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HST PHAT Detail of M31

HST PHAT Detail of M31

About the Object

  • R.A. Position
    R.A. PositionRight ascension – analogous to longitude – is one component of an object's position.
    00h 42m 44.0s
  • Dec. Position
    Dec. PositionDeclination – analogous to latitude – is one component of an object's position.
    41° 16' 8.99"
  • Constellation
    ConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.
    Andromeda
  • 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.
    About 2.5 million light-years (0.8 megaparsecs)

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.

    The Panchromatic Hubble Andromeda Treasury (PHAT) survey of M31 is an ongoing HST Treasury proposal. These inset images were created from Hubble data from proposal 12058 (PI: J. Dalcanton, University of Washington, Seattle).

  • Instrument
    InstrumentThe science instrument used to produce the data.
    HST>WFC3/UVIS, HST>WFC3/IR, and HST>ACS/WFC
  • Exposure Dates
    Exposure DatesThe date(s) that the telescope made its observations and the total exposure time.
    2010 and 2011
  • Filters
    FiltersThe camera filters that were used in the science observations.
    WFC3/UVIS: F275W (UV) and F336W (U)ACS/WFC: F475W (g) and F814W (I)
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    M31, NGC 224, Andromeda Galaxy detail
  • Object Description
    Object DescriptionThe type of astronomical object.
    PHAT Treasury Survey Region of M31
  • Release Date
    January 11, 2012
  • Science Release
    Rare Ultra-blue Stars Found in Neighboring Galaxy’s Hub
    Read the release
  • Credit
    NASA, ESA, Benjamin Williams (UWashington), Julianne Dalcanton (UWashington)

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HST PHAT Detail of M31
Color Info
Color InfoA brief description of the methods used to convert telescope data into the color image being presented.

This image is a composite of separate exposures acquired by the WFC3 and ACS instruments on HST. Several filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:Detail M31 Image (at bottom)Light purple: F275W (UV)Blue: F336W (U)Green: F475W (g)Dark red: F814W (I)

Related Images & Videos

At left is a view of the entire Andromeda galaxy. On the right are two images that show sections of the galaxy.

Hubble Observes Blue Stars in Andromeda's Core

The image at left shows the nearby, majestic Andromeda galaxy. The rectangular box marks the region probed by NASA's Hubble Space Telescope. Hubble's view, taken with the Wide Field Camera 3 and the Advanced Camera for Surveys, is shown in the images on the right. The images are...

Ground-based Image of Andromeda Galaxy, M31

Ground-based Image of Andromeda Galaxy, M31

This image of the Andromeda galaxy was taken on Jan. 13, 2001, with the WIYN/KPNO 0.9-meter Mosaic I by T. Rector and B. Wolpa of the National Optical Astronomy Observatory in Tucson, Ariz.

HST PHAT Wide Image of M31

HST PHAT Wide Image of M31

Compass and Scale Image of M31

Compass and Scale Image of M31

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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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