|
Collection:
|
|
NASA Solarsystem Collection
Collection
NASA Solarsystem Collection
Collection
|
|
title:
|
|
Pluto and Charon
title
Pluto and Charon
title
|
|
description:
|
|
This is the clearest view yet of the distant planet Pluto and its moon, Charon, as revealed by NASA's Hubble Space Telescope (HST). The image was taken by the European Space Agency's Faint Object Camera on February 21, 1994 when the planet was 4.4 billion kilometers (2.6 billion miles) from Earth, or nearly 30 times the separation between Earth and the Sun.
Hubble's corrected optics show the two objects as clearly separate and sharp disks. This now allows astronomers to measure directly (to within about 1 percent) Pluto's diameter of 1440 miles (2320 kilometers) and Charon's diameter of 790 miles (1270 kilometers).
The Hubble observations show that Charon is bluer than Pluto. This means that both worlds have different surface composition and structure. A bright highlight on Pluto suggests it has a smoothly reflecting surface layer.
A detailed analysis of the Hubble image also suggests there is a bright area parallel to the equator on Pluto. This result is consistent with surface brightness models based on previous ground-based photometric observations. However, subsequent HST observations will be required to confirm whether the feature is real.
Though Pluto was discovered in 1930, Charon wasn't detected until 1978. That is because the moon is so close to Pluto that the two worlds are typically blurred together when viewed through ground-based telescopes. (If our moon were as close to Earth, it would be as big in the night sky as an apple held at arm's length). The new HST image was taken when Charon was near its maximum elongation from Pluto of .9 arc seconds. The two worlds are 12,200 miles apart (19,640 kilometers).
Hubble's ability to distinguish Pluto's disk at a distance of 2.6 billion miles (4.4 billion kilometers) is equivalent to seeing a baseball at a distance of 40 miles (64 kilometers).
Pluto typically is called the double planet because Charon is half the diameter of Pluto (our Moon is one-quarter the diameter of Earth).
*Image Credit*: Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility; NASA
description
This is the clearest view yet of the distant planet Pluto and its moon, Charon, as revealed by NASA's Hubble Space Telescope (HST). The image was taken by the European Space Agency's Faint Object Camera on February 21, 1994 when the planet was 4.4 billion kilometers (2.6 billion miles) from Earth, or nearly 30 times the separation between Earth and the Sun.
Hubble's corrected optics show the two objects as clearly separate and sharp disks. This now allows astronomers to measure directly (to within about 1 percent) Pluto's diameter of 1440 miles (2320 kilometers) and Charon's diameter of 790 miles (1270 kilometers).
The Hubble observations show that Charon is bluer than Pluto. This means that both worlds have different surface composition and structure. A bright highlight on Pluto suggests it has a smoothly reflecting surface layer.
A detailed analysis of the Hubble image also suggests there is a bright area parallel to the equator on Pluto. This result is consistent with surface brightness models based on previous ground-based photometric observations. However, subsequent HST observations will be required to confirm whether the feature is real.
Though Pluto was discovered in 1930, Charon wasn't detected until 1978. That is because the moon is so close to Pluto that the two worlds are typically blurred together when viewed through ground-based telescopes. (If our moon were as close to Earth, it would be as big in the night sky as an apple held at arm's length). The new HST image was taken when Charon was near its maximum elongation from Pluto of .9 arc seconds. The two worlds are 12,200 miles apart (19,640 kilometers).
Hubble's ability to distinguish Pluto's disk at a distance of 2.6 billion miles (4.4 billion kilometers) is equivalent to seeing a baseball at a distance of 40 miles (64 kilometers).
Pluto typically is called the double planet because Charon is half the diameter of Pluto (our Moon is one-quarter the diameter of Earth).
*Image Credit*: Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility; NASA
description
|
|
date:
|
|
02.21.1994
|
|
keywords:
|
|
Solar System Exploration
keywords
Solar System Exploration
keywords
|
|
keywords:
|
|
SSE
|
|
keywords:
|
|
Space
|
|
keywords:
|
|
NASA
|
|
keywords:
|
|
National Aeronautics and Space Administration
keywords
National Aeronautics and Space Administration
keywords
|
|
keywords:
|
|
JPL
|
|
keywords:
|
|
Jet Propulsion Laboratory
keywords
Jet Propulsion Laboratory
keywords
|
|
keywords:
|
|
Planets
keywords
Planets
keywords
|
|
facet_what:
|
|
Earth
facet_what
Earth
facet_what
|
|
facet_what:
|
|
Moon
facet_what
Moon
facet_what
|
|
facet_what:
|
|
Sun
facet_what
Sun
facet_what
|
|
facet_what:
|
|
Pluto
facet_what
Pluto
facet_what
|
|
facet_what:
|
|
Charon
facet_what
Charon
facet_what
|
|
facet_what:
|
|
ESO
facet_what
ESO
facet_what
|
|
facet_what:
|
|
Faint Object Camera
facet_what
Faint Object Camera
facet_what
|
|
facet_what:
|
|
Hubble Space Telescope (HST)
facet_what
Hubble Space Telescope (HST)
facet_what
|
|
facet_where:
|
|
Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
|
|
facet_where:
|
|
Pluto
facet_where
Pluto
facet_where
|
|
facet_where:
|
|
Charon
facet_where
Charon
facet_where
|
|
facet_where:
|
|
Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
|
|
facet_when:
|
|
1930
facet_when
1930
facet_when
|
|
facet_when:
|
|
February 21, 1994
facet_when
February 21, 1994
facet_when
|
|
facet_when:
|
|
1440
facet_when
1440
facet_when
|
|
facet_when:
|
|
02-21-1994
facet_when
02-21-1994
facet_when
|
|
facet_when_year:
|
|
1930
facet_when_year
1930
facet_when_year
|
|
facet_when_year:
|
|
1994
facet_when_year
1994
facet_when_year
|
|
facet_when_year:
|
|
1440
facet_when_year
1440
facet_when_year
|
|
UID:
|
|
SPD-SLRSY-2100
|
|
original url:
|
original_url
original url
|
