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Comet 51P/Harrington

Comet 51P/Harrington is currently in the constellation of Libra. The current Right Ascension of Comet 51P/Harrington is 14h 25m 55s and the Declination is -09° 28’ 32” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 51P/Harrington is 23.21 (JPL).

Summary of key facts about Comet 51P/Harrington [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 25m 55s
-09° 28’ 32”

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Additional information about Comet 51P/Harrington available on TheSkyLive:

Available Resources

Comet 51P/Harrington Position and Finder Charts

Below we provide Comet 51P/Harrington 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 51P/Harrington in Libra on May, 18 2021
Field of view: 50x30 degrees
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Map showing Comet 51P/Harrington in Libra on May, 18 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 51P/Harrington is right now. Click on the image to see a more detailed fullscreen tracker view.

RA: 14h 25m 55s
Dec: -09° 28’ 32”
Deep sky finder chart for Comet 51P/Harrington
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 51P/Harrington?, a page that provides all the information needed to find Comet 51P/Harrington in the sky and additional links to sky charts.

Comet 51P/Harrington Distance from Earth

The distance of Comet 51P/Harrington from Earth is currently 462,458,868 kilometers, equivalent to 3.091347 Astronomical Units. Light takes 25 minutes and 42.5967 seconds to travel from Comet 51P/Harrington and arrive to us.

25 minutes and 42.5967 seconds

The following chart shows the distance of Comet 51P/Harrington 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 51P/Harrington 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 51P/Harrington from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 51P/Harrington to Earth

Between January 2013 and December 2100, the closest approach of Comet 51P/Harrington to Earth happens on Mon Sep 5 2022 at a distance of 0.719963 Astronomical Units, or 107,704,921 kilometers:

Mon Sep 5 2022

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

Comet 51P/Harrington brightness

The current visual magnitude of Comet 51P/Harrington is 23.21.


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 51P/Harrington, 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 51P/Harrington between January 2013 and December 2100

Comet 51P/Harrington 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 51P/Harrington rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 99.5°
Max altitude: 29.1°
Azimuth: 260.5°

The rise and set times are defined as the time at which the upper limb of Comet 51P/Harrington 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 51P/Harrington 15 Days Ephemeris

The following table lists the ephemerides of Comet 51P/Harrington computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 51P/Harrington in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 May 11 14h 31m 21s -09° 49’ 00” 23.28 Libra
2021 May 12 14h 30m 35s -09° 46’ 08” 23.27 Libra
2021 May 13 14h 29m 52s -09° 43’ 17” 23.26 Libra
2021 May 14 14h 29m 08s -09° 40’ 28” 23.25 Libra
2021 May 15 14h 28m 24s -09° 37’ 44” 23.24 Libra
2021 May 16 14h 27m 42s -09° 35’ 02” 23.23 Libra
2021 May 17 14h 26m 58s -09° 32’ 21” 23.22 Libra
2021 May 18 14h 26m 16s -09° 29’ 44” 23.21 Libra
2021 May 19 14h 25m 33s -09° 27’ 11” 23.20 Libra
2021 May 20 14h 24m 51s -09° 24’ 42” 23.19 Libra
2021 May 21 14h 24m 11s -09° 22’ 15” 23.19 Libra
2021 May 22 14h 23m 30s -09° 19’ 53” 23.18 Libra
2021 May 23 14h 22m 50s -09° 17’ 34” 23.17 Libra
2021 May 24 14h 22m 10s -09° 15’ 19” 23.16 Libra