Plots and Data
NRAO
Analysis of public VLA observations
SWIFT
Orbital Elements
Parameter |
||||
semi major axis (mas) |
521 ± 28 |
666 ± 39 |
880 |
1048 ± 247 |
eccentricity |
0.9384 ± 0.0066 |
0.9664 ± 0.0026 |
0.9814 ± 0.0060 |
0.9762 ± 0.0074 |
inclination [°] |
106.55 ± 0.88 |
109.48 ± 0.81 |
121 ± 3 |
118.1 ± 2.0 |
position angle of ascending node [°] |
101.5 ± 1.1 |
95.8 ± 1.1 |
56 ± 11 |
81.9 ± 4.3 |
longitude of periastron [°] |
109.59 ± 0.78 |
108.50 ± 0.74 |
88 ± 6 |
97.2 ± 2.2 |
epoch of periastron [yr] |
2013.51 ± 0.04 |
2013.69 ± 0.04 |
2014.21 ± 0.14 |
2014.25 ± 0.06 |
orbital period [yr] |
137 ± 11 |
198 ± 18 |
276 ± 111 |
391 ± 66 |
Astrometry & Radial Velocities
VLT/NACO-based L-band positions
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 |
VLT/SINFONI-based Br-gamma positions
Epoch [Julian year] |
R.A. ["] |
error R.A. ["] |
Dec ["] |
error Dec ["] |
2004.5356 |
0.264754 |
0.00247242 |
-0.145519 |
0.00264724 |
2005.2153 |
0.233448 |
0.00478122 |
-0.135809 |
0.00337244 |
2006.2040 |
0.243039 |
0.00489195 |
-0.123933 |
0.00441347 |
2008.2624 |
0.204608 |
0.00349524 |
-0.0849295 |
0.00335883 |
2009.3851 |
0.212171 |
0.00338314 |
-0.0812734 |
0.00265295 |
2010.3539 |
0.160914 |
0.00352225 |
-0.0510249 |
0.00361687 |
2011.3169 |
0.146314 |
0.00268501 |
-0.0381918 |
0.00266301 |
2011.5665 |
0.147089 |
0.00779815 |
-0.0275061 |
0.00633855 |
2012.2126 |
0.132222 |
0.00289233 |
-0.0201099 |
0.003077 |
2012.4942 |
0.122072 |
0.00158594 |
-0.0223565 |
0.00294338 |
2013.2650 |
0.0846412 |
0.0015125 |
0.00105052 |
0.0016 |
VLT/SINFONI-based Br-gamma velocities
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 |
2012.7036 |
2046 |
50 |
2013.2650 |
2180 |
50 |