Your guide to the Solar System and the night sky
Please donate now to help keep TheSkyLive ads-free. This site cannot run without your voluntary donations.
🌎  Greenwich, United Kingdom [change]

Comet C/2021 A7 (NEOWISE)

Comet C/2021 A7 (NEOWISE) is currently in the constellation of Hercules. The current Right Ascension of Comet C/2021 A7 (NEOWISE) is 16h 46m 01s and the Declination is +48° 33’ 07” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 A7 (NEOWISE) is 18.03 (JPL).

Summary of key facts about Comet C/2021 A7 (NEOWISE) [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]:

16h 46m 01s
+48° 33’ 07”
Hercules
18.03
  • C/2021 A7 (NEOWISE) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the North-East direction at an altitude of 32° above the horizon.
  • Given its current magnitude, C/2021 A7 (NEOWISE) is visible only through long exposure photography.
  • See also C/2021 A7 (NEOWISE) 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 A7 (NEOWISE) available on TheSkyLive:

Available Resources

Comet C/2021 A7 (NEOWISE) Position and Finder Charts

Below we provide Comet C/2021 A7 (NEOWISE) 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 Comet C/2021 A7 (NEOWISE) in Hercules on January, 29 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2021 A7 (NEOWISE) in Hercules on January, 29 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]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2021 A7 (NEOWISE) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 A7 (NEOWISE)
RA: 16h 46m 01s
Dec: +48° 33’ 07”
Deep sky finder chart for Comet C/2021 A7 (NEOWISE)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2021 A7 (NEOWISE)?, a page that provides all the information needed to find Comet C/2021 A7 (NEOWISE) in the sky and additional links to sky charts.

Comet C/2021 A7 (NEOWISE) Distance from Earth

The distance of Comet C/2021 A7 (NEOWISE) from Earth is currently 442,642,238 kilometers, equivalent to 2.958881 Astronomical Units. Light takes 24 minutes and 36.4956 seconds to travel from Comet C/2021 A7 (NEOWISE) and arrive to us.

442,642,238
2.958881
24 minutes and 36.4956 seconds

The following chart shows the distance of Comet C/2021 A7 (NEOWISE) 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 Comet C/2021 A7 (NEOWISE) 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. The value of the distance of C/2021 A7 (NEOWISE) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2021 A7 (NEOWISE) to Earth

Between January 2013 and December 2100, the closest approach of Comet C/2021 A7 (NEOWISE) to Earth happens on Mon Apr 5 2021 at a distance of 2.136625 Astronomical Units, or 319,634,539 kilometers:

Mon Apr 5 2021
319,634,539
2.136625

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Comet C/2021 A7 (NEOWISE) brightness

The current visual magnitude of Comet C/2021 A7 (NEOWISE) is 18.03.

18.03
-
-

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 A7 (NEOWISE), 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 Comet C/2021 A7 (NEOWISE) between January 2013 and December 2100

Comet C/2021 A7 (NEOWISE) rise and set times

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

Comet C/2021 A7 (NEOWISE) is circumpolar and transits at 08:11 UTC (altitude: 87.1°)

The rise and set times are defined as the time at which the upper limb of Comet C/2021 A7 (NEOWISE) 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 A7 (NEOWISE) Orbital Elements

The following table lists the orbital elements of Comet C/2021 A7 (NEOWISE) at epoch 11 March 2021 00:00 UTC (JD: 2459285.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99971204
Orbit inclination i 78.14887638°
Perihelion distance q 1.96767672 AU
294,360,249 km
Aphelion distance Q 13,664.51388115 AU
2,044,182,184,870 km
Semi-major axis a 6,833.24077894 AU
1,022,238,272,559 km
Orbital period period 564,869.7113 years
206,318,662.0675 days
Date of perihelion transit Tp 2021-Jul-15 07:55:40
2,459,410.8303 JD
Next perihelion transit 2843-Apr-20 21:06
208,778,072.8978 JD
Argument of perihelion peri 356.06641388189°
Longitude of the ascending node node 154.51922062166°
Mean anomaly M 359.99978131442°
Mean motion n 0.00000174°/day

Visualization of Comet C/2021 A7 (NEOWISE) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 A7 (NEOWISE) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 A7 (NEOWISE) 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 Comet C/2021 A7 (NEOWISE)
View Comet C/2021 A7 (NEOWISE) in the 3D Solar System Simulator

Comet C/2021 A7 (NEOWISE) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2021 A7 (NEOWISE) 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 A7 (NEOWISE) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 Jan 22 16h 30m 34s +46° 43’ 32” 17.96 Hercules
2022 Jan 23 16h 32m 48s +46° 59’ 03” 17.97 Hercules
2022 Jan 24 16h 35m 00s +47° 14’ 34” 17.98 Hercules
2022 Jan 25 16h 37m 13s +47° 30’ 03” 17.99 Hercules
2022 Jan 26 16h 39m 24s +47° 45’ 34” 18.00 Hercules
2022 Jan 27 16h 41m 35s +48° 01’ 05” 18.01 Hercules
2022 Jan 28 16h 43m 45s +48° 16’ 36” 18.02 Hercules
2022 Jan 29 16h 45m 52s +48° 32’ 05” 18.03 Hercules
2022 Jan 30 16h 48m 01s +48° 47’ 35” 18.04 Hercules
2022 Jan 31 16h 50m 08s +49° 03’ 03” 18.05 Hercules
2022 Feb 01 16h 52m 14s +49° 18’ 32” 18.05 Hercules
2022 Feb 02 16h 54m 20s +49° 34’ 00” 18.06 Hercules
2022 Feb 03 16h 56m 25s +49° 49’ 26” 18.07 Hercules
2022 Feb 04 16h 58m 27s +50° 04’ 51” 18.08 Hercules