429094 (2009 SG2)

Very small Apollo-class Asteroid

Near-Earth Potentially Hazardous
Space Reference » Apollo-class Asteroids » 429094 (2009 SG2)

Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the U.S. Capitol building
  • Will pass within 21,190,721 km of Earth in 2028
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

429094 (2009 SG2) is a very small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 2009 SG2 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

2009 SG2 orbits the sun every 433 days (1.19 years), coming as close as 0.93 AU and reaching as far as 1.31 AU from the sun. Based on its brightness and the way it reflects light, 2009 SG2 is probably between 0.259 to 0.578 kilometers in diameter, making it larger than 90% of asteroids but tiny compared to large asteroids, very roughly comparable in size to the U.S. Capitol building.

Close Approaches

2009 SG2's orbit is 0.03 AU from Earth's orbit at its closest point. This means that there is a wide berth between this asteroid and Earth at all times.

2009 SG2 has 17 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Sept. 26, 2028 21,190,721 13.592
March 26, 2034 26,993,659 16.952
April 4, 2047 23,389,490 13.428
Sept. 28, 2047 26,404,079 13.236
April 2, 2066 13,746,801 13.700
Sept. 26, 2079 29,627,425 15.883
April 1, 2085 9,880,431 13.898
April 3, 2104 13,405,123 13.715
April 5, 2123 22,865,420 13.433
Sept. 29, 2123 26,703,749 13.226
Sept. 28, 2142 21,332,252 13.576
March 28, 2148 20,903,619 16.236
Sept. 27, 2161 19,710,167 14.006
March 31, 2167 13,194,291 15.395
Sept. 26, 2180 19,924,472 14.246
March 31, 2186 11,147,677 15.178
Sept. 27, 2199 19,539,125 14.100

Images and Observations

2009 SG2's orbit is determined by observations dating back to Sept. 18, 2009. It was last officially observed on Oct. 28, 2022. The IAU Minor Planet Center records 190 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 2009 SG2:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 1.121 AU
  • Eccentricity: 0.1702
  • Inclination: 25.98°
  • Longitude of Ascending Node: 9.08°
  • Argument of Periapsis: 252.96°
  • Mean Anomaly: 355.62°

Physical Characteristics

  • Diameter: ~0.334 km
  • Magnitude: 20.06

Derived Characteristics

  • Orbit Period: 433 days (1.19 years)
  • Avg. Orbit Speed: 28.16 km/s
  • Aphelion Distance: 1.31 AU
  • Perihelion Distance: 0.93 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of 429094 (2009 SG2) 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 below comparison is an artistic rendering that uses available data on the diameter of 2009 SG2 to create an approximate landscape rendering with New York City in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.