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Comet C/2021 A7 (NEOWISE)

Comet C/2021 A7 (NEOWISE) is currently in the constellation of Canis Majoris. The current Right Ascension of Comet C/2021 A7 (NEOWISE) is 06h 45m 57s and the Declination is -23° 37’ 36” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 A7 (NEOWISE) is 16.85 (JPL) while the latest observed magnitude is 15.5 (COBS).

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]:

06h 45m 57s
-23° 37’ 36”
Canis Majoris

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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 Canis Majoris on April, 16 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2021 A7 (NEOWISE) in Canis Majoris on April, 16 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]

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: 06h 45m 57s
Dec: -23° 37’ 36”
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 321,897,491 kilometers, equivalent to 2.151752 Astronomical Units. Light takes 17 minutes and 53.7345 seconds to travel from Comet C/2021 A7 (NEOWISE) and arrive to us.

17 minutes and 53.7345 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 2.136649 Astronomical Units, or 319,638,142 kilometers:

Mon Apr 5 2021

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 16.85.


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

Today's Comet C/2021 A7 (NEOWISE) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 113.8°
Max altitude: 14.8°
Azimuth: 246.4°

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 01 February 2021 00:00 UTC (JD: 2459247.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99962532
Orbit inclination i 78.14874369°
Perihelion distance q 1.96768294 AU
294,361,178 km
Aphelion distance Q 10,501.23351588 AU
1,570,962,176,849 km
Semi-major axis a 5,251.60059941 AU
785,628,269,014 km
Orbital period period 380,579.8000 years
139,006,772.7652 days
Date of perihelion transit Tp 2021-Jul-15 08:05:28
2,459,410.8371 JD
Argument of perihelion peri 356.06764221586°
Longitude of the ascending node node 154.51931899832°
Mean anomaly M 359.99957698918°
Mean motion n 0.00000259°/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
2021 Apr 09 06h 34m 32s -28° 23’ 18” 16.87 Canis Majoris
2021 Apr 10 06h 35m 57s -27° 46’ 48” 16.87 Canis Majoris
2021 Apr 11 06h 37m 20s -27° 10’ 22” 16.86 Canis Majoris
2021 Apr 12 06h 38m 47s -26° 34’ 00” 16.86 Canis Majoris
2021 Apr 13 06h 40m 13s -25° 57’ 43” 16.86 Canis Majoris
2021 Apr 14 06h 41m 39s -25° 21’ 33” 16.85 Canis Majoris
2021 Apr 15 06h 43m 08s -24° 45’ 30” 16.85 Canis Majoris
2021 Apr 16 06h 44m 36s -24° 09’ 34” 16.85 Canis Majoris
2021 Apr 17 06h 46m 06s -23° 33’ 47” 16.85 Canis Majoris
2021 Apr 18 06h 47m 36s -22° 58’ 08” 16.84 Canis Majoris
2021 Apr 19 06h 49m 08s -22° 22’ 37” 16.84 Canis Majoris
2021 Apr 20 06h 50m 39s -21° 47’ 17” 16.84 Canis Majoris
2021 Apr 21 06h 52m 12s -21° 12’ 09” 16.84 Canis Majoris
2021 Apr 22 06h 53m 44s -20° 37’ 09” 16.84 Canis Majoris