Comet C/2021 A2
Comet C/2021 A2 is currently in the constellation of Cepheus. The current Right Ascension of Comet C/2021 A2 is 22h 16m 58s and the Declination is +63° 34’ 53” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 A2 is 22.26 (JPL).
Summary of key facts about Comet C/2021 A2 [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]:
- C/2021 A2 is above the horizon from Greenwich, United Kingdom [change].
- It is visible looking in the North direction at an altitude of 25° above the horizon.
- Given its current magnitude, C/2021 A2 is visible only through long exposure photography.
- See also C/2021 A2 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 Comet C/2021 A2 available on TheSkyLive:
Comet C/2021 A2 Position and Finder Charts
Below we provide Comet C/2021 A2 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.
Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2021 A2 is right now. Click on the image to see a more detailed fullscreen tracker view.
Also check out Where is Comet C/2021 A2?, a page that provides all the information needed to find Comet C/2021 A2 in the sky and additional links to sky charts.
Comet C/2021 A2 Distance from Earth
The distance of Comet C/2021 A2 from Earth is currently 890,442,106 kilometers, equivalent to 5.952238 Astronomical Units. Light takes 49 minutes and 30.1952 seconds to travel from Comet C/2021 A2 and arrive to us.
The following chart shows the distance of Comet C/2021 A2 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.
The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2021 A2 from Earth is also available as a real time updated value in the Live Position and Data Tracker.
Closest approach of Comet C/2021 A2 to Earth
Between January 2013 and December 2100, the closest approach of Comet C/2021 A2 to Earth happens on Wed Feb 3 2021 at a distance of 0.506733 Astronomical Units, or 75,806,248 kilometers:
NOTE: values for the closest approach are computed with a sampling interval of 1 day.
Comet C/2021 A2 brightness
The observed magnitude and coma diameter values are derived from the Comet Observers Database by averaging the values reported in recent observations (more recent than 4 days), when available. The Estimated Magnitude comes from the JPL Horizons ephemerides service and might be inaccurate given the highly dynamic and unpredictable behavior of comets. When available, please refer to the Observed Magnitude value and consider the Estimated Magnitude as a directional indication. We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations.
The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2021 A2, 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.
Comet C/2021 A2 rise and set times
Comet C/2021 A2 is circumpolar and transits at 06:29 UTC (altitude: 77.9°)
The rise and set times are defined as the time at which the upper limb of Comet C/2021 A2 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.
Comet C/2021 A2 Orbital Elements
|Perihelion distance||q||1.41297511 AU
|Date of perihelion transit||Tp||2021-Jan-22 15:13:12
|Next perihelion transit||6170-Oct-08 22:31
|Argument of perihelion||peri||338.84903384462°|
|Longitude of the ascending node||node||125.23825155612°|
Visualization of Comet C/2021 A2 Orbit
This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 A2 with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 A2 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!
Comet C/2021 A2 15 Days Ephemeris
The following table lists the ephemerides of Comet C/2021 A2 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2021 A2 in our Online Planetarium at the chosen date.
|2022 May 12||22h 17m 48s||+62° 41’ 54”||22.23||Cepheus|
|2022 May 13||22h 17m 45s||+62° 48’ 43”||22.23||Cepheus|
|2022 May 14||22h 17m 43s||+62° 55’ 33”||22.24||Cepheus|
|2022 May 15||22h 17m 39s||+63° 02’ 22”||22.24||Cepheus|
|2022 May 16||22h 17m 33s||+63° 09’ 12”||22.25||Cepheus|
|2022 May 17||22h 17m 26s||+63° 16’ 01”||22.25||Cepheus|
|2022 May 18||22h 17m 17s||+63° 22’ 50”||22.26||Cepheus|
|2022 May 19||22h 17m 08s||+63° 29’ 38”||22.26||Cepheus|
|2022 May 20||22h 16m 55s||+63° 36’ 24”||22.26||Cepheus|
|2022 May 21||22h 16m 44s||+63° 43’ 10”||22.27||Cepheus|
|2022 May 22||22h 16m 28s||+63° 49’ 54”||22.27||Cepheus|
|2022 May 23||22h 16m 13s||+63° 56’ 39”||22.28||Cepheus|
|2022 May 24||22h 15m 56s||+64° 03’ 20”||22.28||Cepheus|
|2022 May 25||22h 15m 37s||+64° 10’ 01”||22.29||Cepheus|