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UFD Galaxy Leo IV Compass and Scale Image
About the Object
- R.A. PositionR.A. PositionRight ascension – analogous to longitude – is one component of an object's position.11h 32m 56.99s
- Dec. PositionDec. PositionDeclination – analogous to latitude – is one component of an object's position.00° 31' 59.98"
- ConstellationConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.Leo
- DistanceDistanceThe 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.500,000 light-years (150,000 parsecs)
About the Data
- Data DescriptionData 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 12549: T. Brown (STScI), et al. The science team comprises T. Brown and J. Tumlinson (STScI), M. Geha (Yale University), E. Kirby (California Institute of Technology), D. VandenBerg (University of Victoria), R. Munoz (Universidad de Chile), J. Kalirai (STScI), J. Simon (Observatories of the Carnegie Institute of Washington), R. Avila (STScI), P. Guhathakurta (UCO/Lick Observatory), A. Renzini (Osservatorio Astronomico), and H. Ferguson (STScI). - InstrumentInstrumentThe science instrument used to produce the data.HST>ACS/WFC
- Exposure DatesExposure DatesThe date(s) that the telescope made its observations and the total exposure time.January 1, 2012, Exposure Time: 11.4 hours
- FiltersFiltersThe camera filters that were used in the science observations.F606W (V) and F814W (I)
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.Leo IV
- Object DescriptionObject DescriptionThe type of astronomical object.Ultra-Faint Dwarf Galaxy
- Release DateJuly 10, 2012
- Science ReleaseHubble Unmasks Ghost Galaxies
- Credits
This image is a composite of separate exposures acquired by the ACS instrument. Several filters were used to sample various wavelengths. 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: Blue: F606W (V) Orange: F814W (I)
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Details
Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, MD
claire.andreoli@nasa.gov
