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🌎  Greenwich, United Kingdom [change]

Asteroid (NEO) 2021 PJ1

Asteroid (NEO) 2021 PJ1 is a Near Earth Object. If you've heard news about a potential impact of this asteroid with the Earth, please check out Will Asteroid Asteroid (NEO) 2021 PJ1 Impact Earth?.

Asteroid (NEO) 2021 PJ1 is currently in the constellation of Libra. The current Right Ascension of Asteroid (NEO) 2021 PJ1 is 15h 19m 29s and the Declination is -18° 10’ 50” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid (NEO) 2021 PJ1 is 29.31 (JPL).

Summary of key facts about Asteroid (NEO) 2021 PJ1 [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

15h 19m 29s
-18° 10’ 50”
  • 2021 PJ1 is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-South-West direction at an altitude of 15° above the horizon.
  • Given its current magnitude, 2021 PJ1 is visible only through long exposure photography.
  • See also 2021 PJ1 rise and set times.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Additional information about Asteroid (NEO) 2021 PJ1 available on TheSkyLive:

Available Resources

Asteroid (NEO) 2021 PJ1 Position and Finder Charts

Below we provide Asteroid (NEO) 2021 PJ1 finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Asteroid (NEO) 2021 PJ1 in Libra on September, 24 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid (NEO) 2021 PJ1 in Libra on September, 24 2022
Field of view: 10x6 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Also check out Where is Asteroid (NEO) 2021 PJ1?, a page that provides all the information needed to find Asteroid (NEO) 2021 PJ1 in the sky and additional links to sky charts.

Asteroid (NEO) 2021 PJ1 Distance from Earth

The distance of Asteroid (NEO) 2021 PJ1 from Earth is currently 273,426,569 kilometers, equivalent to 1.827744 Astronomical Units. Light takes 15 minutes and 12.0529 seconds to travel from Asteroid (NEO) 2021 PJ1 and arrive to us.

15 minutes and 12.0529 seconds

The following chart shows the distance of Asteroid (NEO) 2021 PJ1 from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Distance of Asteroid (NEO) 2021 PJ1 from Earth between January 2013 and December 2100

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth.

Closest approach of Asteroid (NEO) 2021 PJ1 to Earth

During the next 10 years, the closest approach of Asteroid (NEO) 2021 PJ1 to Earth happens on Fri Aug 15 2025 at a distance of 0.011195 Astronomical Units, or 1,674,743 kilometers:

Fri Aug 15 2025

Asteroid (NEO) 2021 PJ1 brightness

The current visual magnitude of Asteroid (NEO) 2021 PJ1 is 29.31.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid (NEO) 2021 PJ1, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Asteroid (NEO) 2021 PJ1 between January 2013 and December 2100

Asteroid (NEO) 2021 PJ1 rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Asteroid (NEO) 2021 PJ1 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 108.1°
Max altitude: 20.4°
Azimuth: 251.8°

The rise and set times are defined as the time at which the upper limb of Asteroid (NEO) 2021 PJ1 touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Asteroid (NEO) 2021 PJ1 Orbital Elements

The following table lists the orbital elements of Asteroid (NEO) 2021 PJ1 at epoch 20 January 2022 00:00 UTC (JD: 2459600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.34305537
Orbit inclination i 0.36956211°
Perihelion distance q 0.79597467 AU
119,076,116 km
Aphelion distance Q 1.62728792 AU
243,438,808 km
Semi-major axis a 1.21163129 AU
181,257,462 km
Orbital period period 1.3337 years
487.1404 days
Date of perihelion transit Tp 2021-Oct-13 18:05:24
2,459,501.2538 JD
Next perihelion transit 2023-Feb-12 21:27
2,459,988.3942 JD
Argument of perihelion peri 169.50136933201°
Longitude of the ascending node node 232.77592642925°
Mean anomaly M 73.343638277251°
Mean motion n 0.73900666°/day

Visualization of Asteroid (NEO) 2021 PJ1 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid (NEO) 2021 PJ1 with respect of the Sun and the orbits of the major planets. The position of Asteroid (NEO) 2021 PJ1 and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Asteroid (NEO) 2021 PJ1
View Asteroid (NEO) 2021 PJ1 in the 3D Solar System Simulator

Asteroid (NEO) 2021 PJ1 15 Days Ephemeris

The following table lists the ephemerides of Asteroid (NEO) 2021 PJ1 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid (NEO) 2021 PJ1 in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 Sep 17 15h 00m 52s -16° 57’ 21” 29.34 Libra
2022 Sep 18 15h 03m 15s -17° 07’ 05” 29.34 Libra
2022 Sep 19 15h 05m 36s -17° 16’ 45” 29.34 Libra
2022 Sep 20 15h 08m 00s -17° 26’ 22” 29.33 Libra
2022 Sep 21 15h 10m 24s -17° 35’ 56” 29.33 Libra
2022 Sep 22 15h 12m 50s -17° 45’ 24” 29.32 Libra
2022 Sep 23 15h 15m 16s -17° 54’ 48” 29.32 Libra
2022 Sep 24 15h 17m 44s -18° 04’ 09” 29.31 Libra
2022 Sep 25 15h 20m 12s -18° 13’ 24” 29.31 Libra
2022 Sep 26 15h 22m 41s -18° 22’ 36” 29.30 Libra
2022 Sep 27 15h 25m 09s -18° 31’ 41” 29.30 Libra
2022 Sep 28 15h 27m 41s -18° 40’ 42” 29.29 Libra
2022 Sep 29 15h 30m 12s -18° 49’ 39” 29.28 Libra
2022 Sep 30 15h 32m 44s -18° 58’ 30” 29.28 Libra