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Table 1

Summary of all RefPlanets observations completed until the end of 2018.

Date (UT) Object mR Filters DIT # of Seeing τ0 Air mass Field

(sec) pol. (′′) (ms) rotation
(mag) cam1 cam2 cycles (°)
2015/05/01 α Cen A −0.5 N_I N_R 1.2 66 2 h 38.4 min 0.6–1.0 1.7–2.5 1.24–1.47 90.4
2015/05/02 α Cen B 1.0 VBB R_PRIM 1.2 90 3 h 36 min 0.6–1.1 1.5–2.2 1.24–1.46 97.1
2016/02/17 Sirius A −1.5 N_I N_I 1.2 34 1 h 21.6 min 0.7–2.0 1.6–2.5 1.01–1.13 101.1
2016/02/20 Sirius A −1.5 N_I N_I 1.2 73 2 h 55.2 min 1.0–2.0 1.8–3.5 1.01–1.39 113.2
2016/04/18 α Cen A −0.5 N_R N_R 1.2 40 1 h 36 min 1.1–1.5 1.8–2.4 1.26–1.48 46.7
2016/04/21 α Cen A −0.5 N_R N_R 1.2 80 3 h 12 min 0.7–1.7 2.0–4.0 1.24–1.71 107.9
2016/06/22 α Cen B 1.0 VBB VBB 1.1 74 2 h 42.8 min 0.3–0.8 3.5–6.0 1.24–1.60 106.6
2016/07/21 Altair 0.6 R_PRIM R_PRIM 1.2 63 2 h 31.2 min 0.4–0.8 4.5–7.0 1.20–1.44 67.2
2016/07/22 Altair 0.6 R_PRIM R_PRIM 1.2 30 1 h 12 min 0.4–0.7 3.0–5.0 1.20–1.32 27.6
2016/10/10 ɛ Eri 3.0 VBB VBB 3.0 42 2 h 48 min 0.5–0.8 4.5–6.7 1.05–1.37 0(b)
2016/10/11 ɛ Eri 3.0 VBB VBB 3.0 48 3 h 12 min 0.5–0.8 3.3–6.5 1.04–1.18 0(b)
2016/10/12 ɛ Eri 3.0 VBB VBB 5.0 15 1 h 40 min 1.0–1.8 1.8–2.1 1.04–1.21 0(b)
2017/04/30 α Cen A −0.5 N_R N_R 1.2 84 3 h 21.6 min 0.5–0.7 3.0–4.4 1.24–2.21 121.5
2017/05/01 α Cen A −0.5 N_R N_R 1.2 39 1 h 33.6 min 0.8–1.3 2.0–2.5 1.37–1.84 47.8
2017/06/19 α Cen B 1.0 VBB VBB 1.1 141 3 h 26.8 min 0.3–1.0 4.5–9.5 1.24–1.52 115.6
2018/10/14 τ Ceti 2.9 R_PRIM R_PRIM 14 30 2 h 48 min 0.4–0.7 5.0–10 1.01–1.12 130.5
2018/10/15 τ Ceti 2.9 R_PRIM R_PRIM 14 24 2 h 14.4 min 0.6–1.6 2.0–4.0 1.01–1.12 112.1
2018/10/16 τ Ceti 2.9 R_PRIM R_PRIM 14 32 2 h 59 min 0.6–1.0 2.5–3.7 1.01–1.28 104.9
2018/10/19 τ Ceti 2.9 R_PRIM R_PRIM 14 29 2 h 42.4 min 0.6–1.4 2.6–5.3 1.01–1.60 107.5

Notes. For each observation we also list observing conditions (seeing in arc seconds and coherence time τ0 in ms) and the total field rotation (relevant for the efficiency of angular differential imaging). The datasets with the deepest limits for each target are marked in bold font. (a) The total exposure time per camera. (b) ɛ Eri was observed in the field-stabilised ZIMPOL P2-polarimetry mode.

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