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Table 7

TGAS astrometric parameters.


Cluster ϖ ± ϵϖ
(mas) (mas yr−1) (mas yr−1) (pc) (mag)
NGC 2451A 5.293 ± 0.069 − 20.994 ± 0.186 15.267 ± 0.168
NGC 2451B 2.773 ± 0.089 − 9.876 ± 0.305 4.675 ± 0.252
NGC 2516 2.586 ± 0.063 − 4.662 ± 0.026 11.066 ± 0.027
NGC 2547 2.746 ± 0.091 − 8.935 ± 0.025 4.388 ± 0.025
IC 2391 6.850 ± 0.064 − 25.255 ± 0.029 23.337 ± 0.029
IC 2602 6.757 ± 0.069 − 17.213 ± 0.015 10.544 ± 0.014
IC 4665 2.732 ± 0.091 − 0.825 ± 0.023 − 8.565 ± 0.018
NGC 6633 2.432 ± 0.066 1.325 ± 0.038 − 1.698 ± 0.029

Notes. Thetable lists: mean cluster parallaxes, ϖ, and proper motions, , μδ, estimated from the selected bona fide cluster members as weighted averages. The derived spatial distance,d = 1∕ϖ, and the distance modulus, DM = m0M = −5logϖ − 5, are also reported. The systematic errors correspond to the nominal TGAS systematic uncertainty, mas. These dominate the error budget. R: Random; S: Systematic.

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