VLA calibrator information for 0431+2037

This page summarizes the information for 0431+2037 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
 ===================================================================
 0431+206   J2000  B 04h31m03.7620s    20d37'34.250"     Dec00
 0428+205   B1950  B 04h28m06.8674s    20d31'09.128"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  P P P P       3.85                      100
   6cm    C  X S P P       2.35                      100
 3.7cm    X  X X S P       1.66                      100
   2cm    U  X X S S       1.10                      100
 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)
201706253.772J0431+2037
201712143.900J0431+2037
201712223.911J0431+2037
201712243.877J0431+2037
201801093.972J0431+2037
201801173.998J0431+2037
201801183.976J0431+2037
201801193.958J0431+2037
201801194.100J0431+2037
201801203.990J0431+2037
201801213.946J0431+2037
201801233.985J0431+2037
201901223.356J0431+2037
201907263.719J0431+2037
201908283.783J0431+2037
201910163.751J0431+2037
S-band data (filled triangles)
201706252.951J0431+2037
201711093.135J0431+2037
201902083.041J0431+2037
201902243.056J0431+2037
C-band data (open squares)
201712151.967J0431+2037
201804021.823J0431+2037
201811302.034J0431+2037
201812282.015J0431+2037
201902111.985J0431+2037
201902111.982J0431+2037
201910141.973J0431+2037
202101181.924J0431+2037
X-band data (X-crosses)
201804031.023J0431+2037
202101151.166J0431+2037
202103221.350J0431+2037
202103251.380J0431+2037
U-band data (filled squares)
202002150.951J0431+2037
202002150.951J0431+2037
202002170.956J0431+2037
202002190.963J0431+2037
202002290.964J0431+2037
202003020.963J0431+2037
202003040.967J0431+2037
202004080.945J0431+2037
K-band data (open circles)
201804050.519J0431+2037
202012100.607J0431+2037
202012120.613J0431+2037
202012290.614J0431+2037
A-band data (6-pointed stars)
201811120.560J0431+2037
201903100.430J0431+2037
201903150.418J0431+2037
201903170.420J0431+2037
201903170.417J0431+2037
201904020.420J0431+2037
201909170.445J0431+2037
201909190.457J0431+2037
201909230.423J0431+2037
201909250.486J0431+2037
201909250.421J0431+2037
201909260.455J0431+2037
201909270.446J0431+2037
201909280.456J0431+2037
201910070.451J0431+2037
201910110.436J0431+2037
202009250.455J0431+2037
202009300.456J0431+2037
202010030.403J0431+2037
202010050.455J0431+2037
202010060.394J0431+2037
202010070.455J0431+2037
202101200.451J0431+2037
Q-band data (filled circles)
202008090.332J0431+2037