137170 (1999 HF1) is a mid-sized asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 1999 HF1 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.
1999 HF1 orbits the sun every 271 days (0.74 years), coming as close as 0.44 AU and reaching as far as 1.20 AU from the sun. Based on its brightness and the way it reflects light, 1999 HF1 is probably between 3.196 to 7.146 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the island of Manhattan.
The rotation of 1999 HF1 has been observed. It completes a rotation on its axis every 2.32 days.
1999 HF1's orbit is 0.17 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.
1999 HF1 has 8 close approaches predicted in the coming decades:
|Date||Distance from Earth (km)||Velocity (km/s)|
|March 16, 2022||27,223,589||19.709|
|March 8, 2045||27,937,264||17.084|
|March 13, 2065||26,202,025||18.882|
|March 12, 2108||26,312,254||18.074|
|March 17, 2128||28,142,935||20.048|
|March 12, 2151||26,892,187||17.661|
|March 17, 2171||27,013,617||19.445|
|March 9, 2194||29,278,111||16.769|
1999 HF1's orbit is determined by observations dating back to April 20, 1999. It was last officially observed on June 12, 2020. The IAU Minor Planet Center records 3,775 observations used to determine its orbit.
The position of 137170 (1999 HF1) 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.