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Table 1

Details of our AMBER observations of Betelgeuse.

# Name Mode t obs Stations B p PA Seeing (′′) τ 0 DIT Number
(UTC) (m) (°) (Visible) (ms) (ms) of frames
2011 January 01
Cal HR-1543 MR_K 00:50 E0-G0-H0 37.98/12.67/25.31 73.62/73.62/73.62 0.99 3.50 0.5 11*120
Cal HR-2508 MR_K 02:28 E0-G0-H0 25.89/12.95/38.85 61.01/60.99/61.01 1.13 3.03 0.5 11*120
1 Betelgeuse MR_K 03:17 E0-G0-H0 30.39/15.20/45.59 74.28/74.27/74.27 1.02 3.35 0.5 5*120
2 Betelgeuse MR_K 03:29 E0-G0-H0 30.89/15.45/46.34 74.12/74.11/74.12 1.19 2.85 0.187 5*120
Cal HR-2508 MR_K 03:51 E0-G0-H0 30.46/15.24/45.70 68.59/68.58/68.59 1.14 2.97 0.187 2*1000
Cal HR-2508 MR_K 04:03 E0-G0-H0 30.99/15.51/46.50 69.55/69.53/69.55 1.08 3.14 0.187 10*100
11 Betelgeuse MR_K 04:21 E0-G0-H0 31.95/15.99/47.94 73.01/73.00/73.01 1.10 3.09 0.187 10*100
Cal HR-2508 MR_K 04:35 E0-G0-H0 31.75/15.89/47.64 71.28/71.26/71.28 0.83 4.06 0.187 10*100
4 Betelgeuse MR_K 04:51 E0-G0-H0 31.90/15.96/47.86 72.03/72.01/72.02 0.77 4.40 0.187 10*100
Cal HR-2508 MR_K 05:06 E0-G0-H0 31.99/16.01/48.00 72.63/72.61/72.62 0.75 4.48 0.187 10*100
5 Betelgeuse MR_K 05:28 E0-G0-H0 31.19/15.61/46.79 70.40/70.39/70.40 0.90 3.74 0.187 3*200
6 Betelgeuse MR_K 05:33 E0-G0-H0 31.02/15.52/46.54 70.12/70.11/70.12 0.89 3.77 0.187 9*100
Cal HR-2469 MR_K 05:51 E0-G0-H0 31.23/15.63/46.86 74.28/74.27/74.28 0.84 3.84 0.187 11*100
Cal HR-2469 MR_K 06:35 E0-G0-I1 58.57/48.00/14.75 114.06/125.21/75.10 0.78 4.12 0.187 8*100
Cal HR-3950 MR_K 07:21 E0-G0-I1 68.79/56.25/15.19 105.10/113.00/74.47 1.16 2.73 0.187 10*100
Cal HR-3950 MR_K 08:14 E0-G0-I1 66.95/53.79/15.93 103.62/112.20/73.38 0.91 3.42 0.187 22*100
2011 January 02
Cal HR-1543 MR_K 01:50 E0-G0-I1 56.52/14.83/68.64 113.51/74.22/105.65 1.24 2.30 0.5 10*100
7 Betelgeuse MR_K 02:14 E0-G0-I1 56.02/13.54/66.86 115.08/74.30/107.48 1.0 2.86 0.5 10*100
8 Betelgeuse MR_K 02:29 E0-G0-I1 56.38/14.07/67.76 114.40/74.41/106.74 1.12 2.54 0.187 10*100
Cal HR-2275 MR_K 02:55 E0-G0-I1 55.96/14.50/67.17 113.34/69.46/104.74 0.98 2.29 0.187 10*100
Cal HR-2275 MR_K 03:05 E0-G0-I1 56.23/14.76/67.72 113.35/69.96/104.74 0.98 2.89 0.5 6*100
9 Betelgeuse MR_K 03:39 E0-G0-I1 55.37/15.67/68.31 112.58/73.89/104.34 0.79 3.59 0.5 5*100
Cal HR-2275 MR_K 04:02 E0-G0-I1 56.10/15.80/68.64 114.15/72.04/105.27 0.92 3.10 0.5 7*100
10 Betelgeuse MR_K 04:22 E0-G0-I1 52.55/16.00/65.68 112.42/72.84/103.49 0.79 3.59 0.5 5*100
Cal HR-2275 MR_K 04:45 E0-G0-I1 54.09/16.00/66.72 115.67/72.83/106.29 0.98 2.91 0.5 6*100
11 Betelgeuse MR_K 05:19 E0-G0-H0 31.29/15.66/46.94 70.58/70.57/70.58 1.19 2.39 0.5 5*100
Cal HR-2275 MR_K 05:36 E0-G0-H0 31.12/15.57/46.69 73.03/73.01/73.02 1.23 2.44 0.5 5*100
12 Betelgeuse MR_K 05:52 E0-G0-H0 30.14/15.08/45.23 68.75/68.74/68.74 1.09 2.76 0.5 5*120
Cal HR-2275 MR_K 06:21 E0-G0-H0 29.19/14.61/43.80 72.47/72.46/72.46 1.14 2.68 0.5 10*120
Cal HR-3950 MR_K 07:44 E0-G0-H0 15.67/31.32/46.99 74.00/74.01/74.00 1.18 2.75 0.5 6*120
Cal HR-2508 MR_K 08:01 E0-G0-H0 11.67/23.32/34.99 74.81/74.83/74.82 0.99 3.30 0.5 20*100
Cal HR-1543 MR_K 01:03 E0-G0-I1 66.73/55.95/13.51 107.44/115.08/74.01 0.99 4.02 0.5 5*100
Cal HR-1543 MR_K 01:17 E0-G0-I1 67.58/56.31/13.99 106.79/114.49/74.16 0.86 4.62 0.5 5*100
13 Betelgeuse MR_K 01:33 E0-G0-I1 63.68/54.36/12.09 109.60/117.10/73.61 0.86 4.58 0.5 5*100
Cal HR-2508 MR_K 01:49 E0-G0-I1 55.95/48.40/11.82 102.08/112.10/56.6 0.85 4.61 0.5 5*100
14 Betelgeuse MR_K 02:05 E0-G0-I1 66.51/55.86/13.36 107.73/115.32/74.24 0.63 6.24 0.5 5*100
Cal HR-2275 MR_K 02:19 E0-G0-I1 64.49/54.43/13.48 104.93/113.61/67.38 0.70 5.63 0.5 5*120
15 Betelgeuse MR_K 02:33 E0-G0-I1 68.12/56.49/14.31 106.39/114.10/74.43 0.63 6.17 0.5 5*120
Cal HR-2508 MR_K 03:03 G0-H0-I1 40.77/54.79/28.65 142.77/112.12/65.62 0.63 6.15 0.5 6*100
16 Betelgeuse MR_K 03:20 G0-H0-I1 37.24/55.95/30.85 143.99/112.81/74.14 0.69 5.61 0.5 5*120
Cal HR-2275 MR_K 03:34 G0-H0-I1 39.57/56.51/30.91 145.38/113.65/71.34 0.65 6.00 0.5 5*120
17 Betelgeuse MR_K 03:50 G0-H0-I1 35.91/54.59/31.66 146.00/112.44/73.60 0.74 5.22 0.5 5*100
Cal HR-2275 MR_K 04:02 G0-H0-I1 38.80/55.97/31.66 147.43/114.26/72.16 0.89 4.30 0.5 5*100
Cal HR-2275 MR_H 04:21 G0-H0-I1 38.23/55.23/31.92 149.05/114.85/72.55 1.14 3.38 0.5 5*100
18 Betelgeuse MR_H 04:43 G0-H0-I1 33.35/50.28/31.90 151.23/112.68/72.03 0.92 4.16 0.5 6*100
Cal HR-2508 MR_H 05:14 G0-H0-I1 38.73/54.48/31.90 152.74/117.59/73.25 0.98 3.90 0.5 5*100
Cal HR-2508 MR_H 05:39 E0-G0-I1 15.76/52.81/64.82 73.99/119.54/109.55 0.72 4.52 0.5 5*120
19 Betelgeuse MR_H 05:57 E0-G0-I1 14.89/40.67/51.90 68.16/115.71/103.49 0.93 3.47 0.5 10*100
Cal HR-2508 MR_H 06:22 E0-G0-I1 15.01/49.01/59.94 74.89/123.86/112.97 1.05 3.07 0.5 5*100
Cal HR-2508 MR_H 06:41 E0-G0-H0 43.57/14.53/29.04 75.14/75.12/75.14 0.78 4.14 0.5 5*100
Cal HR-2508 MR_H 07:32 E0-G0-I1 48.84/41.12/12.78 121.77/134.82/75.19 0.58 5.58 0.5 10*100
Cal HR-2508 MR_H 08:09 E0-G0-I1 42.03/36.77/11.12 129.39/143.71/74.51 0.72 4.45 0.5 15*100
2011 February 17
Cal HR-2275 MR_H 02:09 E0-G0-H0 47.72/31.80/15.91 73.01/73.02/73.00 1.39 2.59 0.5 5*100
20 Betelgeuse MR_H 02:47 E0-G0-H0 45.70/30.46/15.24 69.22/69.23/69.22 1.47 2.45 0.5 6*100

Notes. Bp is the projected baseline length and PA is the position angle of the projected baseline vector (0° is north and 90° is east.)

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