VLA calibrator information for 0321+1221

This page summarizes the information for 0321+1221 as found in the original VLA calibrator list and, if found there, a link to search the NRAO VLA Archive Survey (NVAS) for calibrator data before 2010. Furthermore, a table with the most recent approximate flux densities, starting from 2017 as mined from the VLA CASA pipeline is presented.

If shown at the top, we have recovered the original, pre-WIDAR ANTSOL flux density solutions from the period roughly 2000-2007; symbols as explained next.
The mined data are plotted (gray, on the left hand side) as function of (log) frequency on the top and as function of time on the bottom. The frequency band symbols in the bottom panel follow the symbols as outlined in the top panel:

4-band  (~75 MHz) horizontal stripe       X-band (~10.0 GHz) cross
P-band (~350 MHz) open triangle        U/Ku-band (~15.0 GHz) filled square
L-band (~1.5 GHz) VLA-Y shape             K-band (~22.2 GHz) open circle
S-band (~3.0 GHz) filled triangle      A/Ka-band (~33.2 GHz) 6-pointed star
C-band (~6.0 GHz) open square             Q-band (~45.0 GHz) filled circle
Assume a 10% flux density error on each point, up to 30% for the higher frequency data points. The dashed lines in the frequency plot indicate the approximate spectral index in the frequency band (tied to the measured flux density).
Depending on the spectral behavior, different receiver observing bands (as indicated with the log-frequency axis) may have very different typical flux densities. Note that there can be significant flux density changes for different array configurations, which start date is indicated at the top of the time-line figure. Calendar years are separated by vertical dotted lines.
If shown, a curve depicts a fit to the (unweighted) average data for each band (if there are more than two bands with measured flux densities). The fit equation is listed at the top where the x-coordinate represents the base-10 log of the frequency (GHz) and the y-coordinate represents the base-10 log of the flux density (mJy/bm). The fit may use more data than shown and is using data with different time stamps, which means typically different flux densitities in a single band for genuine variable sources (and/or observed in different array configurations).
Depending on the variability of the source, array configuration and the quality of the data, this fit may, or may not, be representative for the data!

(Click on the figure for a larger view in a new tab/window)

 Original (outdated) VLA calibrator list information: 
 IAU NAME EQUINOX  PC RA(hh,mm,ss)    DEC(ddd,mm,ss)   POS.REF ALT.NAME
 ===================================================================
 0321+123   J2000  A 03h21m53.103505s  12d21'13.954030"  Aug01         
 0319+121   B1950  A 03h19m08.206300s  12d10'31.536000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  P P P P       1.74
   6cm    C  P P P P       1.10
 3.7cm    X  P P P P       1.18
   2cm    U  S S S S       0.75
 0.7cm    Q  W W W W       0.3

Default NVAS search around this position (in new tab/window)

Results from CASA pipeline flux density mining:
Observing date (UT)Flux density (Jy/bm)Source name used
L-band data ("VLA Y-arm" symbols)
201810071.956J0321+1221
201810071.949J0321+1221
201810071.956J0321+1221
201810081.949J0321+1221
201810081.952J0321+1221
201810081.955J0321+1221
201810081.960J0321+1221
201810111.950J0321+1221
201810162.072J0321+1221
201810162.010J0321+1221
201810162.023J0321+1221
201810192.011J0321+1221
201810222.007J0321+1221
201810221.987J0321+1221
201810222.041J0321+1221
201810222.032J0321+1221
201810222.024J0321+1221
201810242.015J0321+1221
201810242.015J0321+1221
201810252.008J0321+1221
201810302.013J0321+1221
201810302.021J0321+1221
201908281.965J0321+1221
S-band data (filled triangles)
201709101.775J0321+1221
201709151.744J0321+1221
201709151.756J0321+1221
201710081.738J0321+1221
201712041.765J0321+1221
201712041.803J0321+1221
201801041.783J0321+1221
202008061.818J0321+1221
202009191.844J0321+1221
C-band data (open squares)
202110111.445J0321+1221
X-band data (X-crosses)
202104040.992J0321+1221