This page displays results from searches for redshiftindependent (metric) distances for individual objects. These distances have been extracted from the published literature and are based on a variety of distance indicators such as Cepheids, RR Lyrae stars, supernovae, etc. These distances are distinct from and independent of expansion rate distances as calculated and displayed in NED's "Basic Data"; the latter depend on a selected value of the Hubble constant, modified by a variety of cosmological and/or local flow model parameters. No attempt has been made to place these distances on a consistent zero point; they are distances as published. For the "Individually Referenced Moduli and Distances" the values are grouped by method and within each group they are sorted by increasing distance modulus. The metric distances complied here were gathered from the literature for NED by the amateur astronomer Ian Steer, working independently from his base in Toronto, Ontario, Canada. The top section of this page displays a Summary Statistics table of NED's distances for the object. The first column gives the mean distance modulus with the standard deviation of the mean, and the minimum and maximum distance moduli, all in magnitudes. The second column of the summary table gives the same information in megaparsecs. The means and standard deviations are calculated by NED from the available distances; no values are rejected. The "Individually Referenced Moduli and Distances" table has the following columns:
The various methods used to determine the distances are coded as follows:
Reference codes are clickable so the original paper may be quickly brought up. The Notes column generally contains an abbreviated note with the details of the distance determination methods. A number usually refers to the number of objects. Object aliases are occasionally given in this column (e.g. the distance for the galaxy SDSS J002414.24001457.2 comes from the Type Ia SN "SDSS 13835"). Abbreviations for most currentlyused Notes are as follows:
