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Gravitational Lens Helps Hubble and Keck Discover Galaxy Building Block

Gravitational Lens Helps Hubble and Keck Discover Galaxy Building Block

About the Object

  • Constellation
    ConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.
    Draco
  • Distance
    DistanceThe physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs.
    The lensed galaxy is 4 billion parsecs (13 billion light-years) away. Redshift: z=5.58

About the Data

  • Data Description
    Data DescriptionProposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
    Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.
    Principal Astronomers: J.-P. Kneib (Observatoire Midi-Pyrenees, France), R. Ellis and M. Santos (Caltech) and K. Kuijken (Kapteyn Institute, The Netherlands)
  • Instrument
    InstrumentThe science instrument used to produce the data.
    Keck I>Low Resolution Imaging Spectrograph, HST>WFPC2, and Keck II>Echelle Spectrograph and Imager
  • Exposure Dates
    Exposure DatesThe date(s) that the telescope made its observations and the total exposure time.
    April 23, 2001, Exposure Time: 0.6 hours (Keck I), January 11 - 12, 2000, Exposure Time: 3.3 hours (HST), and May 21, 2001, Exposure Time: 1.1 hours
  • Filters
    FiltersThe camera filters that were used in the science observations.
    Low Resolution Imaging Spectrograph WFPC2: F814 W (I) Echelle Spectrograph and Imager
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    Abell 2218
  • Object Description
    Object DescriptionThe type of astronomical object.
    Gravitational Lensed galaxy
  • Release Date
    October 5, 2001
  • Science Release
    Gravitational Lens Helps Hubble and Keck Discover Galaxy Building Block
    Read the release
  • Credit
    NASA, ESA, Richard Ellis (Caltech) and Jean-Paul Kneib (Observatoire Midi-Pyrenees, France); Acknowledgment: NASA, A. Fruchter and the ERO Team (STScI and ST-ECF)

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Related Images & Videos

Gravitational Lens Helps Hubble and Keck Discover Galaxy Building Block

Gravitational Lens Helps Hubble and Keck Discover Galaxy Building Block

This NASA Hubble Space Telescope image shows a very small, faint galaxy 'building block' newly discovered by a unique collaboration between ground- and space-based telescopes. Hubble and the 10-meter Keck Telescopes in Hawaii joined forces, using a galaxy cluster which acts as...

Galaxy Cluster Abell 2218's "Gravitational Lens"

Galaxy Cluster Abell 2218's "Gravitational Lens"

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Details

Last Updated
Mar 28, 2025
Contact
Media

Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov

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