VLA calibrator information for 0909+0121

This page summarizes the information for 0909+0121 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
 ===================================================================
 0909+013   J2000  A 09h09m10.091597s  01d21'35.617650"  Aug01         
 0906+015   B1950  A 09h06m35.181600s  01d33'48.129000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  S S X X       0.80           30
   6cm    C  P P P P       1.30
 3.7cm    X  P P P P       0.88
   2cm    U  P P P P       1.40
 0.7cm    Q  W W W W       0.5

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)
20180409	1.455	J0909+0121
20190913	1.606	J0909+0121
C-band data (open squares)
20171204	1.614	J0909+0121
20190216	1.576	J0909+0121
20190216	1.592	J0909+0121
20201211	1.115	J0909+0121
20210101	1.181	J0909+0121
20210103	1.171	J0909+0121
20210105	1.185	J0909+0121
20210105	1.172	J0909+0121
20210110	1.165	J0909+0121
20220601	0.982	J0909+0121
X-band data (X-crosses)
20180225	1.578	J0909+0121
20180225	1.582	J0909+0121
20180415	1.815	J0909+0121
20180422	1.715	J0909+0121
20190314	1.368	J0909+0121
20190830	1.091	J0909+0121
20200512	1.074	J0909+0121
20201213	1.070	J0909+0121
20201215	1.044	J0909+0121
20201216	1.052	J0909+0121
20201222	1.038	J0909+0121
20201223	1.042	J0909+0121
20201227	1.043	J0909+0121
20201229	1.036	J0909+0121
20210411	1.030	J0909+0121
20210417	1.016	J0909+0121
20210419	1.014	J0909+0121
20210419	0.998	J0909+0121
20210914	1.016	J0909+0121
A-band data (6-pointed stars)
20171003	1.056	J0909+0121
20171008	1.108	J0909+0121
20171008	1.027	J0909+0121
20171009	1.076	J0909+0121
20171012	1.096	J0909+0121
20171014	1.070	J0909+0121
20171014	1.093	J0909+0121
20171015	1.103	J0909+0121
20171017	1.070	J0909+0121
20171020	1.089	J0909+0121
20171020	1.110	J0909+0121
20171024	1.111	J0909+0121
20180426	1.250	J0909+0121
20180509	1.322	J0909+0121
20200210	0.875	J0909+0121
20200217	0.873	J0909+0121