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Compass and Scale Illustration of HCG 90
About the Object
- R.A. PositionR.A. PositionRight ascension – analogous to longitude – is one component of an object's position.22h 2m 5.61s
- Dec. PositionDec. PositionDeclination – analogous to latitude – is one component of an object's position.-31° 58' 0.44"
- ConstellationConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.Piscis Austrinus
- 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.106 million light-years (33 megaparsecs)
- DimensionsDimensionsThe physical size of the object or the apparent angle it subtends on the sky.This image is roughly 3.2 arcminutes (1,000,000 light-years or 31,000 parsecs) wide.
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.This image was created from HST data from proposal 10554: R. Sharples (University of Durham), M. Beasley (University of California, Santa Cruz), J. Blakeslee (Dominion Astrophysical Observatory), S. Zepf and A. Kundu (Michigan State University), and J. Cho (University of Durham). - 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.May 16, 2006, Exposure Time: 1.2 hours
- FiltersFiltersThe camera filters that were used in the science observations.F850LP (z) and F475W (g)
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.Hickson Compact Group 90, HCG 90
- Object DescriptionObject DescriptionThe type of astronomical object.Cluster of Interacting Galaxies
- Release DateMarch 3, 2009
- Science ReleaseTrio of Galaxies Mix It Up
- Credit
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: Red: F850LP (z) Green: F850LP (z) + F475W (g) Blue: F475W (g)
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Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov
