739 observed NEAs and new 2-4m survey statistics within the EURONEAR network

Ovidiu Vaduvescu 1, 2, 3 Mirel Birlan 1 Alex Tudorica 4, 5 Marcel Popescu 1, 6, 7 François Colas 1 David J. Asher 8 Adrian Sonka 7, 9 Oana Suciu 10, 11 Daniela Adriana Lacatus 12, 13, 14 Alin Razvan Paraschiv 12, 13, 14 Toma Badescu 5 Ovidiu Tercu 14, 15 Alex Dumitriu 14, 15 Aurel Chirila 14, 15 Bringfried Stecklum 16 Javier Licandro 3, 12 Alin Nedelcu 1, 6 Emil Turcu 17 Frédéric Vachier 1 Laurène Beauvalet 1 François Taris 18 Sébastien Bouquillon 18 Francisco Pozo Nuñez 19 Juan Pablo Colque Saavedra 20 Eduardo Unda-Sanzana 19 Mansour Karami 21, 22, 23 Habib G. Khosroshahi 22 R. Toma 8, 11 Hugo Ledo 2, 24 Amy Tyndall 2, 25 L. Patrick 2, 26 Dora Fohring 2, 27 David Muelheims 5 Georg Enzian 5 Dominik Klaes 5 Daniel Lenz 5 Peter Mahlberg 5 Y. Ordenes 5 K. Sendlinger 5
Abstract : We report follow-up observations of 477 program Near-Earth Asteroids (NEAs) using nine telescopes of the EURONEAR network having apertures between 0.3 and 4.2 m. Adding these NEAs to our previous results we now count 739 program NEAs followed-up by the EURONEAR network since 2006. The targets were selected using EURONEAR planning tools focusing on high priority objects. Analyzing the resulting orbital improvements suggests astrometric follow-up is most important days to weeks after discovery, with recovery at a new opposition also valuable. Additionally we observed 40 survey fields spanning three nights covering 11 sq. degrees near opposition, using the Wide Field Camera on the 2.5m Isaac Newton Telescope (INT), resulting in 104 discovered main belt asteroids (MBAs) and another 626 unknown one-night objects. These fields, plus program NEA fields from the INT and from the wide field MOSAIC II camera on the Blanco 4m telescope, generated around 12,000 observations of 2,000 minor planets (mostly MBAs) observed in 34 square degrees. We identify Near Earth Object (NEO) candidates among the unknown (single night) objects using three selection criteria. Testing these criteria on the (known) program NEAs shows the best selection methods are our epsilon-miu model which checks solar elongation and sky motion and the MPC's NEO rating tool. Our new data show that on average 0.5 NEO candidates per square degree should be observable in a 2m-class survey (in agreement with past results), while an average of 2.7 NEO candidates per square degree should be observable in a 4m-class survey (although our Blanco statistics were affected by clouds). At opposition just over 100 MBAs (1.6 unknown to every 1 known) per square degree are detectable to R=22 in a 2m survey based on the INT data, while our two best ecliptic Blanco fields away from opposition lead to 135 MBAs (2 unknown to every 1 known) to R=23.
Type de document :
Pré-publication, Document de travail
Published in Planetary and Space Sciences (Sep 2013). 2013
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Contributeur : Observatoire de Paris Institut de Mécanique Céleste Et de Calcul Des Éphémérides <>
Soumis le : mercredi 28 août 2013 - 15:29:05
Dernière modification le : jeudi 29 novembre 2018 - 15:42:13

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Ovidiu Vaduvescu, Mirel Birlan, Alex Tudorica, Marcel Popescu, François Colas, et al.. 739 observed NEAs and new 2-4m survey statistics within the EURONEAR network. Published in Planetary and Space Sciences (Sep 2013). 2013. 〈hal-00855023〉



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