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Gaia Data Release 1
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Table 7

Comparison between the Hipparcos and TGAS parallax determinations.

Cluster N(TH) N(TT) ϖ T σϖ Σϖ N(Hip) ϖ H σϖ Δϖ σΔϖ
Hyades 88 22 21.39 0.21 0.33 150 21.53 0.23 –0.22 0.40
Coma Ber 28 22 11.73 0.05 0.25 27 11.53 0.12 +0.20 0.28
Pleiades 51 101 7.48 0.03 0.25 53 8.32 0.13 –0.85 0.28
Praesepe 24 55 5.47 0.05 0.25 24 5.49 0.18 –0.02 0.31
α Per 51 65 5.91 0.03 0.25 50 5.80 0.10 0.09 0.27
IC 2391 8 35 6.97 0.13 0.28 11 6.90 0.12 –0.03 0.30
IC 2602 23 43 6.74 0.05 0.25 15 6.73 0.09 0.02 0.27
Blanco 1 8 35 4.34 0.11 0.27 13 4.83 0.27 –0.50 0.38
NGC 2451A 4 33 5.59 0.11 0.27 14 5.45 0.11 0.14 0.29
NGC 6475 11 67 3.57 0.02 0.25 20 3.70 0.14 –0.13 0.29
NGC 7092 5 18 2.99 0.12 0.28 7 3.30 0.19 –0.31 0.34
NGC 2516 6 78 3.01 0.10 0.27 11 2.92 0.10 0.09 0.29
NGC 2232 4 27 3.00 0.06 0.26 6 2.84 0.18 0.16 0.32
IC 4665 6 10 2.83 0.05 0.25 7 2.81 0.27 0.02 0.37
NGC 6633 4 43 2.41 0.04 0.25 6 2.67 0.32 –0.26 0.41
Coll 140 4 27 2.86 0.11 0.27 9 2.66 0.13 0.20 0.30
NGC 2422 2 35 2.28 0.09 0.27 7 2.52 0.21 –0.24 0.34
NGC 3532 4 128 2.42 0.04 0.25 6 2.43 0.24 –0.01 0.35
NGC 2547 8 26 2.75 0.08 0.26 8 2.11 0.17 0.64 0.31

Notes. The meaning of the columns is as follows: N(TH): number of stars in the TGAS solution with Hipparcos first epoch data; N(TT): number of stars in the TGAS solution with Tycho-2 first epoch data; ϖT: TGAS parallax for the cluster; σϖ: formal su on ϖT; Σϖ: su including calibration uncertainty of 0.25 mas; N(Hip): number of stars in the Hipparcos solution; ϖH: Hipparcos parallax for the cluster; σϖ: formal su on ϖH; Δϖ = ϖT−ϖH; σΔϖ: su on the parallax difference.

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