Paris Observatory Geodetic VLBI Center

Radio source coordinate time series for 1221+809 (2026b, independent mode)

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

Right ascension: 185.9187232808703°
Declination: 80.6678723557770°
No. sessions: 160
No. delays: 11210
Defining: Yes
RMS(α cos δ) = 2.3790 mas
RMS(δ) = 1.9255 mas
Variability ellipse semimajor axis = 3.0085 mas
Variability ellipse semiminor axis = 0.5622 mas
Variability ellipse position angle = -51.4 deg
Equivalent α-δ correlation = -0.93

Quarterly time series for 1221+809 (2026b, 4 global solutions)

Data

Right ascension: 185.9187239982082°
Declination: 80.6678723546736°
No. sessions: 155
No. delays: 11195
Defining: Yes
RMS(α cos δ) = 0.1441 mas
RMS(δ) = 0.1596 mas
Variability ellipse semimajor axis = 0.1600 mas
Variability ellipse semiminor axis = 0.1436 mas
Variability ellipse position angle = -8.9 deg
Equivalent α-δ correlation = -0.03