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Compass Scale Image of V1 in M31

Compass and scale image titled "Cepheid Variable Star V1 in M31 HST WFC3/UVIS." Four boxes each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date.

Compass and scale image titled "Cepheid Variable Star V1 in M31 HST WFC3/UVIS." Four boxes each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date.

About the Object

  • R.A. Position
    R.A. PositionRight ascension – analogous to longitude – is one component of an object's position.
    00h 41m 26.99s
  • Dec. Position
    Dec. PositionDeclination – analogous to latitude – is one component of an object's position.
    41° 10' 6.0"
  • 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 image was created from Hubble data from proposal 12326: K. Noll (PI), Z. Levay, M. Mutchler, T. Borders, L. Frattare, M. Livio, C. Christian, D. Soderblom, and H. Bond (Hubble Heritage Team/STScI). Note:The Hubble Space Telescope observations of Hubble's Variable M31-V1 were made possible from ground-based data provided by the American Association of Variable Star Observers (AAVSO).

  • Instrument
    InstrumentThe science instrument used to produce the data.
    HST>WFC3/UVIS
  • Exposure Dates
    Exposure DatesThe date(s) that the telescope made its observations and the total exposure time.
    December 2010 - January 2011, Exposure Time: 1.7 hours
  • Filters
    FiltersThe camera filters that were used in the science observations.
    F475X (Wide Blue) and F600LP (Long Pass)
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    M31-V1
  • Object Description
    Object DescriptionThe type of astronomical object.
    Cepheid Variable Star V1 in M31
  • Release Date
    January 15, 2025
  • Science Release
    NASA Celebrates Edwin Hubble’s Discovery of a New Universe
    Read the release
  • Credit
    Image: NASA, ESA, Hubble Heritage Project

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Compass and scale image titled "Cepheid Variable Star V1 in M31 HST WFC3/UVIS." Four boxes each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date.
Color Info
Color InfoA brief description of the methods used to convert telescope data into the color image being presented.

NASA, ESA, and the Hubble Heritage Team (STScI/AURA); Illustration Credit: NASA, ESA, and Z. Levay (STScI)

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.

Related Images & Videos

A Hubble image of the Andromeda galaxy, tilted from the bottom left to top right. The outer edges of the galaxy are blue, while the inner two-thirds is yellowish with a bright, central core. Four inset boxes form an arc along the top portion of the galaxy, each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date. An arrow from galaxy's right center spiral arm points to the boxes, indicating where the star originates in the galaxy.

M31 Cepheid Variable Star V1

In commemoration of Edwin Hubble's discovery of a Cepheid variable class star, called V1, in the neighboring Andromeda galaxy 100 years ago, astronomers partnered with the American Association of Variable Star Observers (AAVSO) to study the star. AAVSO observers followed V1 for...

A Hubble image of the Andromeda galaxy, tilted from the bottom left to top right. The outer edges of the galaxy are blue, while the inner two-thirds is yellowish with a bright, central core. Four inset boxes form an arc along the top portion of the galaxy, each showing a bright white star in the center surrounded by other stars. Each box has a correlating date at the bottom: Dec. 17, 2020, Dec. 21, 2010, Dec. 30, 2019, and Jan. 26, 2011. The center star in the boxes appears brighter with each passing date. An arrow from galaxy's right center spiral arm points to the boxes, indicating where the star originates in the galaxy.

Cepheid Variable Star V1 in Andromeda Galaxy

In commemoration of Edwin Hubble's discovery of a Cepheid variable class star, called V1, in the neighboring Andromeda galaxy 100 years ago, astronomers partnered with the American Association of Variable Star Observers (AAVSO) to study the star. AAVSO observers followed V1 for...

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Details

Last Updated
Mar 18, 2025
Contact
Media

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

Image Credit

NASA, ESA, Hubble Heritage Project

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