Plots and Data

NRAO

Analysis of public VLA observations

SWIFT

Analysis of Swift data

Orbital Elements

Parameter

Gillessen et al. 2012a

Gillessen et al. 2012b

semi major axis (mas)

521 ± 28

666 ± 39

eccentricity

0.9384 ± 0.0066

0.9664 ± 0.0026

inclination [°]

106.55 ± 0.88

109.48 ± 0.81

position angle of ascending node [°]

101.5 ± 1.1

95.8 ± 1.1

longitude of periastron [°]

109.59 ± 0.78

108.50 ± 0.74

epoch of periastron [yr]

2013.51 ± 0.04

2013.69 ± 0.04

orbital period [yr]

137 ± 11

198 ± 18

Astrometry & Radial Velocities

Epoch [Julian year]

R.A. []

Dec []

error estimate []

2002.6

0.2771

-0.155712

0.002

2003.4

0.276067

-0.140544

0.002

2004.6

0.263562

-0.130565

0.002

2005.4

0.264142

-0.123733

0.002

2006.4

0.240084

-0.109394

0.002

2007.3

0.225361

-0.102138

0.002

2008.5

0.209801

-0.0879578

0.002

2009.25

0.193148

-0.0740471

0.002

2010.5

0.158347

-0.0540539

0.002

2011.3

0.139725

-0.0393364

0.002

2011.5

0.134431

-0.0376276

0.002

2012.2

0.113924

-0.0374186

0.005

2012.2126

0.122807

-0.0228154

0.005

2012.4942

0.10694

-0.0138847

0.005

Epoch [Julian year]

vLSR [km/s]

error estimate [km/s]

2003.2711

990

50

2004.5356

1052

30

2005.2153

1010

50

2008.2624

1256

20

2009.3851

1404

30

2010.3539

1522

25

2011.3169

1692

60

2011.5665

1640

60

2012.2126

1934

50

2012.3612

1930

50

2012.4942

2030

50