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Table 3

Summary of the measurements of the offset of photocenter.

SDSS J121855.80+020002.1, z = 0.327, MAG
date days ΔRA ± σ ΔDE ± σ ΔMAGR ± σ
(mas) (mas) (10-1)

2008.016 0.0 –11  ±  3 –3  ±  2 –0.420  ±  0.009
2008.163 53.4 +15  ±  3 + 4  ±  2 +0.134  ±  0.007
2008.263 36.8 + 6  ±  2 –3  ±  1 –0.917  ±  0.011
2008.415 55.4 –4  ±  1 + 1  ±  1 +1.774  ±  0.012
2008.970 202.7 –8  ±  1 + 4  ±  1 –1.773  ±  0.007
2009.382 150.5   0  ±  4 –3  ±  2 +2.070  ±  0.011

SDSS J162011.28+172427.5, z = 0.112, MAGR = 162
date days ΔRA ± σ ΔDE ± σ ΔMAGR ± σ
(mas) (mas) (10-1)

2007.277 0.0 –17  ±  10 +24  ±  22 –0.136  ±  0.007
2007.430 58.8 + 2  ±  9    0  ±  24 +0.032  ±  0.007
2008.415 356.9 +14  ±  6 + 4  ±  21 +0.021  ±  0.006
2008.647 84.9 –23  ±  8 –59  ±  16 +0.002  ±  0.005
2009.181 195.1 +76  ±  19 +36    ±  15 +0.550  ±  0.023
2009.382 73.3 –47  ±  18 –58  ±  22 –0.560  ±  0.023

Notes. The columns in Table are: Col. 1 – the mean epoch of observation; Col. 2 – the time interval in days between each measurement; Col. 3 – the X-direction (basically RA) astrometric variation in mas from the previous measurement; Col. 4 – the Y-direction (basically DEC) astrometric variation in mas from the previous measurement; Col. 5 – the magnitude variation given in tenths of magnitude from the previous measurement. In the first lines, the values correspond to the offsets to the nominal CDS references. In the subsequent lines, we present the offsets to the previous line values. The combined corresponding errors (σ) are given.

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