This is an archive issue of Tumbling Stone. Click here for current issue

Number 12:12/03/2002
A scientific publication by SGF and NEODyS


Didn’t we say that….?
We wrote in the past few days that the record number of accesses to TS was surely due to 2002EM7, an asteroid that has passed very close to us, raising the media fever even if it did not have a single chance to hit the Earth, and even if it was too small to cause any damage anyway. If the media had checked it with the appropriate source (NEODyS risk page and Sentry Risk page) they could have cooled off their ardour…and they could have discovered that, actually, there is an other object, half a mile long (1 Km) that is quite more interesting : it has 1 probability on 9300 to impact in 2049.
Read the articles here, on Tumbling Stone and stay tuned with us!
Nanni Riccobono - Editor of T.S.
Special about asteroid 2002 CU11

The problem with 2002 CU11
by Andrea Milani, Giovanni Valsecchi and Maria Eugenia Sansaturio
The asteroid 2002 CU11 was discovered on 7 February 2002; after the data were made public by the MPC, the CLOMON software robot monitored it and since 14 February identified it as a possible impactor; this information was posted on the "risk page" of the Near Earth Objects Dynamic Site (NEODyS)... 
A scientific breakthrough
by Andrea Milani, Giovanni Valsecchi and Maria Eugenia Sansaturio
To put the detection of the 2002 CU11 impact possibility in context,we need some historical perspective...

Sentry: a monitoring system from NASA to web
by Livia Giacomini

Tumbling News
Yucatan: about Chicxulub's secrets by Nanni Riccobono
ESA call for missions to NEOs by Ettore Perozzi
Special about the newly discovered comet
Comet Ikeya-Zhang: a new visitor by Livia Giacomini
A comet's physical characteristics and orbital elements
How do you determine the orbit of a comet?
Other articles
Back To Ptolemy? Why not, if it is useful
by Giovanni Valsecchi - Director of SCN
Survey: Space missions about NEOs
People looking for NEOs
Spaceguard UK - A saga (part II)
by Jay Tate - President of Spaceguard UK

Italian version

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Editor: Nanni Riccobono
Assistant Editor and web design: Livia Giacomini (
Collaborators of this issue: Andrea Boattini, Germano D'Abramo, Ettore Perozzi, Jay Tate, Giovanni Valsecchi and Maria Eugenia Sansaturio
Spaceguard Foundation (SGF) is a private, non profit scientific organization aimed at supporting and co-ordinating NEO researches in the world.
NEO Dynamic Site (NEODyS) is a service offered by the University of Pisa (Italy). It provides catalogues, computation of orbits, and projection of the behavior of NEOs in the future, in order to identify possible impacts in advance.

Images of the heading: courtesy of NASA
Image of asteroid and earth: lagia
Image of comet Ikeya-Zhang: by
Larry Koehn