Bibcode
Vaduvescu, O.; Birlan, M.; Tudorica, A.; Sonka, A.; Pozo, F. N.; Barr, A. D.; Asher, D. J.; Licandro, J.; Ortiz, J. L.; Unda-Sanzana, E.; Popescu, M.; Nedelcu, A.; Dumitru, D.; Toma, R.; Comsa, I.; Vancea, C.; Vidican, D.; Opriseanu, C.; Badescu, T.; Badea, M.; Constantinescu, M.
Referencia bibliográfica
Planetary and Space Science, Volume 59, Issue 13, p. 1632-1646.
Fecha de publicación:
10
2011
Número de citas
13
Número de citas referidas
11
Descripción
We report on the follow-up and recovery of 100 program NEAs, PHAs and
VIs using the ESO/MPG 2.2 m, Swope 1 m and INT 2.5 m telescopes equipped
with large field cameras. The 127 fields observed during 11 nights
covered 29 square degrees. Using these data, we present the incidental
survey work which includes 558 known MBAs and 628 unknown moving objects
mostly consistent with MBAs from which 58 objects became official
discoveries. We planned the runs using six criteria and four servers
which focus mostly on faint and poorly observed objects in need of
confirmation, follow-up and recovery. We followed 62 faint NEAs within
one month after discovery and we recovered 10 faint NEAs having big
uncertainties at their second or later opposition. Using the INT we
eliminated four PHA candidates and VIs. We observed in total 1286 moving
objects and we reported more than 10,000 positions. All data were
reduced by the members of our network in a team effort, and reported
promptly to the MPC. The positions of the program NEAs were published in
27 MPC and MPEC references and used to improve their orbits. The
O-C residuals for known MBAs and program NEAs are smallest for the
ESO/MPG and Swope and about four times larger for the INT whose field is
more distorted. For the astrometric reduction, the UCAC-2 catalog is
recommended instead of USNO-B1. The incidental survey allowed us to
study statistics of the MBA and NEA populations observable today with
1-2 m facilities. We calculate preliminary orbits for all unknown
objects, classifying them as official discoveries, later identifications
and unknown outstanding objects. The orbital elements a, e, i calculated
by FIND_ORB software for the official discoveries and later identified
objects are very similar with the published elements which take into
account longer observational arcs; thus preliminary orbits were used in
statistics for the whole unknown dataset. We present a basic model which
can be used to distinguish between MBAs and potential NEAs in any sky
survey. Based on three evaluation methods, most of our unknown objects
are consistent with MBAs, while up to 16 unknown objects could represent
NEO candidates and four represent our best NEO candidates. We assessed
the observability of the unknown MBA and NEA populations using 1 and 2 m
surveys. Employing a 1 m facility, one can observe today fewer unknown
objects than known MBAs and very few new NEOs. Using a 2 m facility, a
slightly larger number of unknown than known asteroids could be detected
in the main belt. Between 0.1 and 0.8 new NEO candidates per square
degree could be discovered using a 2 m telescope.
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