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Table 2

GEM 2.3GHz survey.

Description Colombia Brazil

Observational site Villa de Leyva Cachoeira Paulista
Longitude (WGS84) −73°35′0.53″ −44°59′54.34′
Latitude (WGS84) +5°37′7.84″ −22°41′0.74″
Altitude (m.a.s.l.) 2173 572
Observing runs 1995-Jun-1–18 1999-May-18–Jun-17
1999-Oct-11–26
Antenna mounting altazimuthal altazimuthal
Azimuth scanning speed (rpm) 0.99632 ± 0.00036 1.00290 ± 0.00063
Sky coverage (%) 46.3 46.8
Pointing accuracy
Center frequency (MHz) 2300 2300
Pre-detection BW (MHz) 100 100
Gain (K V-1) 54.675 50.928
Gain susceptability (K-1) −0.02381 ± 0.00028 −0.02164 ± 0.00006
System temperature (K) 85.466 61.644
RMS sensitivity (mK) 11.42 8.24
RF plate Tcal (K) 310.572 308.031
Horizontal HPBW (°) 2.30 ± 0.13 2.31 ± 0.03
Vertical HPBW (°) 1.92 ± 0.18 1.82 ± 0.12
Beam efficiency (%) 75.0 ± 3.5 75.0 ± 3.5
Aperture efficiency (%) 38.0 39.9
PSS (Jy K-1) 306 291

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