Home » News & Blogs » 11/20/2020 – Ephemeris – Martian Trojan asteroid may have come from our Moon
Bookmark and Share
Bob Moler's Ephemeris Blog

11/20/2020 – Ephemeris – Martian Trojan asteroid may have come from our Moon

20 Nov 2020, 05:01 UTC
11/20/2020 – Ephemeris – Martian Trojan asteroid may have come from our Moon
(200 words excerpt, click title or image to see full post)

This is Ephemeris for Friday, November 20th. Today the Sun will be up for 9 hours and 22 minutes, setting at 5:09, and it will rise tomorrow at 7:48. The Moon, 1 day before first quarter, will set at 10:39 this evening.
The way gravity works there are several gravitational sweet spots called Lagrangian points between orbital bodies. Two of those points, 60 degrees ahead of and behind a planet in its orbit, are called L4 and L5. Bodies at these points are called Trojan asteroids. Because the first ones found in Jupiter’s orbit were named after warriors of the Trojan War. What was discovered recently was that one of the planet Mars’ L5 Trojans is not like the others. It has a different composition as analyzed by a spectrograph. It reflects light like the Earth’s Moon, while the others appear to have come from Mars itself. Perhaps an ejected piece of the Moon made it out to Mars orbit. We know small meteoroids can make it planet to planet, maybe huge chunks can make it too.
The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.
Addendum
Mars and its ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod