July 2021 Release Highlights

Database Contents

Tabular summaries of NED's current holdings are presented here. Graphic summaries are presented here.

Newly automated procedure to assign fiducial redshifts: Many objects in NED have multiple redshift measurements, and the fiducial (preferred) redshifts that appear in each object’s Overview and in multi-object search result tables have historically been chosen by human experts during the data ingestion process. However, due to the dramatic increase in redshift measurements appearing in sky survey catalogs and in the astrophysical literature, a new automated decision tree algorithm has been implemented. This has resulted in thousands of updates to previous selections, as well as over 879,000 objects that previously had no assigned fiducial redshift. Further information is available here.

References and Object Pointers

1,672,972 new object links (pointers) to 676 new references including:

  • 4,415 AKARI/IRC sources from AKARI/IRC source catalogues and source counts for the IRAC Dark Field, ELAIS North and the AKARI Deep Field South (Davidge, H. et al., 2017MNRAS.472.4259D )
  • 5,065 4FGL gamma-ray sources from Fermi Large Area Telescope Fourth Source Catalog (Abdollahi, S. et al., 2020ApJS..247...33A )
  • 1,342 9Y-MST (9-year Fermi-LAT Minimum Spanning Tree) gamma-ray sources from A MST catalogue of gamma-ray source candidates above 10 GeV and at Galactic latitudes higher than 20 degrees (Campana, R. et al., 2018A&A...619A..23C )
  • 2,480 more GLEAM (GaLactic and Extragalactic All-sky Murchison Widefield Array) radio sources from Interplanetary scintillation studies with the Murchison Widefield Array - II. Properties of sub-arcsecond compact sources at low radio frequencies (Chhetri, R. et al., 2018MNRAS.474.4937C )
  • 2,070 galaxies and 462 compact galaxy groups from Improving Hickson-like compact group finders in redshift surveys (Diaz-Gimenez, E. et al., 2018A&A...618A.157D )
  • 925 Lyman-Alpha Break and lensed galaxies from Size-Luminosity Relations and UV Luminosity Functions at z = 6-9 Simultaneously Derived from the Complete Hubble Frontier Fields Data (Kawamata, R. et al., 2018ApJ...855....4K )
  • 879 galaxies and redshifts from the VIMOS survey of the CANDELS CDFS and UDS fields The VANDELS ESO public spectroscopic survey: Observations and first data release (Pentericci, L et al., 2018A&A...616A.174P )
  • 833 500R (500 µm risers) and 145 SD850 (SPIRE drop-outs) infrared sources from A Systematic Search for the Reddest Far-infrared and Submillimeter Galaxies (Yan, H. et al., 2020ApJS..249....1Y )
  • 1,235 Supernovae through February 2021 from ASASSN, Transient Name Server, and Supernova Legacy Survey

Cross-IDs and New Objects

  • 79,881 sources from the literature cross-identified with NED objects
  • 15,312 new NED objects including galaxies, quasars, clusters of galaxies, supernovae, globular clusters as well as unidentified radio, visual, infrared, X-ray, and gamma-ray sources.


59,470 additional redshifts including:

  • 5,415 redshifts for x-ray sources from The Chandra Deep Wide-field Survey A New Chandra Legacy Survey in the Boötes Field (Masini, A. et al., 2020ApJS..251....2M )
  • 1,036 redshifts from The HectoMAP Cluster Survey (Sohn, J. et al., 2018ApJ...855..100S )
879,266 more objects now have fiducial (preferred) redshifts after implementation of a new automated decision tree.


888,494 new photometric data points integrated into SEDs, including:

  • VIS: HST magnitudes from Crowded Field Galaxy Photometry: Precision Colors in the CLASH Clusters (Connor, Thomas et al., 2017ApJ...848...37C)
  • Radio: VLA fluxes from The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release (Smolcic, V. et al., 2017A&A...602A...1S)
  • X-Ray : MAXI fluxes from The 7-year MAXI/GSC X-Ray Source Catalog in the High Galactic Latitude Sky (3MAXI) (Kawamuro, T. et al., 2018ApJS..238...32K)
  • MM: ALMA fluxes from Demonstrating a New Census of Infrared Galaxies with ALMA (DANCING-ALMA). I. FIR Size and Luminosity Relation at z = 0-6 Revealed with 1034 ALMA Sources (Fujimoto, Seiji et al., 2017ApJ...850...83F)
  • FIR: Herschel fluxes from The Great Observatories All-Sky LIRG Survey: Herschel Image Atlas and Aperture Photometry (Chu, Jason K. et al., 2017ApJS..229...25C)

For highlights in previous releases, please see Archived Release Notes.