im April 2005 lagen 30.000.000 Asteroidenbeobachtungen vor - derer 10% als sog. “single-night” Beobachtungen. Von den verbleibenden ca. 3 Millionen nicht restlos geklärter Einzelbeobachtungen werden 20% als grob fehlerhaft beurteilt.
(siehe untenstehenden Abstract).
Es verbleiben also ca. 2,4 Millionen Einzelbeobachtungen (single night), von denen die große Mehrzahl sicherlich noch Asteroiden zugeordnet werden kann oder die zwischenzeitlich bereits gesichert als Asteroiden identifiziert sind.
Betreffs Cern’s atronomischem Argument sind diejenigen Beobachtungen interessierend, die keine Bewegung des stellaren Objektes aufweisen - setzen wir den Anteil dieser gänzlich unbewegten Objekte auf weniger als 0,1 Prozent, so verbleiben weniger als 2.400 Beobachtungen, deren Ursachen - als besondere Lichterscheinungen - dringlich abschliessend zu prüfen sind.
(Die Koordinaten dieser Objekte sind allesamt bekannt.)
Abstract | Linking and Identifying Hitherto Unidentified Asteroid Observations
As of 7 April 2005, some 10% of the roughly 30,000,000 asteroid observations stored at the Minor Planet Center (MPC) belong to unlinked single-night sets (SNSs), which have not been associated with any known asteroids or comets. Up to 20% of the SNSs are estimated to be bad measurements of known objects, are spurious, or contain gross time/position errors. However, some of the SNSs may actually belong to single objects. When a linkage (that is, an orbit tying different sets of observations together for given observational errors) between two SNSs is found, the increasing observational arc allows a better constrained orbit to be computed, which in turn may reveal additional linkages. When the data of several SNSs are combined, the orbit generally becomes well constrained, effectively constituting the discovery of a new asteroid. So far, the lack of a suitable tool to search for undiscovered linkages has been the main obstacle. We have recently developed a new method to search for linkages between SNSs (Granvik and Muinonen, 2005, Icarus, in press), which is based on a statistical orbital-element inversion method (Virtanen, Muinonen, and Bowell, 2001, Icarus 154, 412-431). Preliminary studies have shown that application of the new method leads to numerous two-night linkages between archived SNSs, and a number of reasonable three-night linkages. We will present results of this ongoing project, as well as estimate the number of objects, particularly NEOs, hidden in the SNS archives.