Paris Observatory Geodetic VLBI Center

Radio source coordinate time series for 1640-231 (2026b, independent mode)

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

Right ascension: 250.8891269269113°
Declination: -23.2688496749369°
No. sessions: 8
No. delays: 539
Defining: No
RMS(α cos δ) = 0.8225 mas
RMS(δ) = 0.5427 mas
Variability ellipse semimajor axis = 0.8622 mas
Variability ellipse semiminor axis = 0.4772 mas
Variability ellipse position angle = -68.8 deg
Equivalent α-δ correlation = -0.39

Observed in only 8 session(s)

Quarterly time series for 1640-231 (2026b, 4 global solutions)

Data

Right ascension: 250.8891270822835°
Declination: -23.2688496901299°
No. sessions: 8
No. delays: 539
Defining: No
RMS(α cos δ) = 0.3078 mas
RMS(δ) = 0.9796 mas
Variability ellipse semimajor axis = 0.9796 mas
Variability ellipse semiminor axis = 0.3076 mas
Variability ellipse position angle = -0.7 deg
Equivalent α-δ correlation = -0.04

Observed in only 8 session(s)