Proper motion differences between catalogs

Explanation

PM / PM error

PPMXL
URAT1
UCAC4
Tycho
Gaia
N: 26,141,8296
μ PMe: 9.3275e-11
σ PMe: 0.055172
N: 29,024,331
μ PMe: 7.1845e-10
σ PMe: 0.022448
N: 108,295,887
μ PMe: 8.9564e-11
σ PMe: 0.081924
N: 2,430,389
μ PMe: 2.8538e-08
σ PMe: 0.16365
N: 2,028,354
μ PMe: 1.9222e-07
σ PMe: 2.8141

Catalog to catalog proper motion variation

PPMXL
URAT1
UCAC4
Tycho
Gaia
PPMXL N: 596,944
μ RA: 0.14766
σ RA: 7.3482
μ Dec: 0.076602
σ Dec: 9.1179
μ Err: 0.0050885
σ Err: 1.0728
N: 2,205,373
μ RA: 0.046436
σ RA: 10.992
μ Dec: 0.014134
σ Dec: 13.205
μ Err: -0.46194
σ Err: 16.735
N: 136,913
μ RA: 0.1396
σ RA: 1.33
μ Dec: -0.004873
σ Dec: 1.8885
μ Err: -0.0021525
σ Err: 0.86895
N: 24,959
μ RA: -0.062871
σ RA: 3.8345
μ Dec: -0.034428
σ Dec: 3.7679
μ Err: 0.043891
σ Err: 2.0325
URAT1 N: 411,988
μ RA: -0.013672
σ RA: 7.8626
μ Dec: 0.77581
σ Dec: 8.4893
μ Err: 18.066
σ Err: 2.7702
N: 17,668
μ RA: 0.037296
σ RA: 5.6227
μ Dec: 0.023621
σ Dec: 6.2316
μ Err: 0.10349
σ Err: 2.6792
N: 78,909
μ RA: 0.081066
σ RA: 5.0783
μ Dec: 0.018824
σ Dec: 5.3776
μ Err: 0.076206
σ Err: 3.8558
UCAC4 N: 111,990
μ RA: 0.13316
σ RA: 2.1906
μ Dec: -0.0023937
σ Dec: 2.778
μ Err: -0.2998
σ Err: 16.983
N: 387,547
μ RA: 0.02214
σ RA: 7.5476
μ Dec: -0.73973
σ Dec: 8.1903
μ Err: -16.65
σ Err: 7.4174
Tycho N: 22,513
μ RA: -0.0065931
σ RA: 3.7016
μ Dec: -0.012866
σ Dec: 3.7081
μ Err: 0.012354
σ Err: 2.4086