Tag Archives: Impact Crater

Sinus Iridum or Bay of Rainbows

Driving across “The Bay of Rainbows”

Sinus Iridum  aka the “Bay of Rainbows” is a plain of basaltic lava in the Northwestern portion of Mare Imbrium on Earth’s moon.
It is surrounded by the rugged Mountain Range known as Montes Jura.

Sinus Iridum was formed from the remains of a large impact crater, which was then flooded with basaltic lava, inundating the “sea” wall.
The Bay of Rainbows spans 236km or 146.64 miles across.

If you were to drive across the Bay of Rainbows at 60mph, (assuming no crater sized potholes, LOL!!) it would take ~ 2 hours and 26 minutes.
Roughly the distance from Dayton, Ohio to Versailles, Kentucky, or Dayton, Ohio to Nashville, Indiana.

This bay and the surrounding mountains is considered one of the most beautiful features on the Moon, and is a favorite among lunar observers.
It is one of the features on the Moon that can be seen with the unaided eye.

C8 Telescope & ZWO ASI 224MC Color Camera, 600 frames stacked in Registax 6, at my backyard observatory in Dayton, OH.

Best Regards,
John Chumack

Copernicus Impact Crater & Ejecta Rays

Copernicus Crater Named for Nicolaus Copernicus, the Crater is 93km or 58 miles across, that would be like a crater stretching from Dayton, Ohio  to Cincinnati, Ohio.  Copernicus Crater is  3.8km or 2.4 miles deep and has a relatively young and easily visible ejecta ray pattern.

The crater rays spread as far as 800 kilometers or  500 miles across the surrounding mare, that is about twice the width of the State of Ohio, and overlying rays from the craters Aristarchus
and Kepler. The rays are less distinct than the long, linear rays extending from Tycho, instead forming a nebulous pattern
with plumy markings. In multiple locations the rays lie at glancing angles, instead of forming a true radial dispersal.

Nicolaus Copernicus was a Renaissance mathematician and astronomer who formulated a heliocentric model of the universe
which placed the Sun, rather than the Earth, at the center.

I captured this close-up from my backyard observatory in Dayton, Ohio.

Image Details:
Lunar Impact Crater Copernicus on 05-10-2014

Canon Rebel Xsi DSLR Camera, 2x barlow, & 10″ F6.3 sct scope
ISO 400, 1/50 sec. exp.

Best Regards,

John Chumack