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Wide-Field Millimagnitude Photometry with the HAT: A Tool for Extrasolar Planet Detection
We discuss the system requirements for obtaining millimagnitudephotometric precision over a wide field using small-aperture, shortfocal length telescope systems such as those being developed by a numberof research groups to search for transiting extrasolar planets. Wedescribe a Hungarian Automated Telescope (HAT) system, which attempts tomeet these requirements. The attainable precision of HAT has beensignificantly improved by a technique in which the telescope is made toexecute small pointing steps during each exposure so as to broaden theeffective point-spread function (PSF) of the system to a value morecompatible with the pixel size of our CCD detector. Experiments during apreliminary survey (spring 2003) of two star fields with the HAT-5instrument allowed us to optimize the HAT photometric precision usingthis method of PSF broadening; in this way we have been able to achievea precision as good as 2 mmag on brighter stars. We briefly describedevelopment of a network of longitudinally spaced HAT telescopes(HATNet).
| Computer reference stars identification on meteor photographs.
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Observation and Astrometry data
| Constellation: | Hercule |
| Right ascension: | 17h55m00.62s |
| Declination: | +40°26'54.6" |
| Apparent magnitude: | 8.162 |
| Distance: | 181.818 parsecs |
| Proper motion RA: | -0.2 |
| Proper motion Dec: | 2.4 |
| B-T magnitude: | 8.428 |
| V-T magnitude: | 8.184 |
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