Communication
Faster access than browser!

# 5 Astraea

5 Astraea is a large asteroid from the asteroid belt. [1]

## Apparent magnitude

The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

## Arecibo Observatory

The Arecibo Observatory is a radio telescope in the municipality of Arecibo, Puerto Rico.

## Asteroid

Asteroids are minor planets, especially those of the inner Solar System.

## Asteroid belt

The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter.

## Asteroid spectral types

Asteroids are assigned a type based on spectral shape, color, and sometimes albedo.

## Astraea (mythology)

Astraea or Astrea (Ἀστραῖα; "star-maiden"), in ancient Greek religion, was a daughter of Astraeus and Eos.

## Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun.

## Axial tilt

In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.

## Ceres (dwarf planet)

Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt, which lies between the orbits of Mars and Jupiter.

## Declination

In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.

## Geometric albedo

In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e at zero phase angle) to that of an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section.

## Geometric mean

In mathematics, the geometric mean is a type of mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).

## Iron

Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.

New!!: 5 Astraea and Iron · See more »

## Julian day

Julian day is the continuous count of days since the beginning of the Julian Period used primarily by astronomers.

## Julian year (astronomy)

In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.

## Karl Ludwig Hencke

Karl Ludwig Hencke (8 April 1793 - 21 September 1866) was a German amateur astronomer.

## Kelvin

The kelvin is a unit of measure for temperature based upon an absolute scale.

## Magnesium

Magnesium is a chemical element with symbol Mg and atomic number 12.

## Mark (currency)

The mark was a currency or unit of account in many nations.

## NASA

The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

New!!: 5 Astraea and NASA · See more »

## Nickel

Nickel is a chemical element with symbol Ni and atomic number 28.

## Prussia

Prussia (Prusy) was a historic state originating out of the Duchy of Prussia and the Margraviate of Brandenburg, and centered on the region of Prussia.

Radar astronomy is a technique of observing nearby astronomical objects by reflecting microwaves off target objects and analyzing the reflections.

Retrograde motion is motion in the direction opposite to the movement of something else and the contrary of direct or prograde motion.

## Right ascension

Right ascension (abbreviated RA; symbol α) is the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle of the point in question.

## S-type asteroid

S-type asteroids, or silicaceous asteroids, are of a stony composition, hence the name.

## Silicate minerals

The silicate minerals are rock-forming minerals, constituting approximately 90 percent of the crust of the Earth.

## 192 Nausikaa

192 Nausikaa is a large main-belt S-type asteroid.

## 324 Bamberga

324 Bamberga is one of the largest asteroids in the asteroid belt.

## 4 Vesta

Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of.

## 6 Hebe

6 Hebe is a large main-belt asteroid, containing around half a percent of the mass of the belt.

## References

Hey! We are on Facebook now! »