Close asteroid pass today
Posted: 23.02.2006, 07:14
Just as a curiosity, with todays better asteroid search programs I think I can see more small objects discovered and reported on the net, that come in the vicinity of Earth. Usually they are too small to pose any big danger even if they were on an impact course, but sometimes they come pretty close! Here is one I discovered on todays list maintained by the JPL NEO program of close approaches:
http://neo.jpl.nasa.gov/ca/
called 2006 DD1. It comes to within 0.3 Lunar Orbits so I think it shoud even be visible with a good telescope? But the speed of these things probably makes them not easy to observe, unless you have the accurate ephemeris data and computer tracking? I wouldn't know really...
Here are the Celestia orbital elements from http://neo.jpl.nasa.gov/cgi-bin/db_shm?sstr=2006%20DD1 , the period I computed from the semi-major axis to give a litle more accuracy but 3.279 is probably as accurate as it gets.. I have not yet checked the elements runing in the Celestia program. But I think it should work, just copy the code as a text file in 'Extras'. After today the elliptical orbit is not very useful anymore because gravitational effects altered it.
Regards, Eelco
http://neo.jpl.nasa.gov/ca/
called 2006 DD1. It comes to within 0.3 Lunar Orbits so I think it shoud even be visible with a good telescope? But the speed of these things probably makes them not easy to observe, unless you have the accurate ephemeris data and computer tracking? I wouldn't know really...
Here are the Celestia orbital elements from http://neo.jpl.nasa.gov/cgi-bin/db_shm?sstr=2006%20DD1 , the period I computed from the semi-major axis to give a litle more accuracy but 3.279 is probably as accurate as it gets.. I have not yet checked the elements runing in the Celestia program. But I think it should work, just copy the code as a text file in 'Extras'. After today the elliptical orbit is not very useful anymore because gravitational effects altered it.
Code: Select all
# with JPL data, solution JPL#1
# period recalculated from value
# JPL semimajoraxis with formula for two-body problem
# from Sir Isaac Newton ref
# http://en.wikipedia.org/wiki/Semi-major_axis
# http://en.wikipedia.org/wiki/Standard_gravitational_parameter
# using a sidereal year of 365.25636042 mean solar days
# and using 1 AU = 1.49597870691 x 10^11 (?± 3) m
# Asteroid (2006 DD1)
# Record: 604077 SPK-ID: 3323939
# Alternate Designation: none
# OSCULATING ORBITAL ELEMENTS
# (heliocentric ecliptic J2000)
# Solution ID = JPL#1
# Epoch = 2006-02-22.0 (2453788.5) TDB
"(2006 DD1) " "Sol"
{
Class "asteroid"
Mesh "asteroid.cms"
Texture "asteroid.jpg"
Radius 0.01 # no data but guess made from H = 26.50
EllipticalOrbit
{
Epoch 2453788.5
Period 3.27948189030614 # Not all digits will be accurate
SemiMajorAxis 2.20734253245919
Eccentricity 0.650018718584586
Inclination 8.98362282557982
AscendingNode 154.180189443528
ArgOfPericenter 63.9179846152614
MeanAnomaly 347.381365422583
}
Albedo 0.7 # fiction, large because we want it visible!!!
RotationPeriod 4 # (hours) random choice
}
Regards, Eelco