VLA calibrator information for 1549+5038

This page summarizes the information for 1549+5038 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
 ===================================================================
 1549+506   J2000  A 15h49m17.468534s  50d38'05.788200"  Aug01         
 1547+507   B1950  A 15h47m52.271600s  50d47'09.255000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  P P S S       0.70
   6cm    C  P P S S       0.70
 3.7cm    X  P P P P       1.17
   2cm    U  S S S S       0.8
 1.3cm    K  S S S S       1.03
 0.7cm    Q  W W W W       0.6

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)
201706060.511J1549+5038
201706100.509J1549+5038
201709150.655J1549+5038
201709270.663J1549+5038
201711030.649J1549+5038
201711240.612J1549+5038
201712020.596J1549+5038
201803190.646J1549+5038
201805080.634J1549+5038
201805210.640J1549+5038
201805240.650J1549+5038
201805250.649J1549+5038
201805290.655J1549+5038
201902200.680J1549+5038
201903270.672J1549+5038
201905110.672J1549+5038
201908100.673J1549+5038
201908230.639J1549+5038
201908310.657J1549+5038
201909010.657J1549+5038
201909040.799J1549+5038
201909060.931J1549+5038
201909230.653J1549+5038
201909240.652J1549+5038
201909260.650J1549+5038
201910010.661J1549+5038
S-band data (filled triangles)
201904270.764J1549+5038
202206190.793J1549+5038
202206200.752J1549+5038
C-band data (open squares)
201710130.765J1549+5038
201712010.779J1549+5038
201803280.759J1549+5038
201902200.723J1549+5038
201903230.744J1549+5038
201904230.733J1549+5038
201908040.685J1549+5038
201908110.681J1549+5038
201908130.739J1549+5038
201908280.674J1549+5038
201909230.717J1549+5038
201909240.726J1549+5038
201909260.736J1549+5038
201910010.738J1549+5038
201910080.692J1549+5038
202206270.706J1549+5038
202206290.797J1549+5038
X-band data (X-crosses)
201802100.659J1549+5038
201805040.662J1549+5038
201805080.662J1549+5038
201902200.680J1549+5038
201903120.681J1549+5038
201903190.707J1549+5038
201909230.685J1549+5038
201909240.685J1549+5038
201909260.676J1549+5038
202112020.709J1549+5038
202207130.719J1549+5038
U-band data (filled squares)
202107170.646J1549+5038