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🌎  Greenwich, United Kingdom [change]

Comet 51P/Harrington

Comet 51P/Harrington is currently in the constellation of Sagittarius. The current Right Ascension of Comet 51P/Harrington is 17h 57m 31s and the Declination is -22° 58’ 13” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 51P/Harrington is 20.13 (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]:

17h 57m 31s
-22° 58’ 13”
  • 51P/Harrington is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-South-West direction at an altitude of 13° above the horizon.
  • Given its current magnitude, 51P/Harrington is visible only through long exposure photography.
  • See also 51P/Harrington 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 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 Sagittarius on January, 25 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Comet 51P/Harrington in Sagittarius on January, 25 2022
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: 17h 57m 31s
Dec: -22° 58’ 13”
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 523,128,281 kilometers, equivalent to 3.496897 Astronomical Units. Light takes 29 minutes and 4.9681 seconds to travel from Comet 51P/Harrington and arrive to us.

29 minutes and 4.9681 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 20.13.


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: 113.0°
Max altitude: 15.6°
Azimuth: 247.0°

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
2022 Jan 18 17h 44m 11s -22° 48’ 51” 20.33 Sagittarius
2022 Jan 19 17h 45m 56s -22° 50’ 18” 20.30 Sagittarius
2022 Jan 20 17h 47m 44s -22° 51’ 43” 20.27 Sagittarius
2022 Jan 21 17h 49m 31s -22° 53’ 03” 20.25 Sagittarius
2022 Jan 22 17h 51m 19s -22° 54’ 20” 20.22 Sagittarius
2022 Jan 23 17h 53m 06s -22° 55’ 32” 20.20 Sagittarius
2022 Jan 24 17h 54m 53s -22° 56’ 39” 20.17 Sagittarius
2022 Jan 25 17h 56m 40s -22° 57’ 42” 20.14 Sagittarius
2022 Jan 26 17h 58m 28s -22° 58’ 41” 20.12 Sagittarius
2022 Jan 27 18h 00m 16s -22° 59’ 36” 20.09 Sagittarius
2022 Jan 28 18h 02m 04s -23° 00’ 27” 20.06 Sagittarius
2022 Jan 29 18h 03m 54s -23° 01’ 14” 20.04 Sagittarius
2022 Jan 30 18h 05m 41s -23° 01’ 55” 20.01 Sagittarius
2022 Jan 31 18h 07m 31s -23° 02’ 34” 19.98 Sagittarius