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🌎 Location: Greenwich, United Kingdom [change]

Asteroid (NEO) 2021 AC1

Asteroid (NEO) 2021 AC1 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 AC1 Impact Earth?.

Asteroid (NEO) 2021 AC1 is currently in the constellation of Draco. The current Right Ascension of Asteroid (NEO) 2021 AC1 is 18h 10m 50s and the Declination is +50° 12’ 58” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid (NEO) 2021 AC1 is 21.73 (JPL).

Summary of key facts about Asteroid (NEO) 2021 AC1 [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]:

18h 10m 50s
+50° 12’ 58”
  • 2021 AC1 is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the North-North-West direction at an altitude of 17° above the horizon.
  • Given its current magnitude, 2021 AC1 is visible only through long exposure photography.
  • See also 2021 AC1 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 AC1 available on TheSkyLive:

Available Resources

Asteroid (NEO) 2021 AC1 Position and Finder Charts

Below we provide Asteroid (NEO) 2021 AC1 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 AC1 in Draco on January, 24 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid (NEO) 2021 AC1 in Draco on January, 24 2021
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 AC1?, a page that provides all the information needed to find Asteroid (NEO) 2021 AC1 in the sky and additional links to sky charts.

Asteroid (NEO) 2021 AC1 Distance from Earth

The distance of Asteroid (NEO) 2021 AC1 from Earth is currently 5,433,858 kilometers, equivalent to 0.036323 Astronomical Units. Light takes 18.1254 seconds to travel from Asteroid (NEO) 2021 AC1 and arrive to us.

18.1254 seconds

The following chart shows the distance of Asteroid (NEO) 2021 AC1 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 AC1 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 AC1 to Earth

During the next 10 years, the closest approach of Asteroid (NEO) 2021 AC1 to Earth happens on Sat Jan 16 2021 at a distance of 0.020838 Astronomical Units, or 3,117,367 kilometers:

Sat Jan 16 2021

Asteroid (NEO) 2021 AC1 brightness

The current visual magnitude of Asteroid (NEO) 2021 AC1 is 21.73.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid (NEO) 2021 AC1, 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 AC1 between January 2013 and December 2100

Asteroid (NEO) 2021 AC1 rise and set times

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

Asteroid (NEO) 2021 AC1 is circumpolar and transits at 09:54 UTC (altitude: 88.8°)

The rise and set times are defined as the time at which the upper limb of Asteroid (NEO) 2021 AC1 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 AC1 Orbital Elements

The following table lists the orbital elements of Asteroid (NEO) 2021 AC1 at epoch 04 January 2021 00:00 UTC (JD: 2459219.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31148713
Orbit inclination i 7.10755054°
Perihelion distance q 0.97074350 AU
145,221,161 km
Aphelion distance Q 1.84908325 AU
276,618,917 km
Semi-major axis a 1.40991337 AU
210,920,039 km
Orbital period period 1.6700 years
611.4868 days
Date of perihelion transit Tp 2021-Feb-04 07:33:11
2,459,249.8147 JD
Argument of perihelion peri 29.158552109685°
Longitude of the ascending node node 108.34369682206°
Mean anomaly M 342.15284651354°
Mean motion n 0.58872900°/day

Visualization of Asteroid (NEO) 2021 AC1 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid (NEO) 2021 AC1 with respect of the Sun and the orbits of the major planets. The position of Asteroid (NEO) 2021 AC1 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 AC1
View Asteroid (NEO) 2021 AC1 in the 3D Solar System Simulator

Asteroid (NEO) 2021 AC1 15 Days Ephemeris

The following table lists the ephemerides of Asteroid (NEO) 2021 AC1 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 AC1 in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 Jan 17 00h 22m 00s +61° 33’ 09” 19.66 Cassiopeia
2021 Jan 18 23h 05m 30s +65° 14’ 56” 19.91 Cepheus
2021 Jan 19 21h 43m 05s +66° 02’ 02” 20.20 Cepheus
2021 Jan 20 20h 32m 50s +64° 26’ 14” 20.50 Cepheus
2021 Jan 21 19h 41m 30s +61° 36’ 00” 20.79 Draco
2021 Jan 22 19h 05m 39s +58° 23’ 34” 21.07 Draco
2021 Jan 23 18h 40m 23s +55° 15’ 29” 21.33 Draco
2021 Jan 24 18h 22m 00s +52° 22’ 17” 21.56 Draco
2021 Jan 25 18h 08m 14s +49° 46’ 45” 21.77 Hercules
2021 Jan 26 17h 57m 38s +47° 28’ 30” 21.96 Hercules
2021 Jan 27 17h 49m 14s +45° 25’ 54” 22.13 Hercules
2021 Jan 28 17h 42m 30s +43° 37’ 05” 22.28 Hercules
2021 Jan 29 17h 37m 00s +42° 00’ 08” 22.41 Hercules
2021 Jan 30 17h 32m 25s +40° 33’ 26” 22.54 Hercules