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Table 1

Observing geometries (Herschel-centric) and final calibrated flux densities (FD).

Julian date λref FD FDerr rhelio Δobs α OD/OBSID Repetitions Duration
mid-time [μm] [mJy] [mJy] [AU] [AU] [deg] [s]
first visita on Jan. 6, 2013:
2 456 298.50745 70.0 36.3 1.1 1.03593 0.096247 +60.44 1333/1342258557 1–6 1928
2 456 298.50745 160.0 8.7 3.3 1.03593 0.096247 +60.44 1333/1342258557 1–6 1928
2 456 298.53059 100.0 22.8 1.7 1.03599 0.096234 +60.40 1333/1342258558 1–7 2012
2 456 298.53059 160.0 7.4 3.8 1.03599 0.096234 +60.40 1333/1342258558 1–7 2012
2 456 298.55258 70.0 37.5 1.3 1.03604 0.096221 +60.36 1333/1342258559 1–6 1730
2 456 298.55258 160.0 9.8 2.5 1.03604 0.096221 +60.36 1333/1342258559 1–6 1730
2 456 298.57455 100.0 25.0 1.5 1.03609 0.096208 +60.32 1333/1342258560 1–7 2012
2 456 298.57455 160.0 8.2 2.2 1.03609 0.096208 +60.32 1333/1342258560 1–7 2012
combined first visit:
2 456 298.53194 70.0 36.08 0.92 1.03599 0.096233 +60.40 1342258557 + 59 all 3658
2 456 298.55394 100.0 22.56 1.17 1.03604 0.096220 +60.36 1342258558 + 60 all 4024
2 456 298.54375 160.0 9.41 1.29 1.03602 0.096226 +60.37 1342258557 ... 60 all 7682
second visitb on Mar. 14, 2013:
2 456 365.77802 70.0 12.6c 2.7 1.093010 0.232276 –61.38 1400/1342267456 1–3 828
2 456 365.78760 70.0 11.4 2.7 1.093003 0.232307 –61.38 1400/1342267456 4–6 828
2 456 365.79719 70.0 10.4 2.7 1.092996 0.232338 –61.39 1400/1342267456 7–9 828
2 456 365.80677 70.0 12.5c 2.6 1.092989 0.232368 –61.39 1400/1342267456 10–12 828
2 456 365.81635 70.0 13.3c 2.7 1.092983 0.232397 –61.40 1400/1342267456 13–15 828
2 456 365.82594 70.0 12.4 2.6 1.092976 0.232427 –61.40 1400/1342267456 16–18 828
combined second visit:
2 456 365.80198 70.0 11.20 1.41 1.09299 0.232352 –61.39 1400/1342267456 selected 2484
2 456 365.80198 160.0 <3.2 – 1.09299 0.232352 –61.39 1400/1342267456 all 4968

Notes. rhelio is the heliocentric distance, Δobs the object distance from Herschel, and α is the phase-angle, with negative values after opposition. OD is the Herschel operational day, OBSID: Herschel observation identifier. The repetitions specify the number of scan-maps performed and/or used to derived the given flux and error. The Herschel-centric apparent motions of Apophis were 205′′/h (first visit in January 2013) and 58′′/h (second visit in March 2013).

(a)

Light-travel time is 48.0 s;

(b)

light-travel time is 115.9 s;

(c)

Photometry is still affected by 1–2 mJy residuals from the background-elimination process, not used for the final photometry on the combined measurement.

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