Paris Observatory Geodetic VLBI Center

Radio source coordinate time series for 1638+398 (2026b, independent mode)

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

Right ascension: 250.1234465936449°
Declination: 39.7794536849018°
No. sessions: 2051
No. delays: 157139
Defining: No
RMS(α cos δ) = 6504.0630 mas
RMS(δ) = 3052.0881 mas
Variability ellipse semimajor axis = 6963.1132 mas
Variability ellipse semiminor axis = 1770.0657 mas
Variability ellipse position angle = 68.3 deg
Equivalent α-δ correlation = 0.78

Quarterly time series for 1638+398 (2026b, 4 global solutions)

Data

Right ascension: 250.1234698978092°
Declination: 39.7794523365692°
No. sessions: 1996
No. delays: 156726
Defining: No
RMS(α cos δ) = 0.1647 mas
RMS(δ) = 0.1822 mas
Variability ellipse semimajor axis = 0.1864 mas
Variability ellipse semiminor axis = 0.1600 mas
Variability ellipse position angle = -24.2 deg
Equivalent α-δ correlation = -0.11