Paris Observatory Geodetic VLBI Center

Radio source coordinate time series for 1638+540 (2026b, independent mode)

Data - BVID - NED - MOJAVE - SIMBAD - PanSTARRS-1

Right ascension: 249.9160127055714°
Declination: 53.9630883886912°
No. sessions: 7
No. delays: 797
Defining: No
RMS(α cos δ) = 0.2268 mas
RMS(δ) = 0.4112 mas
Variability ellipse semimajor axis = 0.4531 mas
Variability ellipse semiminor axis = 0.1231 mas
Variability ellipse position angle = -25.8 deg
Equivalent α-δ correlation = -0.80

Observed in only 7 session(s)

Quarterly time series for 1638+540 (2026b, 4 global solutions)

Data

Right ascension: 249.9160126865971°
Declination: 53.9630883549985°
No. sessions: 7
No. delays: 797
Defining: No
RMS(α cos δ) = 0.1919 mas
RMS(δ) = 0.2290 mas
Variability ellipse semimajor axis = 0.2789 mas
Variability ellipse semiminor axis = 0.1072 mas
Variability ellipse position angle = -38.1 deg
Equivalent α-δ correlation = -0.73

Observed in only 7 session(s)