.075



Description:

Circular formation visible during the Earthshine. Important rays. Transcient phenomena. Forms an interesting couple with Herodotus. Young

formation (450 millions of years).

Steep slopes especially to the North.

High walls in terraces.

Few and extensive flat floor. Small central mountain.



Observation:

Interest : Exceptional formation

Observation period: 4 days after First Quarter or 3 days after Last Quarter

Minimal Instrument: 50 mm refractor

HERODOTUS



Type: Crater

Geological period: Upper Imbrian (From -3.8 billions years to -3.2 billions years)



Size:

Dimension: 36.0x36.0Km / 21.0x21.0Mi

Height: 1440.0m / 4400.0ft

Height/Wide ratio: 0.0411



Description:

Circular formation.

Steep slopes to the South and to the East.

Few high walls supporting the craterlet Herodotus N to the North.

Flat floor filled with somber lava. Starting point of Vallis Schröter to the North.



Observation:

Interest : Very interesting formation

Observation period: 4 days after First Quarter or 3 days after Last Quarter

Minimal Instrument: 50 mm refractor