Paris Observatory Geodetic VLBI Center

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

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

Right ascension: 249.9160126932147°
Declination: 53.9630883324693°
No. sessions: 6
No. delays: 562
Defining: No
RMS(α cos δ) = 0.4601 mas
RMS(δ) = 0.3500 mas
Variability ellipse semimajor axis = 0.4603 mas
Variability ellipse semiminor axis = 0.3498 mas
Variability ellipse position angle = 87.9 deg
Equivalent α-δ correlation = 0.02

Observed in only 6 session(s)

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

Data

Right ascension: 249.9160127045068°
Declination: 53.9630883431631°
No. sessions: 6
No. delays: 562
Defining: No
RMS(α cos δ) = 0.2087 mas
RMS(δ) = 0.2271 mas
Variability ellipse semimajor axis = 0.2866 mas
Variability ellipse semiminor axis = 0.1141 mas
Variability ellipse position angle = -41.6 deg
Equivalent α-δ correlation = -0.72

Observed in only 6 session(s)