Table 3
Basic properties of θ Boo and its calibrators used for the nulling observations on 2017 April 11, 2018 May 23, and 2023 May 25.
| ID | HD | RA | Dec | Spectral type | mV | mK | θLD ±1σ (mas) | References |
|---|---|---|---|---|---|---|---|---|
| θ Boo | 126 660 | 14 25 11.8 | +51 51 02.7 | F7V | 4.04±0.002 | 2.80±0.09 | 1.14±0.05 | [Du02], [Kh09] |
| CAL 1 | 128 902 | 1438 12.6 | +43 38 31.7 | K4III | 5.72±0.004 | 2.32±0.259 | 1.83±0.25 | [Kh09] |
| CAL 2 | 138 265 | 15 27 51.4 | +60 40 12.8 | K5III | 5.91±0.004 | 1.59±0.238 | 2.83±0.35 | [Kh09] |
| CAL 3 | 131507 | 14 51 26.4 | +59 17 38.4 | K4III | 5.48±0.003 | 2.21±0.233 | 1.97±0.24 | [Kh09] |
| CAL 4 | 128 000 | 14 32 30.9 | +55 23 52.8 | K5III | 5.72±0.004 | 2.14±0.195 | 2.1±0.21 | [Kh09] |
| CAL 5 | 138 265 | 15 27 51.4 | +60 40 12.8 | K5III | 5.91±0.004 | 1.59±0.238 | 2.83±0.35 | [Kh09] |
Notes. Coordinates and spectral types from SIMBAD; V&K magnitudes and error bars from [Du02] Ducati (2002) and [Kh09] Kharchenko & Roeser (2009); Limb-darkened angular diameters and their 1σ uncertainties from Chelli et al. (2016).
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