========================================================================== J/ApJ/707/L114 The orbit of S2 star around Sgr A* (Gillessen+, 2009) The following files can be converted to FITS (extension .fit or fit.gz) table1.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/ApJ/707/L114 ==========================================================================
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Beginning of ReadMe : J/ApJ/707/L114 The orbit of S2 star around Sgr A* (Gillessen+, 2009) ================================================================================ The orbit of the star S2 around Sgr A* from Very Large Telescope and Keck data. Gillessen S., Eisenhauer F., Fritz T.K., Bartko H., Dodds-Eden K., Pfuhl O., Ott T., Genzel R. <Astrophys. J., 707, L114-L117 (2009)> =2009ApJ...707L.114G ================================================================================ ADC_Keywords: Positional data ; Radial velocities ; Milky Way ; Stars, double and multiple Keywords: astrometry - black hole physics - Galaxy: center - infrared: stars Abstract: Two recent papers (Ghez et al. 2008ApJ...689.1044G; Gillessen et al. 2009ApJ...692.1075G) have estimated the mass of and the distance to the massive black hole (MBH) in the center of the Milky Way using stellar orbits. The two astrometric data sets are independent and yielded consistent results, even though the measured positions do not match when simply overplotting the two sets. In this Letter, we show that the two sets can be brought to excellent agreement with each other when we allow for a small offset in the definition of the reference frame of the two data sets. The required offsets in the coordinates and velocities of the origin of the reference frames are consistent with the uncertainties given in Ghez et al. The so-combined data set allows for a moderate improvement of the statistical errors of the mass of and the distance to Sgr A*, but the overall accuracies of these numbers are dominated by systematic errors and the long-term calibration of the reference frame. Description: The astrometric data from the NTT/VLT we are using are identical to the data from Gillessen et al. (2009ApJ...692.1075G) up to 2008 August. Since then, one more epoch has been observed in 2008 and 11 more epochs in 2009. In total, the NTT/VLT data set contains 70 epochs from 1992 March to 2009 August. In their Table 3 Ghez et al. (2008ApJ...689.1044G) presented the measured positions for all Keck epochs. We use the given 26 epochs, ranging between 1995 and 2008. Objects: --------------------------------------- RA (2000) DE Designation(s) --------------------------------------- 17 45 40.0 -29 00 28 S2 = [EG97] S2 ---------------------------------------
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