Try spectral matching to known magnitudes

or, try your own Digital Synthetic Photometry

Electronic tables for

All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
by Andrew Pickles & Éric Depagne, PASP, 122, 1437, 2010.

Left-click to view, Right-click to download

AllFlx             (98kb)  Listing of synthetic fluxes and magnitudes for 20 calspec standards

SynZero          (16kb)  Synthetic spectrophotometric Zeropoints

LibMags       (36kb)  Synthetic magnitudes, normalized to V=0, for 141 library spectra

LandoltCat     (150kb)  input data for 594 Landolt standards

LandoltFit     (155kb)  fitted data for 594 Landolt standards

LanSloCat     (23kb)  input data for 65 standards common to Landolt & Sloan

LanSloFit     (28kb)  fitted data for 65 standards common to Landolt & Sloan

SloanCat       (40kb)  input data for 158 Sloan standards

SloanFit         (40kb)  fitted data for 158 Sloan standards

SDSSSouthFit.dat   (4Mb)  catalog of ~16,000 Southern Sloan stellar data, fitted types, magnitudes & distances (refitted Dec2010 with fitted 2MASS JHK)

DR7Fit.dat.gz           (440Mb)  catalog of 4.8M SDSS stellar data, fitted types, magnitudes & distances

SDSSPTFit.dat.gz     (85Mb)  catalog of ~1M SDSS PT data, fitted types, magnitudes & distances

Tycho2Fit.dat.gz       (195Mb)  catalog of 2.4M Tycho2 stellar data, fitted types, magnitudes & distances

assm.tar.gz           (720Mb)  gzipped tar file of above tables

findassm.tar           (128kb)  findassm c program(s) to search fitted tables & print out selected fitted mags

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example.findassm             example of findassm output

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README_assm.txt             Readme for all sky spectral matching

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pleiades_5sig             pleiades plus nearby

praesepe_5sig             praesepe plus nearby

please email me if you find these useful