Table B.1
Log of Narval and Neo-Narval observations of Betelgeuse and polarimetric measurements since August 2018.
| Date | Julian date | Stokes | Number of cycles averaged | Narval (N) NeoNarval (NN) | Peak SNR |
|---|---|---|---|---|---|
| August 18, 2018 | 8349.648 | Q | 2 | N | 837 |
| August 18, 2018 | 8349.654 | U | 2 | N | 1223 |
| September 19, 2018 | 8381.675 | Q | 2 | N | 1418 |
| September 19, 2018 | 8381.68 | U | 2 | N | 1330 |
| October 05, 2018 | 8397.694 | Q | 2 | N | 1509 |
| October 05, 2018 | 8397.7 | U | 2 | N | 1562 |
| October 23, 2018 | 8415.635 | Q | 2 | N | 1280 |
| October 23, 2018 | 8415.64 | U | 2 | N | 1293 |
| November 13, 2018 | 8436.59 | Q | 2 | N | 1075 |
| November 13, 2018 | 8436.596 | U | 2 | N | 992 |
| January 04, 2019 | 8488.53 | Q | 2 | N | 1180 |
| January 04, 2019 | 8488.535 | U | 2 | N | 1112 |
| January 15, 2019 | 8499.432 | Q | 2 | N | 1107 |
| January 15, 2019 | 8499.436 | U | 2 | N | 1163 |
| January 21, 2019 | 8505.427 | Q | 2 | N | 473 |
| January 21, 2019 | 8505.433 | U | 2 | N | 492 |
| January 26, 2019 | 8510.458 | Q | 2 | N | 1224 |
| January 26, 2019 | 8510.463 | U | 2 | N | 1279 |
| March 11, 2019 | 8554.379 | Q | 2 | N | 1441 |
| March 11, 2019 | 8554.386 | U | 2 | N | 1512 |
| March 28, 2019 | 8571.365 | Q | 2 | N | 1583 |
| March 28, 2019 | 8571.37 | U | 2 | N | 1661 |
| April 27, 2019 | 8601.357 | Q | 2 | N | 1680 |
| April 27, 2019 | 8601.366 | U | 2 | N | 1644 |
| April 30, 2019 | 8604.332 | Q | 2 | N | 397 |
| April 30, 2019 | 8604.341 | U | 2 | N | 974 |
| August 20, 2019 | 8716.671 | Q | 2 | N | 966 |
| August 22, 2019 | 8718.676 | U | 2 | N | 1341 |
| February 02, 2020 | 8882.332 | Q | 2 | NN | 688 |
| February 02, 2020 | 8882.33 | U | 2 | NN | 805 |
| February 14, 2020 | 8894.369 | Q | 2 | NN | 805 |
| February 14, 2020 | 8894.366 | U | 2 | NN | 855 |
| February 21, 2020 | 8901.378 | Q | 2 | NN | 929 |
| February 21, 2020 | 8901.381 | U | 2 | NN | 880 |
| February 24, 2020 | 8904.381 | Q | 2 | NN | 957 |
| February 24, 2020 | 8904.384 | U | 2 | NN | 1028 |
| March 11, 2020 | 8920.289 | Q | 2 | NN | 847 |
| March 11, 2020 | 8920.287 | U | 2 | NN | 947 |
| August 22, 2020 | 9084.665 | Q | 2 | NN | 1152 |
| August 22, 2020 | 9084.662 | U | 2 | NN | 958 |
| September 03, 2020 | 9096.654 | Q | 2 | NN | 652 |
| September 03, 2020 | 9096.658 | U | 2 | NN | 611 |
| September 29, 2020 | 9122.699 | Q | 2 | NN | 882 |
| September 29, 2020 | 9122.701 | U | 2 | NN | 831 |
| October 17, 2020 | 9140.667 | Q | 2 | NN | 839 |
| October 17, 2020 | 9140.668 | U | 2 | NN | 936 |
| October 30, 2020 | 9153.605 | Q | 2 | NN | 903 |
| October 30, 2020 | 9153.607 | U | 2 | NN | 897 |
| November 23, 2020 | 9177.468 | Q | 2 | NN | 550 |
| November 23, 2020 | 9177.469 | U | 2 | NN | 541 |
| December 17, 2020 | 9201.413 | Q | 2 | NN | 829 |
| December 17, 2020 | 9201.415 | U | 2 | NN | 813 |
| January 06, 2021 | 9221.4 | Q | 2 | NN | 996 |
| January 06, 2021 | 9221.403 | U | 2 | NN | 935 |
| February 10, 2021 | 9256.418 | Q | 2 | NN | 1035 |
| February 10, 2021 | 9256.421 | U | 2 | NN | 977 |
Notes: Columns give the date, the heliocentric Julian date (+2450000), the observed Stokes parameter, the number of Stokes QU collected, and the instrument used (N stands for Narval, NN for Neo-Narval). An observation consists upon 4 exposures with changing polarimetric modulation that, after reduction, produce polarization spectra of either Stokes Q or U. Previous QU measurements are summarised by Aurière et al. (2016); Mathias et al. (2018) and López Ariste et al. (2018). Beyond a 2-year proprietary embargo, all data is publicly available at PolarBase (http://polarbase.irap.omp.eu/).
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