VLA calibrator information for 2253+1608

This page summarizes the information for 2253+1608 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
 ===================================================================
 2253+161   J2000  A 22h53m57.747932s  16d08'53.560890"  Aug01  3C454.3
 2251+158   B1950  A 22h51m29.519700s  15d52'54.348000"
 -----------------------------------------------------
 BAND        A B C D    FLUX(Jy)    UVMIN(kL)  UVMAX(kL)
 =====================================================
  90cm    P  X S S X         15            1           7
  20cm    L  X X S S      10.00                        7
   6cm    C  P P S S      10.00
 3.7cm    X  P P P P      10.90
   2cm    U  P P P P      15.00
 0.7cm    Q  S S S S      17.1

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)
2019082915.804J2253+1608
2019090815.937J2253+1608
S-band data (filled triangles)
2017052916.695J2253+1608
2019082717.058J2253+1608
2019090817.454J2253+1608
2019091116.863J2253+1608
2019091617.346J2253+1608
2019092116.275J2253+1608
2019092217.081J2253+1608
2019093016.467J2253+1608
C-band data (open squares)
2017122119.245J2253+1608
2018041616.709J2253+1608
2019082719.489J2253+1608
2019091118.745J2253+1608
2019091617.912J2253+1608
2019092118.516J2253+1608
2019092218.561J2253+1608
2021030214.361J2253+1608
X-band data (X-crosses)
2018022517.165J2253+1608
2018022517.205J2253+1608
2020060115.347J2253+1608
2021022812.954J2253+1608
2021042512.824J2253+1608
U-band data (filled squares)
2021030611.695J2253+1608
K-band data (open circles)
2018091917.294J2253+1608
2019032417.634J2253+1608
2020022713.294J2253+1608
202107208.530J2253+1608
202107258.435J2253+1608
202107308.443J2253+1608
A-band data (6-pointed stars)
2018092413.133J2253+1608
2018092513.246J2253+1608
2018100712.754J2253+1608
2018101012.688J2253+1608
2019032213.803J2253+1608
2019033015.137J2253+1608
2019041416.183J2253+1608
2019052918.450J2253+1608
2019061618.262J2253+1608
201908254.647J2253+1608
201909124.745J2253+1608
201909134.559J2253+1608
201909194.513J2253+1608
201909194.696J2253+1608
201909264.518J2253+1608
201910084.640J2253+1608
201910124.249J2253+1608
Q-band data (filled circles)
201712308.421J2253+1608
202104027.577J2253+1608