Paris Observatory Geodetic VLBI Center

Radio source coordinate time series for 1642+690 (2026b, independent mode)

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

Right ascension: 250.5327021386940°
Declination: 68.9443767710682°
No. sessions: 266
No. delays: 20947
Defining: Yes
RMS(α cos δ) = 3.7179 mas
RMS(δ) = 2.4015 mas
Variability ellipse semimajor axis = 4.4276 mas
Variability ellipse semiminor axis = 0.1149 mas
Variability ellipse position angle = -57.1 deg
Equivalent α-δ correlation = -1.00

Quarterly time series for 1642+690 (2026b, 4 global solutions)

Data

Right ascension: 250.5327021862091°
Declination: 68.9443767647516°
No. sessions: 244
No. delays: 20712
Defining: Yes
RMS(α cos δ) = 0.1618 mas
RMS(δ) = 0.2296 mas
Variability ellipse semimajor axis = 0.2313 mas
Variability ellipse semiminor axis = 0.1594 mas
Variability ellipse position angle = 9.5 deg
Equivalent α-δ correlation = 0.12