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🌎 Location: Greenwich, United Kingdom [change]

Comet Leonard (C/2021 A1)

Comet Leonard (C/2021 A1) is currently in the constellation of Bootes. The current Right Ascension of Comet Leonard (C/2021 A1) is 14h 06m 57s and the Declination is +44° 57’ 01” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet Leonard (C/2021 A1) is 18.68 (JPL).

Summary of key facts about Comet Leonard (C/2021 A1) [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]:

14h 06m 57s
+44° 57’ 01”
  • Comet Leonard is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the North direction at an altitude of 7° above the horizon.
  • Given its current magnitude, Comet Leonard is visible only through long exposure photography.
  • See also Comet Leonard 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 Leonard (C/2021 A1) available on TheSkyLive:

Available Resources

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

Below we provide Comet Leonard (C/2021 A1) 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 Leonard (C/2021 A1) in Bootes on January, 24 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet Leonard (C/2021 A1) in Bootes on January, 24 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 Leonard (C/2021 A1) is right now. Click on the image to see a more detailed fullscreen tracker view.

Comet Leonard
RA: 14h 06m 57s
Dec: +44° 57’ 01”
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 669,714,297 kilometers, equivalent to 4.476764 Astronomical Units. Light takes 37 minutes and 13.9264 seconds to travel from Comet Leonard (C/2021 A1) and arrive to us.

37 minutes and 13.9264 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.

Distance of Comet Leonard (C/2021 A1) from Earth between January 2014 and January 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 Comet 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 January 2014 and January 2100, the closest approach of Comet Leonard (C/2021 A1) to Earth happens on Mon Dec 13 2021 at a distance of 0.233947 Astronomical Units, or 34,997,915 kilometers:

Mon Dec 13 2021

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

Comet Leonard (C/2021 A1) brightness

The current visual magnitude of Comet Leonard (C/2021 A1) is 18.68.


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 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.

Predicted magnitude of Comet Leonard (C/2021 A1) between January 2014 and January 2100

Comet Leonard (C/2021 A1) rise and set times

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

Comet Leonard (C/2021 A1) is circumpolar and transits at 05:51 UTC (altitude: 83.5°)

The rise and set times are defined as the time at which the upper limb of Comet Leonard (C/2021 A1) 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 Leonard (C/2021 A1) Orbital Elements

The following table lists the orbital elements of Comet Leonard (C/2021 A1) at epoch 27 October 2020 00:00 UTC (JD: 2459150.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00005304
Orbit inclination i 132.68548864°
Perihelion distance q 0.61483237 AU
91,977,614 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 06:59:10
2,459,582.7911 JD
Argument of perihelion peri 225.09074865487°
Longitude of the ascending node node 255.86682608784°
Mean anomaly M -0.00034134303566165°
Mean motion n 0.00000079°/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
2021 Jan 17 14h 06m 42s +43° 18’ 05” 18.86 Canes Venatici
2021 Jan 18 14h 06m 48s +43° 30’ 14” 18.84 Canes Venatici
2021 Jan 19 14h 06m 52s +43° 42’ 33” 18.81 Canes Venatici
2021 Jan 20 14h 06m 56s +43° 55’ 04” 18.79 Canes Venatici
2021 Jan 21 14h 06m 59s +44° 07’ 45” 18.77 Bootes
2021 Jan 22 14h 07m 00s +44° 20’ 35” 18.74 Bootes
2021 Jan 23 14h 07m 00s +44° 33’ 34” 18.72 Bootes
2021 Jan 24 14h 06m 59s +44° 46’ 45” 18.70 Bootes
2021 Jan 25 14h 06m 56s +45° 00’ 03” 18.67 Bootes
2021 Jan 26 14h 06m 52s +45° 13’ 32” 18.65 Canes Venatici
2021 Jan 27 14h 06m 47s +45° 27’ 11” 18.63 Canes Venatici
2021 Jan 28 14h 06m 41s +45° 40’ 58” 18.60 Canes Venatici
2021 Jan 29 14h 06m 33s +45° 54’ 55” 18.58 Canes Venatici
2021 Jan 30 14h 06m 24s +46° 08’ 59” 18.56 Canes Venatici