Comet C/2021 A2

Comet C/2021 A2 is currently in the constellation of Cygnus. The current Right Ascension of Comet C/2021 A2 is 21h 21m 01s and the Declination is +47° 55’ 50” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 A2 is 23.82 (JPL).

Today's rise, transit and set times of Comet C/2021 A2 from Greenwich, United Kingdom [change] (all times relative to the local timezone Europe/London):

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Available Resources

• Position and finder charts (see also Where is Comet C/2021 A2?)
• Distance from Earth (see also How far is Comet C/2021 A2 from Earth?)
• When does Comet C/2021 A2 rise and set?
• Brightness (see also How bright is Comet C/2021 A2?)
• Orbital elements. Detailed information about Comet C/2021 A2 orbital parameters.
• Interactive orbit visualization. 3d visualization showing the orbit of Comet C/2021 A2 with respect to the major Solar System objects.
• 15 days ephemerides. Table showing celestial coordinates and magnitude of Comet C/2021 A2 for the past and next 7 days.
• Interactive sky chart. An online planetarium application that shows where to locate Comet C/2021 A2 in the sky from your location.
• Live position tracker. A high precision sky chart that uses real deep sky imagery to help locate Comet C/2021 A2 with your telescope or on your astrophotographies.

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 1,299,699,918 kilometers, equivalent to 8.687957 Astronomical Units. Light takes 1 hours, 12 minutes and 15.3323 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 1 January 2013 and 30 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 current visual magnitude of Comet C/2021 A2 is 23.82.

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.

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.

Date	Right AscensionR.A.	DeclinationDec.	MagnitudeMag	Constellation
2023 Mar 24	21h 18m 02s	+47° 24’ 14”	23.79	Cygnus
2023 Mar 25	21h 18m 25s	+47° 28’ 03”	23.80	Cygnus
2023 Mar 26	21h 18m 50s	+47° 31’ 54”	23.80	Cygnus
2023 Mar 27	21h 19m 14s	+47° 35’ 49”	23.80	Cygnus
2023 Mar 28	21h 19m 36s	+47° 39’ 48”	23.81	Cygnus
2023 Mar 29	21h 19m 59s	+47° 43’ 49”	23.81	Cygnus
2023 Mar 30	21h 20m 21s	+47° 47’ 53”	23.81	Cygnus
2023 Mar 31	21h 20m 41s	+47° 51’ 59”	23.82	Cygnus
2023 Apr 01	21h 21m 02s	+47° 56’ 08”	23.82	Cygnus
2023 Apr 02	21h 21m 23s	+48° 00’ 20”	23.82	Cygnus
2023 Apr 03	21h 21m 42s	+48° 04’ 33”	23.82	Cygnus
2023 Apr 04	21h 22m 02s	+48° 08’ 49”	23.83	Cygnus
2023 Apr 05	21h 22m 22s	+48° 13’ 08”	23.83	Cygnus
2023 Apr 06	21h 22m 40s	+48° 17’ 29”	23.83	Cygnus