We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support helps us pay the server bills » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sunny DaytimeWhat's Visible Now?
Comets » 

Comet Leonard (C/2021 A1)

Altitude: 6.6°   Azimuth: 241.6°   Direction: West-South-West

Comet Leonard (C/2021 A1) is currently in the constellation of Ophiucus, at a distance of 1,313,214,363 kilometers from Earth.

Finder chart of C/2021 A1 (Leonard) in Ophiucus on March,01 2024
Map showing Comet Leonard (C/2021 A1) in Ophiucus on March, 01 2024. Field of view: 50x30 degrees
View interactive star map
The current Right Ascension of Comet Leonard (C/2021 A1) is 16h 49m 51s and the Declination is -11° 46’ 09” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom edit_location_alt). The current estimated magnitude of Comet Leonard (C/2021 A1) is 21.47 (JPL).

16h 49m 51s
-11° 46’ 09”
Ophiucus
n/a
n/a
n/a
n/a
21.47

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 Leonard (C/2021 A1) from Greenwich, United Kingdom edit_location_alt (all times relative to the local timezone Europe/London):

Azimuth: 101.8°
Max altitude: 26.7°
Azimuth: 258.2°
  • C/2021 A1 (Leonard) is above the horizon from Greenwich, United Kingdom edit_location_alt.
  • Right now it is placed in the West-South-West direction at an altitude of 7° above the horizon.
  • Given its current magnitude, C/2021 A1 (Leonard) 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.

Additional Resources

Comet Leonard (C/2021 A1) Position and Finder Charts

Finder chart of C/2021 A1 (Leonard)
Map showing Comet Leonard (C/2021 A1) in Ophiucus on March, 01 2024
Field of view: 10x6 degrees
View fullscreen

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet Leonard (C/2021 A1) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2021 A1 (Leonard)
RA: 16h 49m 51s
Dec: -11° 46’ 09”
Deep sky finder chart for Comet Leonard (C/2021 A1)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet Leonard (C/2021 A1)?, a page that provides all the information needed to find Comet Leonard (C/2021 A1) in the sky and additional links to sky charts.

Comet Leonard (C/2021 A1) Distance from Earth

The distance of Comet Leonard (C/2021 A1) from Earth is currently 1,313,214,363 kilometers, equivalent to 8.778296 Astronomical Units. Light takes 1 hours, 13 minutes and 0.4116 seconds to travel from Comet Leonard (C/2021 A1) and arrive to us.

1,313,214,363
8.778296
1 hours, 13 minutes and 0.4116 seconds

The following chart shows the distance of Comet Leonard (C/2021 A1) 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 Leonard (C/2021 A1) 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 A1 (Leonard) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Comet Leonard (C/2021 A1) to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet Leonard (C/2021 A1) to Earth happens on Mon Dec 13 2021 at a distance of 0.233994 Astronomical Units, or 35,005,002 kilometers:

Mon Dec 13 2021
35,005,002
0.233994

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

Comet Leonard (C/2021 A1) Brightness and Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet Leonard (C/2021 A1), 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 Leonard (C/2021 A1) as a function of time

Comet Leonard (C/2021 A1) Orbital Elements

The following table lists the orbital elements of Comet Leonard (C/2021 A1) at epoch 10 July 2021 00:00 UTC (JD: 2459406.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00010051
Orbit inclination i 132.68581276°
Perihelion distance q 0.61523023 AU
92,037,132 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2022-Jan-03 07:01:27
2,459,582.7927 JD
Argument of perihelion peri 225.0877083271°
Longitude of the ascending node node 255.8891008128°
Mean anomaly M -0.00036284404038465°
Mean motion n 0.00000206°/day

Visualization of Comet Leonard (C/2021 A1) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet Leonard (C/2021 A1) with respect of the Sun and the orbits of the major planets. The position of Comet Leonard (C/2021 A1) 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 Leonard (C/2021 A1)
View Comet Leonard (C/2021 A1) in the 3D Solar System Simulator

Comet Leonard (C/2021 A1) 15 Days Ephemeris

The following table lists the ephemerides of Comet Leonard (C/2021 A1) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet Leonard (C/2021 A1) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2024 Feb 23 16h 49m 50s -12° 00’ 02” 21.47 Ophiucus
2024 Feb 24 16h 49m 51s -11° 58’ 14” 21.47 Ophiucus
2024 Feb 25 16h 49m 53s -11° 56’ 23” 21.47 Ophiucus
2024 Feb 26 16h 49m 54s -11° 54’ 33” 21.47 Ophiucus
2024 Feb 27 16h 49m 54s -11° 52’ 41” 21.47 Ophiucus
2024 Feb 28 16h 49m 54s -11° 50’ 48” 21.47 Ophiucus
2024 Feb 29 16h 49m 53s -11° 48’ 55” 21.47 Ophiucus
2024 Mar 01 16h 49m 51s -11° 46’ 59” 21.47 Ophiucus
2024 Mar 02 16h 49m 50s -11° 45’ 02” 21.47 Ophiucus
2024 Mar 03 16h 49m 47s -11° 43’ 05” 21.47 Ophiucus
2024 Mar 04 16h 49m 45s -11° 41’ 06” 21.47 Ophiucus
2024 Mar 05 16h 49m 41s -11° 39’ 06” 21.47 Ophiucus
2024 Mar 06 16h 49m 39s -11° 37’ 05” 21.47 Ophiucus
2024 Mar 07 16h 49m 33s -11° 35’ 03” 21.47 Ophiucus