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News Release Archive:

News Release 325 of 967

June 20, 2007 10:30 AM (EDT)

News Release Number: STScI-2007-27

Hubble Images of Asteroids Help Astronomers Prepare for Spacecraft Visit

Technical facts about this news release:

About the Object
Ceres - January 24, 2004
CERES
Object Name: Ceres, 1 Ceres
Object Description: Minor Body in the Main Asteroid Belt
Distance: The semi-major axis of Ceres' orbit about the Sun is 2.77 Astronomical Units (A.U.) or roughly 257 million miles (414 million kilometers). At the time of the Hubble observations, Ceres was roughly 1.63 A.U. from Earth.
Dimensions: Ceres is has a mean diameter of approximately 590 miles (950 kilometers). The object has a 974.6 km diameter at the equator and a slightly smaller diameter (909.4 km) pole-to-pole.
About the Data
Data Description:

This image was created from data from the HST proposal 9748: J. Parker (Southwest Research Institute), L. McFadden (University of Maryland), C. Russell (University of California, Los Angeles), A. Stern (Southwest Research Institute), M. Sykes (University of Arizona), P. Thomas (Cornell University) and E. Young (Southwest Research Institute).

The science team includes J. Parker (Southwest Research Institute), P. Thomas (Cornell University), L. McFadden (University of Maryland, College Park), and M. Mutchler and Z. Levay (Space Telescope Science Institute).

Instrument: ACS/HRC
Exposure Date(s): December 2003 - January 2004
Filters: F330W (U) and F555W (V)
About the Image
Image Credit: NASA, ESA, and J. Parker (Southwest Research Institute)
Color/Scale: This image is a composite of many separate exposures made by the ACS HRC instrument on the Hubble Space Telescope using several different filters. 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:
F330W (U) blue
F555W (V) red/orange
Orientation: Ceres - January 24, 2004

About the Object
Vesta - May 14, 2007
VESTA
Object Name: Vesta, 4 Vesta
Object Description: Minor Body in the Main Asteroid Belt
Distance: The semi-major axis of Vesta's orbit about the Sun is 2.36 Astronomical Units (A.U.) or roughly 219 million miles (353 million kilometers). At the time of the Hubble observations, Vesta was roughly 1.2 A.U. from Earth.
Dimensions: Vesta is has a mean diameter of approximately 330 miles (530 kilometers). The object has a 354 mile (570 km) diameter at the equator and a slightly smaller diameter 288 miles (464 km) pole-to-pole.
About the Data
Data Description:

This image was created from data from the HST proposal 10799: L. McFadden and J.Y. Li (University of Maryland, College Park), M. Sykes (University of Arizona), P. Thomas (Cornell University), C. Russell (University of California, Los Angeles), and J. Parker and E. Young (Southwest Research Institute).

The science team includes L. McFadden and J.Y. Li (University of Maryland, College Park), M. Mutchler and Z. Levay (Space Telescope Science Institute), P. Thomas (Cornell University), J. Parker and E. Young (Southwest Research Institute), and C. Russell and B. Schmidt (University of California, Los Angeles).

Instrument: WFPC2
Exposure Date(s): May 14 - 16, 2007
Filters: F439W (B) and F673N ([SII])
About the Image
Image Credit: NASA, ESA, and L. McFadden (University of Maryland)
Color: This image is a composite of many separate exposures made by the WFPC2 instrument on the Hubble Space Telescope using two different filters. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
F439W (B) blue
F673N ([SII]) red
Orientation: Vesta - May 14, 2007