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Compass and Scale Image of Perseus Cluster Dwarf Galaxies

Compass and Scale Image of Perseus Cluster Dwarf Galaxies

About the Object

  • Constellation
    ConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.
    Pegasus
  • 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.
    250 million light-years (77 megaparsecs)
  • Dimensions
    DimensionsThe physical size of the object or the apparent angle it subtends on the sky.
    Each individual galaxy image is 25 arcseconds (30,000 light-years or 9,200 parsecs) wide.

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.
    This image was created from HST data from proposal 10210: C. Conselice (University of Nottingham, U.K.), S. De Rijcke (University of Ghent, Belgium), and E. Held (Astronomical Observatory of Padua, Italy). The science team comprises: S. Penny and C. Conselice (University of Nottingham, U.K.), S. De Rijcke (University of Ghent, Belgium), and E. Held (Astronomical Observatory of Padua, Italy).
  • Instrument
    InstrumentThe science instrument used to produce the data.
    HST>ACS/WFC
  • Exposure Dates
    Exposure DatesThe date(s) that the telescope made its observations and the total exposure time.
    January and February 2005, Exposure Time: 13 hours
  • Filters
    FiltersThe camera filters that were used in the science observations.
    F814W (I) and F555W (V)
  • Object Description
    Object DescriptionThe type of astronomical object.
    Dwarf Galaxies
  • Release Date
    March 12, 2009
  • Science Release
    Hubble Provides New Evidence for Dark Matter Around Small Galaxies
    Read the release
  • Credit
    Illustration: NASA, ESA, and Z. Levay (STScI); Science: NASA, ESA, and C. Conselice (University of Nottingham)

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Compass and Scale Image of Perseus Cluster Dwarf Galaxies
Color Info
Color InfoA brief description of the methods used to convert telescope data into the color image being presented.

The image is a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: Yellow: F814W (I) Blue: F555W (V)

Compass and Scale
Compass and ScaleAn astronomical image with a scale that shows how large an object is on the sky, a compass that shows how the object is oriented on the sky, and the filters with which the image was made.

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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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