VLA calibrator information for 0956+2515

This page summarizes the information for 0956+2515 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
 ===================================================================
 0956+252   J2000  A 09h56m49.875361s  25d15'16.049770"  Aug01         
 0953+254   B1950  A 09h53m59.738500s  25d29'33.586000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  20cm    L  P P S X       0.90            6
   6cm    C  P P P P       1.50
 3.7cm    X  P P P P       2.08
   2cm    U  S S S S       0.90
 0.7cm    Q  S S S S       0.8

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)
201706180.538J0956+2515
201903080.545J0956+2515
201906030.519J0956+2515
201908230.503J0956+2515
201908240.500J0956+2515
201908250.498J0956+2515
201908260.492J0956+2515
201908270.490J0956+2515
201908290.479J0956+2515
201908300.479J0956+2515
201908310.479J0956+2515
201909010.477J0956+2515
201909150.471J0956+2515
201909170.492J0956+2515
201909230.520J0956+2515
201910060.527J0956+2515
202305020.587J0956+2515
202305050.577J0956+2515
S-band data (filled triangles)
201708210.511J0956+2515
201904190.697J0956+2515
201908230.639J0956+2515
201908300.620J0956+2515
201909170.635J0956+2515
201909260.643J0956+2515
201910010.617J0956+2515
202111300.807J0956+2515
C-band data (open squares)
201706180.712J0956+2515
201708210.805J0956+2515
201711140.926J0956+2515
201908300.677J0956+2515
201909170.705J0956+2515
201909260.693J0956+2515
202102090.887J0956+2515
202206090.710J0956+2515
202206270.680J0956+2515
X-band data (X-crosses)
201802101.417J0956+2515
201802191.520J0956+2515
201908060.732J0956+2515
201909010.657J0956+2515
202104100.910J0956+2515
202104220.990J0956+2515
202208130.611J0956+2515
U-band data (filled squares)
202101111.112J0956+2515
202206240.585J0956+2515
K-band data (open circles)
201706141.779J0956+2515
201812030.932J0956+2515