Planck 2015 results
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Table 5

Positional offset between the PCCS2 and the VLA (in the sense PCCS2 VLA) in equatorial, Galactic, and ecliptic coordinates.

Equatorial offsets Galactic offsets Ecliptic offsets



Positional Number
Channel RA Dec longitude latitude longitude latitude error of sources
[arcsec] [arcsec] [arcsec] [arcsec] [arcsec] [arcsec] [arcsec]

30 ....... −9 ± 6 −7 ± 7 16 ± 7 0 ± 6 −1 ± 7 −3 ± 8 78.0 66
44 ....... −11 ± 8 8 ± 9 18 ± 9 −7 ± 8 ... ... 97.6 67
70 ....... −3 ± 5 −1 ± 6 4 ± 5 −7 ± 6 −2 ± 5 6 ± 6 58.9 70
100 ....... −1 ± 5 −4 ± 5 7 ± 5 7 ± 5 9 ± 4 −14 ± 5 53.7 70
143 ....... −1 ± 5 −9 ± 4 −6 ± 4 5 ± 5 −1 ± 5 −13 ± 4 48.8 66
217 ....... 5 ± 4 −1 ± 4 −2 ± 4 3 ± 4 3 ± 4 −1 ± 5 37.5 48

Notes. The mean offsets in longitude and latitude (or RA and Dec) are given, together with the standard error on the mean. These offsets place strong limits on any global positional offset between Planck and the VLA, and hence the international celestial reference frame (ICRF). The radial positional uncertainty for an individual source, given in the positional error column, is evaluated from the standard deviations of the offset in the latitude and longitude positions, assuming no correlations between these offsets.

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