Table 1
Observational circumstances of comet C/2012 S1 (ISON) during February 2013.
| Date | JD | Images | r h | Δ | α | FWHM |
| [days] | [AU] | [AU] | [deg] | [arcsec] | ||
|
|
||||||
| 2013-Feb.-08 | 2 456 332.47479−2 456 332.58176 | 42 | 4.839 | 4.010 | 6.963 | 4.87 |
| 2013-Feb.-09 | 2 456 333.37477−2 456 333.62491 | 97 | 4.828 | 4.009 | 7.169 | 4.65 |
| 2013-Feb.-11 | 2 456 335.38203−2 456 335.61912 | 68 | 4.806 | 4.008 | 7.587 | 5.30 |
| 2013-Feb.-12 | 2 456 336.40498−2 456 336.50574 | 40 | 4.796 | 4.008 | 7.780 | 5.01 |
| 2013-Feb.-13 | 2 456 337.42286−2 456 337.60275 | 76 | 4.784 | 4.008 | 7.996 | 4.59 |
| 2013-Feb.-14 | 2 456 338.32476−2 456 338.60417 | 79 | 4.773 | 4.008 | 8.188 | 4.14 |
Notes. Date is the date of observation; JD is the first and last Julian dates for each observing night; images is the number of useful images; rh [AU]: heliocentric distance (AU); Δ [AU]: geocentric distance (AU); α [deg]: phase angle (degrees); FWHM: median of the full width at half maximum of the seeing for each observing night (arcsec).
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