VLA calibrator information for 0541-0541

This page summarizes the information for 0541-0541 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
 ===================================================================
 0541-056   J2000  A 05h41m38.083384s -05d41'49.428390"  Aug01         
 0539-057   B1950  A 05h39m10.994600s -05d43'15.028000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  S S S S       1.05
   6cm    C  P P P P       1.25
 3.7cm    X  P P P P       0.98
   2cm    U  P P P P       1.30
 0.7cm    Q  W W W W       0.7

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)
20190726	0.839	J0541-0541
20190911	1.065	J0541-0541
S-band data (filled triangles)
20171215	1.011	J0541-0541
C-band data (open squares)
20210118	0.587	J0541-0541
20210929	0.653	J0541-0541
20220415	0.617	J0541-0541
20220701	0.755	J0541-0541
20220702	0.751	J0541-0541
X-band data (X-crosses)
20180225	1.894	J0541-0541
20180225	2.466	J0541-0541
20180321	0.881	J0541-0541
20210104	0.601	J0541-0541
20210115	0.504	J0541-0541
20220316	0.650	J0541-0541
U-band data (filled squares)
20201228	0.505	J0541-0541
20220331	0.770	J0541-0541
20220402	0.795	J0541-0541
20230314	0.506	J0541-0541
20230402	0.565	J0541-0541
20230417	0.520	J0541-0541
K-band data (open circles)
20170611	0.297	J0541-0541
20170817	0.582	J0541-0541
20180910	0.432	J0541-0541
20180913	0.429	J0541-0541
20180914	0.420	J0541-0541
20180915	0.403	J0541-0541
20180916	0.415	J0541-0541
20180917	0.457	J0541-0541
20180918	0.472	J0541-0541
20180921	0.442	J0541-0541
20180923	0.442	J0541-0541
20180924	0.452	J0541-0541
20181002	0.419	J0541-0541
20181004	0.417	J0541-0541
20181005	0.447	J0541-0541
20181006	0.482	J0541-0541
20181008	0.487	J0541-0541
20181025	0.466	J0541-0541
20181130	0.618	J0541-0541
20190311	0.452	J0541-0541
20190323	0.481	J0541-0541
20190330	0.432	J0541-0541
20190420	0.444	J0541-0541
20190423	0.450	J0541-0541
20190609	0.390	J0541-0541
20190611	0.377	J0541-0541
20190616	0.407	J0541-0541
20190623	0.401	J0541-0541
20190715	0.414	J0541-0541
20190720	0.382	J0541-0541
20220315	0.753	J0541-0541
A-band data (6-pointed stars)
20170817	0.458	J0541-0541
20201227	0.411	J0541-0541
20210103	0.462	J0541-0541
20210105	0.481	J0541-0541
20210112	0.447	J0541-0541
Q-band data (filled circles)
20170817	0.434	J0541-0541
20181127	0.549	J0541-0541
20181127	0.531	J0541-0541
20181128	0.504	J0541-0541
20210207	0.435	J0541-0541
20210224	0.461	J0541-0541
20211004	0.504	J0541-0541
20211011	0.518	J0541-0541
20211021	0.539	J0541-0541
20220814	0.539	J0541-0541