Techniques are developed for the automatic measurement of the colors and magnitudes of a complete sample of very faint galaxies. The observations consist of photographic surface photometry in two wavebands for approximately 20,000 galaxies in two widely separated, high-latitude fields, each having an area of approximately 1080 sq arcmin.

Kron (1980) claims that you capture most of the galaxy flux (>90%) if you use an aperture size twice the radius of the first image moment radius. Although not intuitive, he shows evidence that this aperture is applicable (re: robust) to different galaxy (morph) types, including spirals and …

Authors: Kron, R. G. Journal: Astrophysical Journal Supplement Series, vol. 43, June 1980, p. 305-325. Research supported by the University of California Bibliographic Code: 1980ApJS...43..305K

2017年12月19日 · The Kron 1980 paper shows how to define a nominal magnitude for an extended object on the basis of the shape of the light profile. In the PanSTARRS implementation, the definition of the Kron radius and Kron magnitude is carried out as follows:

We present the results of an unbiased search for Lyα emission from continuum-selected 5.6 < z < 8.7 galaxies. Our data set consists of 160 orbits of G102 slitless grism spectroscopy obtained with the… We present a 0.4–8 μm multi-wavelength photometric catalog in …

2019年2月6日 · PSF, aperture, and Kron (1980) photometry are included, along with sky and detector coordinate positions. References: Kron, R. G. 1980, ApJS, 43, 305. ForcedWarpExtended : Contains the single epoch forced photometry fluxes within the SDSS R5 (r = 3.00 arcsec), R6 (r = 4.63 arcsec), and R7 (r = 7.43 …

2022年1月20日 · Description: Contains single epoch photometry of individual detections from a single exposure. The identifiers connecting the detection back to the original image and to the object association are provided. PSF, aperture, and Kron (1980) photometry are included, along with sky and detector coordinate positions.

2019年5月2日 · The Kron radius is defined as the first moment of the surface brightness light profile. Kron (1980) argued that apertures of multiple values of the Kron radius, Rk (typically, Rk = 2 or Rk = 2.5) would contain a sufficient amount of the total flux of the galaxy to be a useful measure of total flux.

For each object we present total Kron (1980) magnitudes and aperture photometry. As an example, we use these data to derive color-magnitude relations for Coma early-type galaxies, measure the intrinsic scatter of these relations and its dependence on galaxy mass, and address the issue of color gradients.

Kron is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Kron as potentially hazardous because its orbit does not bring it close to Earth. Kron orbits the sun every 1,570 days (4.30 years), coming as close as 2.35 AU and reaching as far as 2.94 AU from the sun.