2020 XR
# 2020 XR

2020 XR is an Apollo near-Earth object and potentially hazardous asteroid roughly 390 meters (1,000 feet) in diameter. With a 5-day observation arc it was briefly listed as having a 1 in 11,000 chance of impacting Earth on 1 December 2028 placing it at the top of the Sentry Risk Table with a Palermo scale rating of -0.70.

## Discovery

2020 XR was discovered by Pan-STARRS 2 on 4 December 2020, when it was 0.426 AU (63.7 million km) from Earth and had a solar elongation of 75°. It came to perihelion on 8 December 2020. On 2 January 2021, it passed 0.328 AU (49.1 million km) from Earth.

On 13 December 2020, precovery observations from 2013, 2016, and mid-2020 extended the observation arc from 8 days to 7.8 years allowing the asteroid to be removed from the Sentry Risk Table.

## 2024

It was the Earth perturbations of the asteroid in 2024 that determined if an impact was possible in December 2028. On 4 December 2024, the asteroid will pass 0.0147 AU (2.20 million km; 5.7 LD) from Earth with an uncertainty region of about ±800 km. This will increase the asteroid's orbital period by 10 days.

Orbital period 3 months before and after 2024-Dec-04 Earth approach :

| Parameter | Epoch (date) | Orbital Period |
| - | - | - |
| Units | | (days) |
| Pre-flyby | 2024-Sep-04 | 1441 |
| Post-flyby | 2025-Mar-04 | 1451 |

## 2028

On 7 November 2028, the asteroid will pass 0.121 AU (18.1 million km) from Earth. By 1 December 2028 the asteroid will be 0.19 AU (28 million km) from Earth with an uncertainty region of about ±10,000 km.

