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🌎 Location: Greenwich, United Kingdom [change]

Comet 110P/Hartley 3

Comet 110P/Hartley 3 is currently in the constellation of Pegasus. The current Right Ascension of Comet 110P/Hartley 3 is 23h 23m 57s and the Declination is +13° 15’ 02” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 110P/Hartley 3 is 18.27 (JPL).

Summary of key facts about Comet 110P/Hartley 3 [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]:

23h 23m 57s
+13° 15’ 02”

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Additional information about Comet 110P/Hartley 3 available on TheSkyLive:

Available Resources

Comet 110P/Hartley 3 Position and Finder Charts

Below we provide Comet 110P/Hartley 3 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 110P/Hartley 3 in Pegasus on October, 27 2020
Field of view: 50x30 degrees
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Map showing Comet 110P/Hartley 3 in Pegasus on October, 27 2020
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 110P/Hartley 3 is right now. Click on the image to see a more detailed fullscreen tracker view.

110P/Hartley 3
RA: 23h 23m 57s
Dec: +13° 15’ 02”
Deep sky finder chart for Comet 110P/Hartley 3
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 110P/Hartley 3?, a page that provides all the information needed to find Comet 110P/Hartley 3 in the sky and additional links to sky charts.

Comet 110P/Hartley 3 Distance from Earth

The distance of Comet 110P/Hartley 3 from Earth is currently 351,412,725 kilometers, equivalent to 2.349049 Astronomical Units. Light takes 19 minutes and 32.1867 seconds to travel from Comet 110P/Hartley 3 and arrive to us.

19 minutes and 32.1867 seconds

The following chart shows the distance of Comet 110P/Hartley 3 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 110P/Hartley 3 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 110P/Hartley 3 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 110P/Hartley 3 to Earth

Between January 2013 and December 2100, the closest approach of Comet 110P/Hartley 3 to Earth happens on Wed Dec 31 2014 at a distance of 1.494125 Astronomical Units, or 223,517,860 kilometers:

Wed Dec 31 2014

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

Comet 110P/Hartley 3 brightness

The current visual magnitude of Comet 110P/Hartley 3 is 18.27.


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 110P/Hartley 3, 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 110P/Hartley 3 between January 2013 and December 2100

Comet 110P/Hartley 3 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 110P/Hartley 3 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 76.8°
Max altitude: 51.7°
Azimuth: 283.3°

The rise and set times are defined as the time at which the upper limb of Comet 110P/Hartley 3 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 110P/Hartley 3 Orbital Elements

The following table lists the orbital elements of Comet 110P/Hartley 3 at epoch 23 January 2015 00:00 UTC (JD: 2457046.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31466406
Orbit inclination i 11.69285822°
Perihelion distance q 2.47536181 AU
370,308,856 km
Aphelion distance Q 4.74842923 AU
710,354,904 km
Semi-major axis a 3.61189552 AU
540,331,880 km
Orbital period period 6.8600 years
2,507.2705 days
Date of perihelion transit Tp 2014-Dec-17 18:51:31
2,457,009.2858 JD
Next perihelion transit 2021-Oct-29 01:21
2,459,516.5563 JD
Argument of perihelion peri 167.74775760906°
Longitude of the ascending node node 287.7146827178°
Mean anomaly M 5.3433075800195°
Mean motion n 0.14358243°/day

Visualization of Comet 110P/Hartley 3 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 110P/Hartley 3 with respect of the Sun and the orbits of the major planets. The position of Comet 110P/Hartley 3 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 110P/Hartley 3
View Comet 110P/Hartley 3 in the 3D Solar System Simulator

Comet 110P/Hartley 3 15 Days Ephemeris

The following table lists the ephemerides of Comet 110P/Hartley 3 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 110P/Hartley 3 in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Oct 20 23h 27m 06s +13° 54’ 52” 18.30 Pegasus
2020 Oct 21 23h 26m 36s +13° 49’ 26” 18.29 Pegasus
2020 Oct 22 23h 26m 08s +13° 43’ 59” 18.29 Pegasus
2020 Oct 23 23h 25m 41s +13° 38’ 35” 18.29 Pegasus
2020 Oct 24 23h 25m 15s +13° 33’ 11” 18.28 Pegasus
2020 Oct 25 23h 24m 51s +13° 27’ 47” 18.28 Pegasus
2020 Oct 26 23h 24m 28s +13° 22’ 27” 18.27 Pegasus
2020 Oct 27 23h 24m 06s +13° 17’ 09” 18.27 Pegasus
2020 Oct 28 23h 23m 44s +13° 11’ 53” 18.27 Pegasus
2020 Oct 29 23h 23m 25s +13° 06’ 41” 18.26 Pegasus
2020 Oct 30 23h 23m 07s +13° 01’ 32” 18.26 Pegasus
2020 Oct 31 23h 22m 49s +12° 56’ 25” 18.26 Pegasus
2020 Nov 01 23h 22m 32s +12° 51’ 21” 18.26 Pegasus
2020 Nov 02 23h 22m 18s +12° 46’ 23” 18.25 Pegasus