File:34Circe_(Lightcurve_Inversion).png · Wikimedia Commons · See Wikimedia Commons
Picture of the Day · NASA
Pathfinder on Mars
2026-07-04
On July 4th, 1997, using its own array of fireworks, a parachute, and a cocoon of airbags, the Mars Pathfinder spacecraft bounced like a giant beach ball at least 15 times before it came to rest on the surface of Mars at 10:07 AM Pacific Daylight Time. After its then novel airbag-assisted landing sequence was completed, Pathfinder transmitted this color mosaic to mission operators on Earth. In the scene from another world, the Mars Sojourner robot rover is visible in the foreground, crouched on top of the unfolded Pathfinder. About the size of a large house cat, the six-wheeled, solar-powered Sojourner became the first successful Martian rover. Surrounding Pathfinder are deflated airbags and the rock-strewn terrain of the Ares Vallis floodplain. In the distance Martian hills appear against a dusty brownish sky. The Pathfinder lander was subsequently renamed the Carl Sagan Memorial Station.
via NASA APOD
Key facts
- Discovered by
- J. Chacornac
- Discovery date
- 6 April 1855
- Designation
- (34) Circe
- Pronunciation
- / ˈ s ɜːr s iː /
- Named after
- Circe
- Alternative names
- 1965 JL
- Minor planet category
- Main belt
- Adjectives
- Circean / s ər ˈ s iː ə n /
- Aphelion
- 2.975 AU
- Perihelion
- 2.401 AU
- Semi major axis
- 2.688 AU
- Orbital period sidereal
- 4.407 yr (1609.636 d)
- Average orbital speed
- 18.12 km/s
- Mean anomaly
- 305.209°
- Inclination
- 5.496°
- Longitude of ascending node
- 184.294°
- Argument of perihelion
- 329.414°
- Jupiter moid
- 2.023 AU
via Wikipedia infobox
Wikidata facts
- Diameter
- 132.992
- Orbital period
- 1609.635566708381
- Image
- 34Circe (Lightcurve Inversion).png
Show 15 more facts
- provisional designation
- A855 GA
- time of discovery or invention
- 1855-04-06
- orbital inclination
- 5.495879500166094
- albedo
- 0.023
- Commons category
- 34 Circe
- rotation period
- 12.15
- absolute magnitude
- 8.77
- orbital eccentricity
- 0.1067839997222784
- semi-major axis of an orbit
- 2.687939082080174
- periapsis
- 2.400910195885823
- apoapsis
- 2.974967968274524
- longitude of ascending node
- 184.2941995909926
- argument of periapsis
- 329.4138134483688
- mean anomaly
- 305.209033379677
- time of periapsis
- 2461245.4819127955
Sources (2)
via Wikidata · CC0
~1 min read
Article
34 Circe is a large, very dark main-belt asteroid. It was discovered by French astronomer J. Chacornac on 6 April 1855, and named after Circe, the bewitching queen of Aeaea island in Greek mythology.
The spectrum of this object matches a C-type asteroid, suggesting a carbonaceous composition. It has a cross-section size of 113 km and is orbiting the Sun with a period of 4.40 years. Photometric observations of this asteroid made during 2007 at the Organ Mesa Observatory in Las Cruces, New Mexico gave an asymmetrical bimodal light curve with a period of 12.176 ± 0.002 hours and a brightness variation of 0.17 ± 0.02 in magnitude. The spectra of the asteroid displays evidence of aqueous alteration.