Terzan 12 Compass Image

Terzan 12 Compass Image

This is Hubble Space Telescope's colorful view of globular star cluster Terzan 12. It is a compact beehive-like structure of hundreds of thousands of stars crowded together. Because of scattering by interstellar dust, the stars on the left side of the image appear redder. The stars toward the right side of the image are bluish-white. The image is sprinkled with bright blue foreground stars. There is also a smattering of bright red giant stars across the image.

Credits

Image

NASA, ESA, ESA/Hubble, Roger Cohen (RU)

About The Object
Object Name Terzan 12
Object Description Globular cluster
R.A. Position 18:12:15.80
Dec. Position -22:44:31.00
Constellation Sagittarius
Distance 15,000 light-years
Dimensions 2.17x2.40 arcminutes
About The Data
Data Description The HST observations include those from program: (R. Cohen)
Instrument ACS/WFC, WFC3/UVIS
Exposure Dates 8 August 2016, 13 August 2016
Filters F606W, F110W, F160W
About The Image
Color Info These images are a composite of separate exposures acquired by the The Hubble Space Telescope using the ACS/WFC and UVIS/IR instruments. Several filters were used to sample wide 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: Blue: F606W, Green: F110W, Red: F160W
Compass Image Image titled "Terzan 12 HST ACS & WFC3" with compass arrows, and color key. The image shows a compact beehive-like structure of hundreds of thousands of stars crowded together. Because of scattering by interstellar dust, stars on the left side of the image appear redder. Stars toward the right side of the image are bluish-white. The image is sprinkled with bright blue foreground stars. There's also a smattering of bright red giant stars across the image. At left, near the top of the image is a color key showing the ACS/WFC and WFC3 UVIS/IR instrument filters used to create the image. The assigned colors are blue: F606W; green: F110W; and red: F160W. At lower right are compass arrows indicating the orientation of the image on the sky. The east arrow points toward 10 o'clock; the north arrow points towards 2 o'clock.
About The Object
Object Name A name or catalog number that astronomers use to identify an astronomical object.
Object Description The type of astronomical object.
R.A. Position Right ascension – analogous to longitude – is one component of an object's position.
Dec. Position Declination – analogous to latitude – is one component of an object's position.
Constellation One of 88 recognized regions of the celestial sphere in which the object appears.
Distance The 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.
Dimensions The physical size of the object or the apparent angle it subtends on the sky.
About The Data
Data Description
  • Proposal: 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.
Instrument The science instrument used to produce the data.
Exposure Dates The date(s) that the telescope made its observations and the total exposure time.
Filters The camera filters that were used in the science observations.
About The Image
Image Credit The primary individuals and institutions responsible for the content.
Publication Date The date and time the release content became public.
Color Info A brief description of the methods used to convert telescope data into the color image being presented.
Orientation The rotation of the image on the sky with respect to the north pole of the celestial sphere.

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