Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the U.S. Pentagon (1.40 km diameter)
  • Will pass within 16,459,833 km of Earth in 2023
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

Castalia is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified Castalia as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

Castalia orbits the sun every 400 days (1.10 years), coming as close as 0.55 AU and reaching as far as 1.58 AU from the sun. Castalia is about 1.4 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. Pentagon.

The rotation of Castalia has been observed. It completes a rotation on its axis every 4.10 hours.

Close Approaches

Castalia's orbit is 0.02 AU from Earth's orbit at its closest point. This means that there is an wide berth between this asteroid and Earth at all times.

Castalia has 22 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Aug. 22, 2023 16,459,833 18.197
April 4, 2027 19,272,338 13.757
Aug. 26, 2046 3,751,790 14.726
April 11, 2050 23,306,448 17.785
Aug. 19, 2057 24,669,055 19.837
April 1, 2061 21,644,874 12.733
Aug. 27, 2080 9,242,566 13.486
April 13, 2084 29,553,942 19.532
Aug. 23, 2091 13,371,619 17.572
April 6, 2095 18,289,921 15.044
March 28, 2106 29,713,839 10.551
Aug. 30, 2114 26,421,315 10.568
Aug. 28, 2125 4,276,091 14.617
April 13, 2129 26,291,314 18.644
Aug. 24, 2136 13,493,805 17.608
April 8, 2140 18,567,122 15.525
Aug. 20, 2147 29,774,038 20.847
April 2, 2151 23,058,651 12.274
Aug. 31, 2170 24,673,600 10.814
Aug. 29, 2181 7,895,907 13.790
Aug. 26, 2192 7,107,524 16.268
April 10, 2196 20,385,548 16.665

Images and Observations

Castalia's orbit is determined by observations dating back to Aug. 1, 1989. It was last officially observed on July 7, 2021. The IAU Minor Planet Center records 336 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of Castalia:

References

Search

   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 1.063 AU
  • Eccentricity: 0.4831
  • Inclination: 8.89°
  • Longitude of Ascending Node: 325.54°
  • Argument of Periapsis: 121.41°
  • Mean Anomaly: 321.59°

Physical Characteristics

  • Diameter: 1.40000 km
  • Magnitude: 17.48
  • Albedo: 0.092

Derived Characteristics

  • Orbit Period: 400 days (1.10 years)
  • Avg. Orbit Speed: 28.91 km/s
  • Aphelion Distance: 1.58 AU
  • Perihelion Distance: 0.55 AU
  • Rotation Period: 4.10 hours

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of Castalia is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of Castalia to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.