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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:45  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
wb_twilight Civil TwilightWhat's Visible Now?
Comets » 

Comet C/2021 Y1 (ATLAS)

Altitude: -35.6°   Azimuth: 234.2°   Direction: South-West

Comet C/2021 Y1 (ATLAS) is currently in the constellation of Lupus.

The current Right Ascension of Comet C/2021 Y1 (ATLAS) is 15h 11m 05s and the Declination is -48° 46’ 15” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom edit_location_alt). The current estimated magnitude of Comet C/2021 Y1 (ATLAS) is 17.31 (JPL).

15h 11m 05s
-48° 46’ 15”

The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted 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.

Today's rise, transit and set times of Comet C/2021 Y1 (ATLAS) from Greenwich, United Kingdom edit_location_alt (all times relative to the local timezone Europe/London):

Today Comet C/2021 Y1 (ATLAS) is not visible from Greenwich, United Kingdom edit_location_alt

  • C/2021 Y1 (ATLAS) is below the horizon from Greenwich, United Kingdom edit_location_alt.
  • Given its current magnitude, C/2021 Y1 (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 Y1 (ATLAS) Position and Finder Charts

Below we provide Comet C/2021 Y1 (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.

Finder chart of C/2021 Y1 (ATLAS) in Lupus on December,04 2023
Map showing Comet C/2021 Y1 (ATLAS) in Lupus on December, 04 2023
Field of view: 50x30 degrees
View fullscreen
Finder chart of C/2021 Y1 (ATLAS)
Map showing Comet C/2021 Y1 (ATLAS) in Lupus on December, 04 2023
Field of view: 10x6 degrees
View fullscreen

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2021 Y1 (ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 Y1 (ATLAS)
RA: 15h 11m 05s
Dec: -48° 46’ 15”
Deep sky finder chart for Comet C/2021 Y1 (ATLAS)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2021 Y1 (ATLAS)?, a page that provides all the information needed to find Comet C/2021 Y1 (ATLAS) in the sky and additional links to sky charts.

Comet C/2021 Y1 (ATLAS) Distance from Earth

The distance of Comet C/2021 Y1 (ATLAS) from Earth is currently 600,891,022 kilometers, equivalent to 4.016708 Astronomical Units. Light takes 33 minutes and 24.3567 seconds to travel from Comet C/2021 Y1 (ATLAS) and arrive to us.

33 minutes and 24.3567 seconds

The following chart shows the distance of Comet C/2021 Y1 (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 Y1 (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 Y1 (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 Y1 (ATLAS) to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet C/2021 Y1 (ATLAS) to Earth happens on Tue Dec 13 2022 at a distance of 1.688418 Astronomical Units, or 252,583,802 kilometers:

Tue Dec 13 2022

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

Comet C/2021 Y1 (ATLAS) Brightness and Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2021 Y1 (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 Y1 (ATLAS) as a function of time

Comet C/2021 Y1 (ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2021 Y1 (ATLAS) at epoch 30 September 2022 00:00 UTC (JD: 2459853.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00081952
Orbit inclination i 77.18706556°
Perihelion distance q 2.03252901 AU
304,062,012 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2023-Apr-30 16:44:05
2,460,065.1973 JD
Argument of perihelion peri 245.8097772486°
Longitude of the ascending node node 244.76964317487°
Mean anomaly M -0.001689274596584°
Mean motion n 0.00000798°/day

Visualization of Comet C/2021 Y1 (ATLAS) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 Y1 (ATLAS) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 Y1 (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 Y1 (ATLAS)
View Comet C/2021 Y1 (ATLAS) in the 3D Solar System Simulator

Comet C/2021 Y1 (ATLAS) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2021 Y1 (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 Y1 (ATLAS) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2023 Nov 27 14h 57m 12s -48° 52’ 45” 17.24 Lupus
2023 Nov 28 14h 59m 03s -48° 51’ 52” 17.25 Lupus
2023 Nov 29 15h 00m 55s -48° 51’ 02” 17.26 Lupus
2023 Nov 30 15h 02m 44s -48° 50’ 11” 17.27 Lupus
2023 Dec 01 15h 04m 33s -48° 49’ 19” 17.28 Lupus
2023 Dec 02 15h 06m 21s -48° 48’ 29” 17.28 Lupus
2023 Dec 03 15h 08m 08s -48° 47’ 39” 17.29 Lupus
2023 Dec 04 15h 09m 55s -48° 46’ 48” 17.30 Lupus
2023 Dec 05 15h 11m 39s -48° 45’ 57” 17.31 Lupus
2023 Dec 06 15h 13m 24s -48° 45’ 07” 17.32 Lupus
2023 Dec 07 15h 15m 07s -48° 44’ 17” 17.33 Lupus
2023 Dec 08 15h 16m 50s -48° 43’ 27” 17.34 Lupus
2023 Dec 09 15h 18m 32s -48° 42’ 38” 17.34 Lupus
2023 Dec 10 15h 20m 12s -48° 41’ 49” 17.35 Lupus