View Full Version : Apparition of Near Earth Asteroid Eros

2011-Dec-08, 05:39 AM
Near Earth Asteroid 433 Eros will approach to 0.1787 AU (26.7 million km 16.6 million mi) of Earth on 2012 JAN 31 at magnitude +8.5. That will be its closest since 1975 and until 2056. Eros was the first asteroid known to cross the orbit of Mars, and numerical integration suggests it has the potential to become an Earth impactor millions of years in the future. It is the second largest near Earth asteroid and is shoe-shaped with longest dimension of 34 km. In 2000 it became the first asteroid orbited by spacecraft.

Ive created three graphics related to Eros:

1) An ephemeris with both current date and J2000.0 coordinates in decimal format for ease of interpolation.

2) A chart in current date geocentric equatorial coordinates.

3) A chart of Earth and Eros in their orbits as viewed from the north side of the solar system.

These can be seen at www.CurtRenz.com/asteroids

Photos and descriptions of Eros would be welcome additions to this thread. Below are six views of Eros as photographed by a NASA spacecraft.


2012-Jan-23, 10:13 PM
It's only eight days until the unusually close approach of near-Earth asteroid Eros, and eleven until its expected greatest brilliance. I've created three more charts graphing Eros' distance, declination and stellar magnitude. So there are now six Eros graphics on my asteroid webpage. Let's hope we have clear skies next week. Reports should be interesting. www.CurtRenz.com/asteroids

2012-Jan-24, 01:00 PM
You can help to use this close approach by Eros to measure the size of the solar system -- see


(Yes, we already know the answer ... but this is the same method that astronomers used in the 1930s, when they DIDN'T know the answer)

2012-Jan-27, 12:54 AM
And if you have a reallllly good telescope you can see spaceprobe NEAR Shoemaker (http://en.wikipedia.org/wiki/NEAR_Shoemaker) (Wikipedia link) sitting on its surface.