PIA03070: Stargazing at 'Husband Hill Observatory' on Mars


Stargazing at ‘Husband Hill Observatory’ on Mars

Caption:

NASA's Mars Exploration Rover Spirit continues to take advantage of extra solar energy by occasionally turning its cameras upward for night sky observations. Most recently, Spirit made a series of observations of bright star fields from the summit of "Husband Hill" in Gusev Crater on Mars. Scientists use the images to assess the cameras' sensitivity and to search for evidence of nighttime clouds or haze. The image on the left is a computer simulation of the stars in the constellation Orion. The next three images are actual views of Orion captured with Spirit's panoramic camera during exposures of 10, 30, and 60 seconds.

Because Spirit is in the southern hemisphere of Mars, Orion appears upside down compared to how it would appear to viewers in the Northern Hemisphere of Earth. "Star trails" in the longer exposures are a result of the planet's rotation. The faintest stars visible in the 60-second exposure are about as bright as the faintest stars visible with the naked eye from Earth (about magnitude 6 in astronomical terms). The Orion Nebula, famous as a nursery of newly forming stars, is also visible in these images. Bright streaks in some parts of the images aren't stars or meteors or unidentified flying objects, but are caused by solar and galactic cosmic rays striking the camera's detector.Spirit acquired these images with the panoramic camera on Martian day, or sol, 632 (Oct. 13, 2005) at around 45 minutes past midnight local time, using the camera's broadband filter (wavelengths of 739 nanometers plus or minus 338 nanometers).

Cataloging Keywords:

Name Value Additional Values
Target Mars
System
Target Type Planet
Mission Mars Exploration Rover (MER)
Instrument Host Spirit (MER-A)
Host Type Rover
Instrument Panoramic Camera (Pancam)
Detector
Extra Keywords Atmosphere, Crater, Grayscale, Haze, Rotation
Acquisition Date
Release Date 2005-10-26
Date in Caption 2005-10-13
Image Credit NASA/JPL-Caltech/Cornell/Texas A&M/Space Science Institute
Source photojournal.jpl.nasa.gov/catalog/PIA03070
Identifier PIA03070