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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 5:52  ☀️ Transit: 12:04  🌅 Sunset: 18:18

Comet C/2021 K1 (ATLAS)

Comet C/2021 K1 (ATLAS) is currently in the constellation of Taurus. The current Right Ascension of Comet C/2021 K1 (ATLAS) is 04h 32m 34s and the Declination is +07° 49’ 04” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2021 K1 (ATLAS) is 25.78 (JPL).

04h 32m 34s
+07° 49’ 04”

Today's rise, transit and set times of Comet C/2021 K1 (ATLAS) from Greenwich, United Kingdom [change] (all times relative to the local timezone Europe/London):

Azimuth: 82.2°
Max altitude: 46.3°
Azimuth: 277.8°
  • C/2021 K1 (ATLAS) is above the horizon from Greenwich, United Kingdom [change].
  • Right now it is placed in the South-East direction at an altitude of 34° above the horizon.
  • Given its current magnitude, C/2021 K1 (ATLAS) is visible only through long exposure photography.
  • 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.

Available Resources

Comet C/2021 K1 (ATLAS) Position and Finder Charts

Below we provide Comet C/2021 K1 (ATLAS) 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 K1 (ATLAS) in Taurus on March, 25 2023
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2021 K1 (ATLAS) in Taurus on March, 25 2023
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 K1 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 K1 (ATLAS)
RA: 04h 32m 34s
Dec: +07° 49’ 04”
Deep sky finder chart for Comet C/2021 K1 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2021 K1 (ATLAS)?, a page that provides all the information needed to find Comet C/2021 K1 (ATLAS) in the sky and additional links to sky charts.

Comet C/2021 K1 (ATLAS) Distance from Earth

The distance of Comet C/2021 K1 (ATLAS) from Earth is currently 986,011,565 kilometers, equivalent to 6.591080 Astronomical Units. Light takes 54 minutes and 48.9806 seconds to travel from Comet C/2021 K1 (ATLAS) and arrive to us.

54 minutes and 48.9806 seconds

The following chart shows the distance of Comet C/2021 K1 (ATLAS) 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.

Chart of the distance of Comet C/2021 K1 (ATLAS) from Earth in Astronomical Units (au)

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 K1 (ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Comet C/2021 K1 (ATLAS) to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet C/2021 K1 (ATLAS) to Earth happens on Sat Aug 15 2065 at a distance of 1.477420 Astronomical Units, or 221,018,939 kilometers:

Sat Aug 15 2065

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

Comet C/2021 K1 (ATLAS) Brightness

The current visual magnitude of Comet C/2021 K1 (ATLAS) is 25.78.


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 K1 (ATLAS), 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.

Chart of the magnitude of Comet C/2021 K1 (ATLAS) as a function of time

Comet C/2021 K1 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2021 K1 (ATLAS) at epoch 18 August 2021 00:00 UTC (JD: 2459445.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.80399384
Orbit inclination i 16.27606739°
Perihelion distance q 2.49783183 AU
373,670,323 km
Aphelion distance Q 22.98944647 AU
3,439,172,247 km
Semi-major axis a 12.74363915 AU
1,906,421,285 km
Orbital period period 45.4934 years
16,616.4645 days
Date of perihelion transit Tp 2021-May-04 13:50:34
2,459,339.0768 JD
Next perihelion transit 2066-Nov-01 00:59
2,475,955.5413 JD
Argument of perihelion peri 184.30382098948°
Longitude of the ascending node node 140.90565587147°
Mean anomaly M 2.3056864316312°
Mean motion n 0.02166526°/day

Visualization of Comet C/2021 K1 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 K1 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 K1 (ATLAS) 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 K1 (ATLAS)
View Comet C/2021 K1 (ATLAS) in the 3D Solar System Simulator

Comet C/2021 K1 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2021 K1 (ATLAS) 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 K1 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2023 Mar 18 04h 29m 13s +07° 24’ 00” 25.67 Taurus
2023 Mar 19 04h 29m 39s +07° 27’ 21” 25.68 Taurus
2023 Mar 20 04h 30m 05s +07° 30’ 42” 25.70 Taurus
2023 Mar 21 04h 30m 30s +07° 34’ 02” 25.71 Taurus
2023 Mar 22 04h 30m 56s +07° 37’ 23” 25.73 Taurus
2023 Mar 23 04h 31m 23s +07° 40’ 41” 25.74 Taurus
2023 Mar 24 04h 31m 50s +07° 43’ 59” 25.76 Taurus
2023 Mar 25 04h 32m 18s +07° 47’ 14” 25.77 Taurus
2023 Mar 26 04h 32m 47s +07° 50’ 30” 25.79 Taurus
2023 Mar 27 04h 33m 15s +07° 53’ 44” 25.80 Taurus
2023 Mar 28 04h 33m 44s +07° 56’ 58” 25.82 Taurus
2023 Mar 29 04h 34m 14s +08° 00’ 11” 25.83 Taurus
2023 Mar 30 04h 34m 42s +08° 03’ 21” 25.85 Taurus
2023 Mar 31 04h 35m 12s +08° 06’ 30” 25.86 Taurus