Table 1
Log of photometric observations and results from R broadband images.
| Date | r h | Δ | ΔTa | PA | α | Afρ10000 km | m 1 | m 2 | Locationb | ||||
| 2009 | (AU) | (AU) | (days) | (deg) | (deg) | (cm) | |||||||
|
|
|||||||||||||
| January 25 | 1.314 | 1.671 | –34 | 67.8 | 36.1 | 245 | –1.47 | –1.37 | LOT | ||||
| January 30 | 1.294 | 1.670 | –29 | 67.5 | 36.1 | 252 | –1.49 | –1.38 | LOT | ||||
| January 31 | 1.291 | 1.669 | –28 | 67.4 | 36.1 | 250 | –1.49 | –1.49 | LOT | ||||
| February 23 | 1.247 | 1.678 | –5 | 67.5 | 35.9 | 344 | –1.92 | –1.22 | LOT | ||||
| February 25 | 1.247 | 1.680 | –3 | 67.5 | 35.8 | 257 | –1.45 | –1.18 | LOT | ||||
| February 26 | 1.246 | 1.681 | –2 | 67.5 | 35.8 | 373 | –1.54 | –1.18 | LOT | ||||
| March 12 | 1.256 | 1.709 | 12 | 69.2 | 35.1 | 426 | –1.58 | –1.09 | LOT | ||||
| March 19 | 1.269 | 1.732 | 19 | 70.4 | 34.6 | 383 | –1.35 | –1.11 | CA | ||||
Notes. rh and Δ are the heliocentric and geocentric distance of the component during the observations, respectively. PA is the position angle of the extended Sun-target radius vector. α is the phase angle Sun-comet-observer. Afρ values are derived for photometric circular aperture with radius 10 000 km from the comet’s nucleus. Errors on Afρ are of the order of 10% and are mainly due to absolute flux calibration errors. m1: slope of the linear fit log B vs. log ρ for 3.5 ≤ log ρ ≤ 5. Standard deviation of these fits is always lower than 5%. m2: slope of the linear fit log B vs. log ρ for 3.5 ≤ log ρ ≤ 4.4. Standard deviation of these fits is always lower than 5%.
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