VLA calibrator information for 1820-2528

This page summarizes the information for 1820-2528 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
 ===================================================================
 1820-254   J2000  A 18h20m57.848685s -25d28'12.584560"  Aug01         
 1817-254   B1950  A 18h17m52.332200s -25d29'37.400000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  S S X X       1.25           16
   6cm    C  P P P P       1.3            
 3.7cm    X  P P P P       1.31
 0.7cm    Q  W W W W       0.53

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)
201711041.004J1820-2528
201711130.977J1820-2528
201712180.955J1820-2528
201801180.931J1820-2528
201801210.914J1820-2528
201804250.857J1820-2528
201805240.868J1820-2528
201805250.874J1820-2528
201805250.875J1820-2528
201812090.945J1820-2528
201904231.027J1820-2528
201907271.077J1820-2528
201908261.149J1820-2528
201909041.140J1820-2528
201909081.141J1820-2528
201909101.136J1820-2528
201909131.143J1820-2528
201909181.135J1820-2528
201909221.139J1820-2528
201909241.117J1820-2528
201909301.152J1820-2528
201910011.170J1820-2528
201910041.155J1820-2528
201910081.150J1820-2528
201910111.164J1820-2528
201910151.109J1820-2528
201910171.159J1820-2528
C-band data (open squares)
201705270.846J1820-2528
201705290.861J1820-2528
201705300.869J1820-2528
201705310.877J1820-2528
201706050.919J1820-2528
201706110.938J1820-2528
201706150.908J1820-2528
201706180.885J1820-2528
201706200.869J1820-2528
201706220.858J1820-2528
201707050.852J1820-2528
201707060.849J1820-2528
201707090.865J1820-2528
201708040.814J1820-2528
201708210.832J1820-2528
201708220.836J1820-2528
201711040.775J1820-2528
201711130.713J1820-2528
201712180.650J1820-2528
201712230.669J1820-2528
201801180.730J1820-2528
201801210.734J1820-2528
201804130.813J1820-2528
201804250.837J1820-2528
201805150.770J1820-2528
201805230.724J1820-2528
201805240.737J1820-2528
201805240.780J1820-2528
201805250.775J1820-2528
201805250.790J1820-2528
201805290.789J1820-2528
201805290.835J1820-2528
201805300.777J1820-2528
201809090.747J1820-2528
201809100.788J1820-2528
201809120.795J1820-2528
201809240.799J1820-2528
201811090.827J1820-2528
201811090.836J1820-2528
201811150.823J1820-2528
201812090.705J1820-2528
201812090.719J1820-2528
201901170.731J1820-2528
201901180.679J1820-2528
201901200.755J1820-2528
201902170.840J1820-2528
201903290.920J1820-2528
201904230.920J1820-2528
201905300.893J1820-2528
201906010.846J1820-2528
201906040.884J1820-2528
201908020.843J1820-2528
201908260.866J1820-2528
201908260.879J1820-2528
201908310.865J1820-2528
201909040.889J1820-2528
201909080.871J1820-2528
201909100.864J1820-2528
201909130.865J1820-2528
201909180.891J1820-2528
201909220.853J1820-2528
201909240.860J1820-2528
201909240.851J1820-2528
201909250.886J1820-2528
201909260.876J1820-2528
201909300.860J1820-2528
201910010.896J1820-2528
201910040.884J1820-2528
201910080.869J1820-2528
201910110.867J1820-2528
201910170.894J1820-2528
202105071.294J1820-2528
202105111.308J1820-2528
202105151.247J1820-2528
202110281.283J1820-2528
202110311.269J1820-2528
202111021.260J1820-2528
202111041.290J1820-2528
202111061.266J1820-2528
202206291.244J1820-2528
202207281.225J1820-2528
202303111.105J1820-2528
X-band data (X-crosses)
201705220.724J1820-2528
201705260.727J1820-2528
201709040.690J1820-2528
201709070.678J1820-2528
201709100.625J1820-2528
201709300.674J1820-2528
201710110.897J1820-2528
201710130.878J1820-2528
201802190.721J1820-2528
201802250.673J1820-2528
201802250.674J1820-2528
201802260.664J1820-2528
201803200.789J1820-2528
201805220.670J1820-2528
201805230.647J1820-2528
201805240.680J1820-2528
201810090.741J1820-2528
201810180.718J1820-2528
201904110.781J1820-2528
201904230.868J1820-2528
201904240.851J1820-2528
201905070.821J1820-2528
201908260.852J1820-2528
201908280.858J1820-2528
201909030.827J1820-2528
201909060.822J1820-2528
201909090.840J1820-2528
201909160.806J1820-2528
201909230.794J1820-2528
202012011.084J1820-2528
202103091.090J1820-2528
202103151.128J1820-2528
202103181.109J1820-2528
202111241.105J1820-2528
202203081.004J1820-2528
202205071.052J1820-2528
202205201.125J1820-2528
202206191.156J1820-2528
202207021.042J1820-2528
202207040.980J1820-2528
202207041.020J1820-2528
202208021.089J1820-2528
U-band data (filled squares)
201706110.656J1820-2528
201707050.632J1820-2528
201707060.630J1820-2528
201707300.621J1820-2528
201708040.720J1820-2528
201708170.640J1820-2528
201708210.619J1820-2528
201711190.566J1820-2528
201711250.509J1820-2528
201712170.693J1820-2528
201801190.616J1820-2528
201801220.609J1820-2528
201802260.610J1820-2528
201803050.634J1820-2528
201804020.720J1820-2528
201804240.695J1820-2528
201805070.638J1820-2528
201805080.634J1820-2528
201805130.629J1820-2528
201805140.621J1820-2528
201805230.614J1820-2528
201805230.631J1820-2528
201805240.633J1820-2528
201809090.676J1820-2528
201811150.654J1820-2528
201811160.654J1820-2528
201812080.609J1820-2528
201901170.648J1820-2528
201901200.666J1820-2528
201901200.678J1820-2528
201903280.745J1820-2528
201904160.738J1820-2528
201905250.700J1820-2528
201906040.707J1820-2528
201908090.706J1820-2528
K-band data (open circles)
201712090.551J1820-2528
201712150.598J1820-2528
201812090.555J1820-2528
201906040.611J1820-2528
202105110.990J1820-2528
202111160.905J1820-2528
202202130.900J1820-2528
A-band data (6-pointed stars)
201706110.470J1820-2528
201707050.446J1820-2528
201707060.459J1820-2528
201707300.454J1820-2528
201708040.467J1820-2528
201708170.467J1820-2528
201708210.489J1820-2528
201711190.490J1820-2528
201711250.466J1820-2528
201712170.581J1820-2528
201801190.491J1820-2528
201801220.509J1820-2528
201802260.540J1820-2528
201804020.533J1820-2528
201804240.633J1820-2528
201805050.545J1820-2528
201805060.532J1820-2528
201805230.492J1820-2528
201805230.541J1820-2528
201805240.511J1820-2528
201805280.533J1820-2528
201809090.507J1820-2528
201811150.477J1820-2528
201811160.497J1820-2528
201812080.467J1820-2528
201901170.477J1820-2528
201901200.492J1820-2528
201901200.507J1820-2528
201903280.589J1820-2528
201904160.582J1820-2528
201905250.577J1820-2528