Differential image motion in astrometric observations with very large seeing-limited telescopes

Open Access

Table 5

Differential image motion amplitude σ_a [μas] at 30 s exposure in the zenith for a typical FORS2 star field in the Galactic plane.

R	k/β

	6/2	8 /3	10/4	12/5	14/6
0.5′	58 ± 26	47 ± 10	28 ± 13	25 ± 10	17± 8
1′	206 ± 42	179 ± 27	90 ± 31	85 ± 18	59 ± 22
1.5′	423 ± 37	384 ± 26	194 ± 29	181 ± 26	129 ± 37
2.0′	734 ± 44	670 ± 36	318 ± 33	295 ± 28	200 ± 36

Notes. Uncertainties indicate the scatter of the individual estimates for P-stars in FORS2 fields.

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