951 Gaspra

Also known as (951) Gaspra, Gaspra

main-belt asteroid

AI overview

951 Gaspra is a rocky asteroid located in the main asteroid belt between Mars and Jupiter. It gained scientific importance as the first asteroid ever photographed up close, when NASA's Galileo spacecraft flew past it in 1991.

AI-generated from the Wikipedia summary — may contain errors.

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

Wikidata facts

Instance of: asteroid
Named after: Gaspra
Followed by: Q158240
Follows: 950 Ahrensa
Parent body: Sun
Minor-planet group: asteroid belt
Diameter: 12.2
Orbital period: 1200.205198698645
Image: Galileo Gaspra Mosaic.jpg

Show 24 more facts

discoverer or inventor: Grigory Neujmin
site of astronomical discovery: Simeiz Observatory
provisional designation: A916 OJ
time of discovery or invention: 1916-07-30
Commons gallery: 951 Gaspra
Commons category: 951 Gaspra
orbital inclination: 4.105754340130082
density: 2.7
rotation period: 7.042
asteroid spectral type: S-type asteroid
apparent magnitude: 16.8
albedo: 0.246
different from: Gaspra
color index: 0.870
absolute magnitude: 11.46
orbital eccentricity: 0.1734202896130122
semi-major axis of an orbit: 2.210232960621018
periapsis: 1.826933720477895
apoapsis: 2.59353220076414
longitude of ascending node: 252.987864842457
argument of periapsis: 130.0369715944868
mean anomaly: 52.93682024274722
time of periapsis: 2460824.013758728
epoch: November 21, 2025

Sources (6)

via Wikidata · CC0

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Encyclopedic overview

951 Gaspra is an S-type asteroid that orbits very close to the inner edge of the asteroid belt. Gaspra was discovered by Russian astronomer G. N. Neujmin in 1916. Neujmin named it after Gaspra, a Black Sea retreat that was visited by his contemporaries, such as Gorky and Tolstoy.

Gaspra was the first asteroid ever to be closely approached when it was visited by the Galileo spacecraft, which flew by on its way to Jupiter on 29 October 1991.

Excerpted from Wikipedia’s “951 Gaspra” article, available under the CC BY-SA 4.0 licence.