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Comets » 

Comet 51P/Harrington

Above the horizon.  Rise: 8:35 | Tran: 15:52 | Set: 23:08
Alt: 2.57°   Az: 291.07°   Direction: West-North-West

Comet 51P/Harrington is in the constellation of Leo, at a distance of 936,705,699.0 kilometers from Earth. The current Right Ascension is 10h 23m 32s and the Declination is +14° 59’ 56” (apparent coordinates). The estimated magnitude of comet 51P/Harrington, computed using JPL Horizons's data, is 26.75.

Finder Charts

The sky charts below show, at different resolutions, the position of comet 51P/Harrington in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of comet 51P/Harrington in the constellation of Leo on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of comet 51P/Harrington in the constellation of Leo on F, d Y. Field of view: 15x9 degrees. View in interactive star map.

The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet 51P/Harrington against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.

51P/Harrington
RA: 10h 22m 10s
Dec: +15° 07’ 43”
Simplified high-resolution deep sky chart showing the current position of comet 51P/Harrington. Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

10h 23m 32s
+14° 59’ 56”
07h 00m 44s
17h 24m 17s

J2000

10h 22m 10s
+15° 07’ 43”

Additional Information

Leo
n/a
n/a
n/a
n/a
26.75

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.

Rise and Set Times

The following table lists today's rise, transit and set times of comet 51P/Harrington from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 75.0°
Max altitude: 53.5°
Azimuth: 285.0°

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.

Distance from Earth

The distance of comet 51P/Harrington from Earth is currently 936,705,699.0 kilometers, equivalent to 6.2614908529 Astronomical Units. Light takes 52m 4.514s to travel from comet 51P/Harrington and arrive to us.

936,705,699.0
6.2614908529
52m 4.514s

The following graph shows the distance of comet 51P/Harrington from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.

Chart of the distance of comet 51P/Harrington from Earth in Astronomical Units (au)
Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).

The value of the distance of 51P/Harrington from Earth is also available as a real time updated value in the live position tracker.

Closest Approach to Earth

In the period between January 1, 2000 and December 31, 2099, the closest approach of comet 51P/Harrington to Earth happened on Monday 5 September 2022 at a distance of 0.719952 Astronomical Units, or 107,703,271 kilometers:

Monday 5 September 2022
107,703,271
0.719952

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

Light Curve

The following chart shows the light curve of comet 51P/Harrington, i.e., its apparent magnitude as a function of time. The curve is calculated using the latest ephemerides provided by JPL Horizons. The magnitude data is sampled with the interval of 2 days. Because of this sampling, inaccuracies may occur for objects that have large variations of brightness over a few days. For comets, large discrepancies can arise between the calculated brightness and the observations due to their highly dynamic, and not always precisely predictable, behavior.

Chart of the magnitude of comet 51P/Harrington as a function of time

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. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
Jul 07 2025 10h 18m 39s +15° 30’ 54” 26.71 Leo
Jul 08 2025 10h 19m 15s +15° 27’ 04” 26.72 Leo
Jul 09 2025 10h 19m 51s +15° 23’ 12” 26.72 Leo
Jul 10 2025 10h 20m 28s +15° 19’ 20” 26.73 Leo
Jul 11 2025 10h 21m 05s +15° 15’ 25” 26.73 Leo
Jul 12 2025 10h 21m 43s +15° 11’ 30” 26.74 Leo
Jul 13 2025 10h 22m 20s +15° 07’ 33” 26.74 Leo
Jul 14 2025 10h 22m 58s +15° 03’ 34” 26.74 Leo
Jul 15 2025 10h 23m 36s +14° 59’ 35” 26.75 Leo
Jul 16 2025 10h 24m 14s +14° 55’ 35” 26.75 Leo
Jul 17 2025 10h 24m 53s +14° 51’ 34” 26.76 Leo
Jul 18 2025 10h 25m 31s +14° 47’ 31” 26.76 Leo
Jul 19 2025 10h 26m 10s +14° 43’ 28” 26.77 Leo
Jul 20 2025 10h 26m 49s +14° 39’ 23” 26.77 Leo

Additional Resources on TheSkyLive