Sunday, June 28, 2020

Explore the Moon - Sinus Medii

Background

Sinus Medii (Bay of the Centre) can be found, as the name suggests, right in the centre of the nearside of the Moon.  Its flooded floor has the origin of the Moon's coordinate system.  It is located south of Mare Vaporum and north of Ptolemaeus.  

Sinus Medii (Image Credit: NASA LRO)
Observation

My abbreviated observation record can be found below:

 Date 2020-05-29
 Time  23:31
 Sky   Clear
 Telescope 8" Reflector (1200mm F.L.)
 Eyepiece 10mm (2x Barlow)
 Magnification 240x

Comments

I observed Sinus Medii to the southwest of Mare Vaporum.  I noticed immediately what appeared to be lines of mountains in a 'pincer' type pattern with a moderately sized crater (Pallas) at the apex with central peaks.  The pincer mountain formation was located in the northwest edge of Sinus Medii.  On the northern most pincer there was a small crater (Chladni) at the end of the mountain chain.  A slightly larger crater (Triesnecker) was seen just to the east of Chladni.  When the seeing was steady I was able to make out a couple smal craters (Bruce and Blagg) in the southern regions of the bay.

Location

To help you locate this object a map has been provided from the Royal Astronomical Society of Canada's Observer's Handbook.  It is object SM, highlighted below.

Sinus Medii (Bay)

Another great view is from the Apollo 16 mission.  This view below has the southeastern edge in the foreground while viewing across to the northwestern edge.  On the front edge the crater Rhaeticus is visible with a strong ring of mountains around it.  Further to the back on the right side is the 27km diameter Triesnecker.

Sinus Medii (Image Credit: NASA Apollo 16)

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