Open Access
Table 2
Locations, setups and image acquisition parameters of successful observers, and disappearance/reappearance times derived from obtained light curves.
| Observer | Schindler & Wolf | Olsen | Bardecker |
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| Closest city | Alder Springs, CA | Urbana, IL | Gardnerville, NV |
| Latitude N (deg mm ss.ss) | 37 04 13.50 | 40 05 12.40 | 38 53 23.53 |
| Longitude W (deg mm ss.ss) | 119 24 45.00 | 88 11 46.30 | 119 40 20.32 |
| Altitude (m) | 1405 | 224 | 1534 |
| Telescope type | Ritchey-Chrétien | Newtonian | Schmidt-Cassegrain |
| Aperture, focal ratio | 600 mm, f/8 | 500 mm, f/4 | 304 mm, f/3.3 |
| Camera | Andor iXon DU-888E-C00-BV | Watec 120N+ | MallinCam B/W Special |
| Sensor type | Frame transfer EMCCD (e2v CCD201-20, back-illuminated, grade 1) | Interline transfer CCD (Sony ICX418ALL) | Interline transfer CCD (Sony ICX428ALL-A with micro lenses) |
| Sensor cooling (temperaturea) | Thermo-electrical (−80°C) | None (≈−9°C) | None (≈+ 4°C) |
| Frame grabber card | Andor CCI-24 PCIe | Pinnacle DVC-100 | Hauppauge USB-Live2 |
| File format | FITS, uncompressed | Video, uncompressed | Video, Lagarithb codec |
| GPS time logger | Spectrum Instruments TM-4, triggered by electronic shutter of camera | Kiwi Video Time Inserter (VTI), overlaying GPS time stamp on camera frames | IOTA Video Time Inserter (VTI), overlaying GPS time stamp on camera frames |
| Integration time (s) | 2.000 | 4.271 | 2.135 |
| Camera-internal frame accumulation | none | 128 × 1/29.97 | 64 × 1/29.97 |
| Cycle time per frame (s) | 2.00345 | 0.03337 | 0.03337 |
| Disappearance (D) time from square-well fit (UTC) | 10:19:24.356 ± 0.159 | 10:18:05.447 ± 1.032 | 10:19:29.151 ± 0.452 |
| Reappearance (R) time from square-well fit (UTC) | 10:19:50.249 ± 0.159 | 10:18:26.802 ± 1.032 | 10:19:48.370 ± 0.452 |
| Duration of event (s) | 25.893 ± 0.225 | 21.355 ± 1.459 | 19.219 ± 0.639 |
| Chord length (km) | 641.0 ± 3.9 | 525.9 ± 25.4 | 475.7 ± 11.2 |
| SNRc, star & target combined | ≈ 12.6 | ≈ 4.1 | ≈ 4.7 |
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