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🌎  Greenwich, United Kingdom [change]

Comet 71P/Clark

Comet 71P/Clark is currently in the constellation of Leo. The current Right Ascension of Comet 71P/Clark is 10h 49m 50s and the Declination is +18° 33’ 38” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 71P/Clark is 20.57 (JPL).

Summary of key facts about Comet 71P/Clark [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]:

10h 49m 50s
+18° 33’ 38”
  • 71P/Clark is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the West direction at an altitude of 24° above the horizon.
  • Given its current magnitude, 71P/Clark is visible only through long exposure photography.
  • See also 71P/Clark 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 71P/Clark available on TheSkyLive:

Available Resources

Comet 71P/Clark Position and Finder Charts

Below we provide Comet 71P/Clark 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 71P/Clark in Leo on December, 09 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet 71P/Clark in Leo on December, 09 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 71P/Clark is right now. Click on the image to see a more detailed fullscreen tracker view.

RA: 10h 49m 50s
Dec: +18° 33’ 38”
Deep sky finder chart for Comet 71P/Clark
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 71P/Clark?, a page that provides all the information needed to find Comet 71P/Clark in the sky and additional links to sky charts.

Comet 71P/Clark Distance from Earth

The distance of Comet 71P/Clark from Earth is currently 464,186,624 kilometers, equivalent to 3.102896 Astronomical Units. Light takes 25 minutes and 48.3599 seconds to travel from Comet 71P/Clark and arrive to us.

25 minutes and 48.3599 seconds

The following chart shows the distance of Comet 71P/Clark 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 71P/Clark 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 71P/Clark from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 71P/Clark to Earth

Between January 2013 and December 2100, the closest approach of Comet 71P/Clark to Earth happens on Sun Jun 11 2017 at a distance of 0.589860 Astronomical Units, or 88,241,793 kilometers:

Sun Jun 11 2017

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

Comet 71P/Clark brightness

The current visual magnitude of Comet 71P/Clark is 20.57.


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 71P/Clark, 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 71P/Clark between January 2013 and December 2100

Comet 71P/Clark 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 71P/Clark rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 71.4°
Max altitude: 57.1°
Azimuth: 288.6°

The rise and set times are defined as the time at which the upper limb of Comet 71P/Clark 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 71P/Clark Orbital Elements

The following table lists the orbital elements of Comet 71P/Clark at epoch 25 May 2017 00:00 UTC (JD: 2457899.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.49437814
Orbit inclination i 9.44534059°
Perihelion distance q 1.58621399 AU
237,294,236 km
Aphelion distance Q 4.68809542 AU
701,329,094 km
Semi-major axis a 3.13715471 AU
469,311,665 km
Orbital period period 5.5566 years
2,029.5620 days
Date of perihelion transit Tp 2017-Jun-30 04:53:53
2,457,934.7041 JD
Next perihelion transit 2023-Jan-19 18:23
2,459,964.2661 JD
Argument of perihelion peri 208.91678674111°
Longitude of the ascending node node 59.446279947463°
Mean anomaly M 353.75556367838°
Mean motion n 0.17737817°/day

Visualization of Comet 71P/Clark Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 71P/Clark with respect of the Sun and the orbits of the major planets. The position of Comet 71P/Clark 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!

Comet 71P/Clark 15 Days Ephemeris

The following table lists the ephemerides of Comet 71P/Clark computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 71P/Clark in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 Dec 02 10h 45m 55s +18° 31’ 41” 20.71 Leo
2021 Dec 03 10h 46m 30s +18° 31’ 36” 20.69 Leo
2021 Dec 04 10h 47m 03s +18° 31’ 36” 20.67 Leo
2021 Dec 05 10h 47m 35s +18° 31’ 44” 20.66 Leo
2021 Dec 06 10h 48m 07s +18° 31’ 58” 20.64 Leo
2021 Dec 07 10h 48m 38s +18° 32’ 18” 20.62 Leo
2021 Dec 08 10h 49m 09s +18° 32’ 47” 20.60 Leo
2021 Dec 09 10h 49m 37s +18° 33’ 23” 20.58 Leo
2021 Dec 10 10h 50m 06s +18° 34’ 05” 20.56 Leo
2021 Dec 11 10h 50m 32s +18° 34’ 54” 20.54 Leo
2021 Dec 12 10h 50m 59s +18° 35’ 51” 20.52 Leo
2021 Dec 13 10h 51m 24s +18° 36’ 55” 20.50 Leo
2021 Dec 14 10h 51m 48s +18° 38’ 06” 20.48 Leo
2021 Dec 15 10h 52m 13s +18° 39’ 24” 20.46 Leo