VLA calibrator information for 2131-1207

This page summarizes the information for 2131-1207 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
 ===================================================================
 2131-121   J2000  A 21h31m35.261758s -12d07'04.795880"  Aug01         
 2128-123   B1950  A 21h28m52.676100s -12d20'20.535000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  P P S X       1.40            6
   6cm    C  P P P P       3.00
 3.7cm    X  P P P P       3.10
   2cm    U  P P P P       3.50
 0.7cm    Q  S S S S       1.8

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)
201706022.225J2131-1207
201711122.160J2131-1207
201712052.127J2131-1207
201805291.238J2131-1207
201812042.037J2131-1207
201812042.061J2131-1207
201812092.062J2131-1207
201909102.075J2131-1207
202112221.981J2131-1207
S-band data (filled triangles)
201707213.062J2131-1207
201711012.171J2131-1207
201711012.193J2131-1207
201711112.163J2131-1207
201711112.187J2131-1207
201711202.142J2131-1207
201711202.155J2131-1207
201711222.147J2131-1207
201711222.156J2131-1207
201802091.997J2131-1207
201802122.054J2131-1207
201802162.094J2131-1207
201812042.183J2131-1207
201812042.098J2131-1207
201812092.161J2131-1207
201904052.128J2131-1207
201904162.119J2131-1207
201909102.002J2131-1207
202010202.213J2131-1207
202010212.206J2131-1207
202010222.277J2131-1207
202010232.193J2131-1207
202010232.185J2131-1207
202010302.170J2131-1207
202109252.252J2131-1207
202111122.185J2131-1207
202111202.235J2131-1207
202112222.134J2131-1207
202202042.124J2131-1207
202202202.244J2131-1207
C-band data (open squares)
201712102.134J2131-1207
201812042.092J2131-1207
201812042.065J2131-1207
201812092.124J2131-1207
201812142.129J2131-1207
201812212.124J2131-1207
201901112.174J2131-1207
201902242.133J2131-1207
201905132.063J2131-1207
201909102.035J2131-1207
201910052.044J2131-1207
202012232.044J2131-1207
202112222.025J2131-1207
X-band data (X-crosses)
201802251.820J2131-1207
201802251.824J2131-1207
201812041.838J2131-1207
201812041.820J2131-1207
201812091.856J2131-1207
201812141.872J2131-1207
201812211.878J2131-1207
201901112.082J2131-1207
201902241.884J2131-1207
201905131.818J2131-1207
201909101.830J2131-1207
201910051.820J2131-1207
202112221.863J2131-1207
U-band data (filled squares)
201812041.529J2131-1207
201812091.507J2131-1207
201812141.591J2131-1207
201812211.583J2131-1207
201901111.956J2131-1207
201902241.692J2131-1207
201905131.602J2131-1207
201909101.624J2131-1207
201910051.578J2131-1207
202112221.686J2131-1207
K-band data (open circles)
201812041.295J2131-1207
201901191.301J2131-1207
201902241.446J2131-1207
202112221.546J2131-1207
A-band data (6-pointed stars)
201809291.010J2131-1207
201810071.014J2131-1207
201810251.004J2131-1207
201810261.009J2131-1207
201812041.081J2131-1207
201901191.078J2131-1207
202104011.634J2131-1207
202112221.546J2131-1207
Q-band data (filled circles)
202112221.492J2131-1207