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5 Astraea

File:5_Astraea.png · Wikimedia Commons · See Wikimedia Commons

EntityQ105328· pop 69· linked from 44 articles

Also known as (5) Astraea, Astraea

main-belt asteroid

AI overview

5 Astraea is an asteroid located in the main belt between Mars and Jupiter. It is historically significant as the first asteroid to be discovered after a 38-year gap in asteroid discoveries, found in 1845 after astronomers had identified only four asteroids since 1801.

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

Picture of the Day · NASA

Pathfinder on Mars

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
Astraea
Followed by
6 Hebe
Follows
Vesta
Parent body
Sun
Minor-planet group
asteroid belt
Diameter
106.699
Mass
2400000000000000000
Orbital period
1510.900403833822
Image
5-Astraea-Size.svg
Show 24 more facts
discoverer or inventor
Karl Ludwig Hencke
provisional designation
A845 XA
site of astronomical discovery
Drezdenko
time of discovery or invention
1845-12-08
asteroid spectral type
S-type asteroid
Commons category
5 Astraea
orbital inclination
5.359248120907578
apparent magnitude
12.33
density
2.7
albedo
0.274
title
(5) Astraea
page(s)
15-15
Unicode character
rotation period
16.806
absolute magnitude
6.99
orbital eccentricity
0.1875086167326962
semi-major axis of an orbit
2.576864644873385
periapsis
2.093680319805786
apoapsis
3.060048969940984
longitude of ascending node
141.4486125155515
argument of periapsis
359.3451688058446
mean anomaly
133.867603161995
time of periapsis
2460438.664956451
Sources (2)

via Wikidata · CC0

~3 min read

Encyclopedic overview

5 Astraea (/æˈstriːə/) is an asteroid in the asteroid belt. This object is orbiting the Sun at a distance of 385 million kilometres (2.5735 AU) with a period of 4.13 yr and an orbital eccentricity of 0.19. The orbital plane is inclined at an angle of 5.37° to the plane of the ecliptic. It is spinning with a period of 16.8 h. The surface of Astraea is highly reflective and its composition is probably a mixture of nickel–iron with silicates of magnesium and iron. It is an S-type asteroid in the Tholen classification system.

Discovery and name

Excerpted from Wikipedia’s “5 Astraea” article, available under the CC BY-SA 4.0 licence.

Gallery (3)