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The reference frame for the orbit is True-of-Date for the MSG satellites and Mean-of-Date for Meteosat-7 as indicated in the details below.

Last update: 21/5/2018, day: 141

CURRENT ORBIT DETAILS FOR METEOSAT-11 (MSG4)

Coordinate Frame: Earth-centred, True of date

MSG4 Orbit State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

X-Position: X = -21799.8469811 km, X-Velocity: XDOT = 2.6315666 km/s
Y-Position: Y = -36091.6054102 km, Y-Velocity: YDOT = -1.5883676 km/s
Z-Position: Z = 386.1068538 km, Z-Velocity: ZDOT = 0.0658071 km/s

SRP coefficient: CR = 1.21976

Semi-Major Axis: A = 42163.0541725 km
Eccentricity: E = 0.00014130
Inclination: I = 1.334067 deg
Right Asc. of Asc. Node: RAAN = 215.7128457 deg
Argument of Perigee: AOP = 144.7677418 deg
True Anomaly: TA = 238.3924506 deg

Longitude at epoch: LONG = 0.28082300 deg
Mean Longitude: MEAN LONG = 0.299487 deg
Mean Drift Rate: MEAN DRIFT = 0.02818 deg/day

Perigee Height at Epoch: HPERI = 35778.95953295 km
Apogee Height at Epoch: HAPO = 35790.87481205 km

MSG4 Attitude State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

Spin Axis Right Asc.: RA = 130.9908681 deg
Spin Axis Declination: DEC = 88.7375926 deg

Spin Axis Unit X: UX = -0.01445124
Spin Axis Unit Y: UY = 0.01662960
Spin Axis Unit Z: UZ = 0.99975728

MSG4 Physical State

Epoch: 2018/05/21 04:00:00.000 ( 18.141.04.00.00.000 ) UTC

Spin Rate: SPIN = 99.5205293 rpm

Total Mass: MTOT = 1212.11344100 kg
Fuel Mass: MFUEL = 54.36930690 kg
Oxidizer Mass: MOXID = 96.23583490 kg

CURRENT ORBIT DETAILS FOR METEOSAT-10 (MSG3)

Coordinate Frame: Earth-centred, True of date

MSG3 Orbit State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

X-Position: X = -15794.9882782 km, X-Velocity: XDOT = 2.8504215 km/s
Y-Position: Y = -39100.1567583 km, Y-Velocity: YDOT = -1.1506337 km/s
Z-Position: Z = -410.9219334 km, Z-Velocity: ZDOT = -0.0414359 km/s

SRP coefficient: CR = 1.20635

Semi-Major Axis: A = 42166.5260254 km
Eccentricity: E = 0.00017490
Inclination: I = 0.9530359 deg
Right Asc. of Asc. Node: RAAN = 32.1455043 deg
Argument of Perigee: AOP = 353.133679 deg
True Anomaly: TA = 222.7277299 deg

Longitude at epoch: LONG = 9.41655100 deg
Mean Longitude: MEAN LONG = 9.432832 deg
Mean Drift Rate: MEAN DRIFT = -0.01422 deg/day

Perigee Height at Epoch: HPERI = 35781.01410000 km
Apogee Height at Epoch: HAPO = 35795.76395080 km

MSG3 Attitude State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

Spin Axis Right Asc.: RA = 309.6779723 deg
Spin Axis Declination: DEC = 89.2519483 deg

Spin Axis Unit X: UX = 0.00833563
Spin Axis Unit Y: UY = -0.01004817
Spin Axis Unit Z: UZ = 0.99991477

MSG3 Physical State

Epoch: 2018/05/21 04:00:00.000 ( 18.141.04.00.00.000 ) UTC

Spin Rate: SPIN = 99.7258354 rpm

Total Mass: MTOT = 1140.11838200 kg
Fuel Mass: MFUEL = 34.28545550 kg
Oxidizer Mass: MOXID = 53.46962710 kg

CURRENT ORBIT DETAILS FOR METEOSAT-9 (MSG2)

Coordinate Frame: Earth-centred, True of date

MSG2 Orbit State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

X-Position: X = -19785.9617489 km, X-Velocity: XDOT = 2.7113238 km/s
Y-Position: Y = -37234.1805266 km, Y-Velocity: YDOT = -1.4418688 km/s
Z-Position: Z = 341.4306536 km, Z-Velocity: ZDOT = -0.1514584 km/s

SRP coefficient: CR = 1.20955

Semi-Major Axis: A = 42166.6674902 km
Eccentricity: E = 0.00008610
Inclination: I = 2.861478 deg
Right Asc. of Asc. Node: RAAN = 71.3373503 deg
Argument of Perigee: AOP = 252.6391333 deg
True Anomaly: TA = 278.0262434 deg

Longitude at epoch: LONG = 3.42756300 deg
Mean Longitude: MEAN LONG = 3.425516 deg
Mean Drift Rate: MEAN DRIFT = -0.01796 deg/day

Perigee Height at Epoch: HPERI = 35784.89994013 km
Apogee Height at Epoch: HAPO = 35792.16104027 km

MSG2 Attitude State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

Spin Axis Right Asc.: RA = 339.4783783 deg
Spin Axis Declination: DEC = 87.5561344 deg

Spin Axis Unit X: UX = 0.03993460
Spin Axis Unit Y: UY = -0.01494811
Spin Axis Unit Z: UZ = 0.99909048

MSG2 Physical State

Epoch: 2018/05/21 04:00:00.000 ( 18.141.04.00.00.000 ) UTC

Spin Rate: SPIN = 99.4818085 rpm

Total Mass: MTOT = 1090.11565000 kg
Fuel Mass: MFUEL = 13.31240700 kg
Oxidizer Mass: MOXID = 23.01224310 kg

CURRENT ORBIT DETAILS FOR METEOSAT-8 (MSG1)

Coordinate Frame: Earth-centred, True of date

MSG1 Orbit State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

X-Position: X = 7311.6583291 km, X-Velocity: XDOT = 3.0179254 km/s
Y-Position: Y = -41439.4851845 km, Y-Velocity: YDOT = 0.5469291 km/s
Z-Position: Z = -2728.9811761 km, Z-Velocity: ZDOT = -0.2114686 km/s

SRP coefficient: CR = 1.20648

Semi-Major Axis: A = 42163.7182287 km
Eccentricity: E = 0.00019300
Inclination: I = 5.4197397 deg
Right Asc. of Asc. Node: RAAN = 56.8840838 deg
Argument of Perigee: AOP = 344.8323879 deg
True Anomaly: TA = 238.4180105 deg

Longitude at epoch: LONG = 41.41978300 deg
Mean Longitude: MEAN LONG = 41.560534 deg
Mean Drift Rate: MEAN DRIFT = 0.03140 deg/day

Perigee Height at Epoch: HPERI = 35777.44363108 km
Apogee Height at Epoch: HAPO = 35793.71882632 km

MSG1 Attitude State

Epoch: 2018/05/21 00:00:00.000 ( 18.141.00.00.00.000 ) UTC

Spin Axis Right Asc.: RA = 326.6473209 deg
Spin Axis Declination: DEC = 84.6283164 deg

Spin Axis Unit X: UX = 0.07819789
Spin Axis Unit Y: UY = -0.05146939
Spin Axis Unit Z: UZ = 0.99560835

MSG1 Physical State

Epoch: 2018/05/21 04:00:00.000 ( 18.141.04.00.00.000 ) UTC

Spin Rate: SPIN = 99.8634537 rpm

Total Mass: MTOT = 1083.39678600 kg
Fuel Mass: MFUEL = 11.64033380 kg
Oxidizer Mass: MOXID = 17.92145290 kg

Comments:
A Meteosat-8 EWSK manoeuvre is planned on 22/05/2018 at 20:58:00 UTC (day 142).