VLA calibrator information for 0542+4951

This page summarizes the information for 0542+4951 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
 ===================================================================
 0542+498   J2000  A 05h42m36.137916s  49d51'07.233560"  Aug01  3C147  
 0538+498   B1950  A 05h38m43.517500s  49d49'42.837000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  90cm    P  S S S S      52.3
  20cm    L  X S P P      22.5                        50
   6cm    C  X X S P       7.94                       50
 3.7cm    X  X X S P       4.84                       50
   2cm    U  X X X S       2.78                       50
 0.7cm    Q  X ? ? ?       0.91

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)
20170820	1.016	0542+498=3C147
20171024	20.951	0542+498=3C147
20171107	20.678	0542+498=3C147
20171203	21.648	0542+498=3C147
20181117	1.476	3C147
20181223	20.959	3C147
20190823	20.367	0542+498=3C147
S-band data (filled triangles)
20170820	1.022	0542+498=3C147
20171024	11.844	0542+498=3C147
20171107	11.732	0542+498=3C147
20171203	12.031	0542+498=3C147
20190811	11.263	0542+498=3C147
20210727	12.043	3C147
20210822	12.150	3C147
C-band data (open squares)
20170820	1.041	0542+498=3C147
20171024	6.302	0542+498=3C147
20171107	6.188	0542+498=3C147
20171111	6.282	0542+498=3C147
20171203	6.604	0542+498=3C147
20201231	5.808	0542+498
20210106	5.972	J0542+4951
20210119	5.481	J0542+4951
20210302	5.862	J0542+4951
X-band data (X-crosses)
20171024	3.990	0542+498=3C147
20171107	3.928	0542+498=3C147
20171203	4.175	0542+498=3C147
20210103	3.351	J0542+4951
20210104	3.308	J0542+4951
20220807	3.997	J0542+4951