Due to server maintainance work the NEA Database at EARN (earn.dlr.de/nea) is currently not accessible. We hope solve this problem as soon as possible. Sorry...
Gerhard Hahn
Gerhard.Hahn@...
Feb 1, 2005 9:08 am
14158
The DLR Database on physical properties of NEAs at earn.dlr.de/nea is now up again and accessible. Sorry for the inconvenience during the downtime. ...
Gerhard Hahn
Gerhard.Hahn@...
Feb 2, 2005 9:14 am
14159
Active astrometric sites. Using the site residuals report that the MPC prepared on 28 Jan. 05 eliminating duplicate entries for those sites which have...
Had great weather and it has been awhile that we could get some astrometry going but when we went to get targets we found 1. MPC critical list has not been...
http://neo.jpl.nasa.gov/news/news149.html Radar Observations Refine the Future Motion of Asteroid 2004 MN4 Paul Chodas, Steve Chesley, Jon Giorgini and Don...
Ron Baalke
baalke@...
Feb 4, 2005 12:55 am
14162
http://neo.jpl.nasa.gov/orbits/deepimpact.html Observe the Deep Impact Spacecraft Close In On Comet Tempel 1 Don Yeomans and Ron Baalke NASA's Near Earth...
Ron Baalke
baalke@...
Feb 4, 2005 12:58 am
14163
Hi all, I'm deep into an effort to establish a public astronomy facility in the Western St. Louis Metropolitan area. The best land deal I can work out is...
Hello, this message of a german computer magazine was just released: http://www.heise.de/newsticker/meldung/55992 It says that 2004 MN4 will pass the earth at...
Hi: Adam Stuart here, from Miami, Florida (USA). I caught the minor planet bug a few months ago as I got tired of competing with the weather, holding out for...
... Bernd, Thanks for pointing out the updated prediction. NeoDys indicates that at its brightest, 2004 MN4 will reach V=2.91 as seen from La Palma, V=3.01 as...
http://www.lowell.edu/press_room/releases/recent_releases/PL_75_rls.html Lowell Observatory For Immediate Release February 3, 2005 contact: Steele Wotkyns ...
Ron Baalke
baalke@...
Feb 4, 2005 11:02 pm
14169
The news statement at http://neo.jpl.nasa.gov/news/news149.html states: "The passage of the asteroid by the Earth in 2029 alters its subsequent trajectory and...
I realize a lunar impact is not possible... my question should have been, considering the various uncertainties, just how close might the asteroid come to the...
... Quoting that news statement: ] Even so, the asteroid's uncertainty region is not large enough to ] extend to the moon as it passes by, and so a lunar...
Dave Tholen
tholen@...
Feb 5, 2005 7:39 am
14172
... It passes through the orbital plane. Perigee occurs at the ascending node....
Dave Tholen
tholen@...
Feb 5, 2005 7:41 am
14173
Fellow MPMLers following the 2004 MN4 saga, I have reviewed and re-analyzed my observations of 2004 MN4 on the 4 dates that are supported by Tycho star...
... considering the various uncertainties, just how close might the asteroid come to the moon (in kilometers)? 96,000 in 2029. Ireneusz Wlodarczyk, 553 Chorzow...
Ireneusz Wlodarczyk
astrobit@...
Feb 5, 2005 11:11 am
14175
... Cary, the geo sateliites are in a ring around the equator of the Earth. If you run a geocentric ephemeris for April 13, 2029 for 2004 MN4 on HORIZON at JPL...
... The same equations are given in "Astronomical Algorithms" by J. Meeus but it is noted that they are valid only for 0° <= phaseangle <= 120° even though...
"Astronomical Algorithms" (Second Edition) by J. Meeus gives this equation for the phase angle: cos(beta) = (r^2 + delta^2 - R^2)/(2*r*delta) r = heliocentric...
Hi Reiner, The shift from the geocenter to a topocentric position is simple enough: just treat R as being the distance from observer to the Sun and delta as...
... Okay, I see that above equation is just easily derived from the law of cosines. So the topocentric phase angle should be calculated by using the triangle...
Bill, ... What about (90377)'s moon? I noticed that using R as 1 AU together with the topocentric distance will not work, resulting in a cosine of >1 or <-1...
In the original fitting of data to define the H-G system, we had data for high and low albedo objects only out to around 120-140 degrees. Our most extreme...
Congratulations to 106 Crni Vrh Two Neo discoveries in two days!! 2005 CR37 a,e,i = 1.91, 0.47, 26 q = 1.0139 H 19.1 Observer H. Mikuz 2005 CC37 a,e,i =...
Charles W. Juels
cwjuels@...
Feb 8, 2005 8:30 pm
14184
Hi Reiner, ... That's just the case where the change in distance is greatest: you are one Earth radius closer to the object than somebody at the geocenter...
... To determine the size of the error, one would need to compare theory with observation. Anybody know of any photometric measurements of asteroids at phase...
Dave Tholen
tholen@...
Feb 8, 2005 10:18 pm
14187
... In the process of computing a topocentric ephemeris, you need to move one vertex of the triangle from the geocenter to the topocenter. The phase angle...
