##### ATLAS photometry of 3I/ATLAS, from MJD 60762 through 60916. ##### # # See arXiv2509.05562 v2 for details, accepted by ApJ # # Changes with respect to OLD version at arXiv2509.05562 v1: # 1. StackID labels 60818-60826c and 60817-60828o were swapped # 2. Subsititute H-M phase function for G=0.15 asteroidal phase function # # The columns are # 1. StackID = site/instrument/MJD(/filter) where site is 02,03,04,05 for # Haleakala, South Africa, Chile, Tenerife. A hyphen indicates MJD # range for stacks that span more than ~1 hour # 2. MJD = mean MJD of the difference images that were stacked, aligned # on orbital astrometry not image flux # 3. Filter = o, c, w # AB magnitude system: c~420-650nm, o~560-820nm, w~420-720nm (Tenerife) # (r-o) = -0.022 + 0.282 (c-o) # (V-o) = -0.007 + 0.884 (c-o) # (g-i) = -0.030 + 1.915 (c-o) # (w-g) ~ -0.6(g-r) # 4. N = number of stacked exposures # 5. m2 = AB magnitude in a 2x2" aperture comprising (1) 2" pixel # 6. m6 = AB magnitude in a 6x6" aperture in a 3x3 array of (9) 2" pixels # 7. m10 = AB magnitude in a rounded 10" aperture with 21 pixels from a 5x5 array of (25) 2" pixels less the 4 corner pixels # 8. m14 = AB magnitude in a rounded 14" aperture with 37 pixels from a 7x7 array of (49) 2" pixels less the three corner pixels (total 12) # 9. dm6 = AB magnitude uncertainty of m6. This is 2.5*log of the ratio # of the flux uncertainty to flux. Uncertainties in other apertures # may be scaled from this by the square root of the number of pixels. # 10. r = heliocentric distance [au] # 11. Delta = geocentric distance [au] # 12. sto = Sun-Target-Observer angle [deg] # 13. Phi(sto) = Halley-Marcus phase function for comets assembled by # D. Schleicher (https://asteroid.lowell.edu/comet/dustphase) # # StackID MJD Filt N m2 m6 m10 m14 dm6 r Delta sto Phi 60760-60764o 60762.4563 o 12 24.14 23.74 21.71 21.06 1.88 7.705 7.840 7.29 0.30 60762-60766c 60764.7003 c 12 23.39 22.49 22.78 22.78 0.57 7.628 7.725 7.42 0.31 60791-60792c 60791.5831 c 8 23.27 22.16 21.76 21.94 0.43 6.718 6.340 8.20 0.34 60786-60798o 60792.5380 o 29 23.70 21.61 21.96 21.86 0.19 6.685 6.292 8.17 0.34 60817-60828o 60821.2754 o 17 22.73 20.63 20.14 19.90 0.07 5.714 4.897 6.43 0.27 60818-60826c 60823.0204 c 17 22.83 21.29 20.86 21.25 0.17 5.655 4.818 6.22 0.26 04a60843 60843.2952 o 4 20.98 19.43 18.92 18.81 0.08 4.973 3.976 2.55 0.11 05r60845 60845.0836 w 4 20.86 19.31 18.81 18.66 0.05 4.913 3.910 2.14 0.09 05r60848 60848.0824 w 4 20.88 19.13 18.86 18.76 0.04 4.812 3.802 1.47 0.07 04a60850 60850.4007 o 4 20.47 18.62 18.23 18.09 0.04 4.735 3.722 1.09 0.05 05r60851 60851.0416 w 3 21.12 19.18 18.70 18.52 0.04 4.714 3.700 1.03 0.05 03a60851 60851.0812 c 5 21.72 19.65 19.06 18.73 0.06 4.712 3.698 1.03 0.05 04a60853 60853.2509 o 4 20.26 18.31 17.86 17.80 0.05 4.640 3.626 1.10 0.05 02a60854 60854.4585 c 4 21.11 19.12 18.61 18.47 0.05 4.599 3.587 1.30 0.06 05r60855 60855.0381 w 4 20.45 18.57 18.17 17.98 0.03 4.580 3.569 1.42 0.06 03a60856 60855.9503 c 4 21.02 19.03 18.52 18.31 0.02 4.550 3.540 1.64 0.07 04a60857 60857.2336 o 4 20.10 18.34 17.97 17.84 0.02 4.507 3.500 1.99 0.09 05r60858 60858.0347 w 4 20.28 18.50 18.23 18.16 0.02 4.480 3.475 2.23 0.10 04a60858 60858.2348 o 4 20.45 18.45 17.95 17.78 0.04 4.473 3.469 2.30 0.10 03a60859 60858.9859 c 4 20.72 18.81 18.35 18.20 0.02 4.449 3.447 2.53 0.11 04a2300 60860.9796 o 18 20.24 18.32 17.92 17.73 0.02 4.382 3.388 3.18 0.14 05r60861 60861.0135 w 4 20.31 18.47 18.06 17.98 0.03 4.381 3.387 3.19 0.14 04a0000 60861.0213 o 21 20.15 18.27 17.83 17.69 0.02 4.381 3.387 3.19 0.14 04a0100 60861.0620 o 18 20.14 18.29 17.85 17.72 0.02 4.379 3.386 3.21 0.14 04a0200 60861.1044 o 16 20.21 18.27 17.87 17.75 0.02 4.378 3.384 3.22 0.14 04a0300 60861.1450 o 17 20.25 18.30 17.87 17.72 0.02 4.377 3.383 3.23 0.14 04a0400 60861.1875 o 18 20.20 18.24 17.82 17.65 0.02 4.375 3.382 3.25 0.14 04a0500 60861.2296 o 16 20.21 18.28 17.85 17.72 0.02 4.374 3.381 3.26 0.14 04a0600 60861.2717 o 14 20.26 18.34 17.87 17.69 0.02 4.372 3.380 3.28 0.14 02a0600 60861.2733 o 19 20.12 18.29 17.87 17.68 0.02 4.372 3.380 3.28 0.14 02a0700 60861.3128 o 23 20.27 18.31 17.91 17.76 0.01 4.371 3.378 3.29 0.14 04a0700 60861.3128 o 14 20.25 18.37 17.93 17.80 0.02 4.371 3.378 3.29 0.14 04a0800 60861.3508 o 12 20.22 18.38 17.88 17.64 0.03 4.370 3.377 3.30 0.14 02a0800 60861.3556 o 25 20.27 18.34 17.91 17.76 0.01 4.369 3.377 3.31 0.14 02a0900 60861.3953 o 24 20.30 18.36 17.94 17.79 0.01 4.368 3.376 3.32 0.14 02a1000 60861.4382 o 22 20.31 18.34 17.89 17.73 0.02 4.367 3.375 3.33 0.14 02a1100 60861.4789 o 20 20.22 18.39 17.93 17.72 0.02 4.365 3.374 3.35 0.15 02a1200 60861.5204 o 17 20.41 18.40 17.91 17.73 0.02 4.364 3.373 3.36 0.15 04a60862 60862.1202 o 4 20.37 18.42 17.84 17.62 0.03 4.344 3.355 3.57 0.16 05r60868 60868.0385 w 4 19.77 17.99 17.68 17.57 0.04 4.148 3.199 5.72 0.24 04a60868 60868.1667 o 4 20.00 18.14 17.64 17.54 0.04 4.143 3.195 5.78 0.25 03a60869 60868.9227 o 4 20.10 18.08 17.57 17.38 0.05 4.119 3.177 6.06 0.26 04a60869 60869.2095 o 4 19.95 18.08 17.60 17.43 0.03 4.109 3.170 6.17 0.26 04a60870 60870.1940 o 7 19.91 18.05 17.62 17.39 0.03 4.076 3.146 6.56 0.28 05r60871 60870.9906 w 4 20.23 18.32 17.90 17.72 0.02 4.050 3.127 6.87 0.29 03a60871 60871.0092 o 7 20.08 18.19 17.78 17.63 0.03 4.049 3.127 6.88 0.29 03a60872 60872.0120 o 7 19.90 18.07 17.62 17.39 0.02 4.016 3.104 7.27 0.30 03a60873 60872.8108 o 2 19.95 18.07 17.64 17.46 0.02 3.990 3.086 7.58 0.32 05r60874 60873.9749 w 4 20.28 18.34 17.85 17.63 0.02 3.951 3.060 8.06 0.33 04a60874 60874.1477 c 4 20.17 18.26 17.84 17.67 0.02 3.945 3.056 8.13 0.34 03a60875 60874.8838 o 4 19.92 17.94 17.49 17.29 0.01 3.922 3.041 8.42 0.35 03a60876 60875.8850 o 5 19.98 17.89 17.35 17.15 0.02 3.888 3.020 8.83 0.36 03a60877 60876.7542 o 2 19.77 17.80 17.26 17.06 0.02 3.860 3.002 9.18 0.38 05r60877 60876.9726 w 4 19.77 17.92 17.55 17.37 0.01 3.852 2.998 9.28 0.38 04a60877 60877.1447 c 4 19.98 18.11 17.65 17.44 0.03 3.847 2.995 9.34 0.38 04a60878 60878.1331 c 4 20.06 18.09 17.64 17.48 0.02 3.814 2.975 9.75 0.40 03a60880 60879.9488 o 4 19.58 17.66 17.19 17.02 0.01 3.755 2.941 10.50 0.42 05r60880 60879.9681 w 4 20.30 18.22 17.68 17.44 0.01 3.754 2.941 10.51 0.42 04a60881 60881.1325 c 4 19.82 17.93 17.50 17.32 0.01 3.716 2.920 10.99 0.44 03a60883 60882.8439 o 4 19.46 17.53 17.06 16.88 0.01 3.660 2.890 11.70 0.47 05r60883 60882.9651 w 8 20.06 18.06 17.52 17.28 0.01 3.656 2.888 11.75 0.47 03a60884 60883.8467 o 4 19.43 17.47 17.01 16.83 0.01 3.627 2.874 12.11 0.48 04a60885 60885.0847 c 4 19.71 17.84 17.42 17.21 0.01 3.587 2.854 12.62 0.50 05r60886 60885.9606 w 4 19.44 17.63 17.24 17.10 0.01 3.558 2.841 12.98 0.51 02a60886 60886.3258 o 4 19.29 17.33 16.85 16.67 0.01 3.546 2.835 13.13 0.51 05r60889 60888.9049 w 4 19.66 17.72 17.19 16.98 0.01 3.462 2.799 14.17 0.55 04a60894 60894.1118 o 4 19.00 17.08 16.58 16.33 0.03 3.294 2.735 16.21 0.61 03a60895 60894.8868 o 4 19.02 17.07 16.49 16.35 0.03 3.269 2.727 16.50 0.62 05r60896 60895.9044 w 4 19.19 17.29 16.76 16.61 0.03 3.236 2.716 16.88 0.63 05r60900 60899.8984 w 4 19.14 17.20 16.74 16.57 0.01 3.109 2.679 18.30 0.68 03a60905 60904.8024 o 4 18.84 16.80 16.26 16.03 0.01 2.953 2.642 19.86 0.72 05r60908 60907.8897 w 4 18.96 16.97 16.47 16.28 0.01 2.856 2.623 20.73 0.74 04a60914 60914.0567 o 4 18.44 16.40 15.88 15.65 0.01 2.666 2.593 22.11 0.78 02a60916 60916.2574 o 4 18.36 16.34 15.83 15.59 0.01 2.599 2.585 22.48 0.79 03a60917 60916.7302 o 4 18.41 16.37 15.82 15.59 0.01 2.584 2.583 22.55 0.79