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Comet 110P/Hartley 3

Comet 110P/Hartley 3 is currently in the constellation of Aries. The current Right Ascension of Comet 110P/Hartley 3 is 02h 54m 48s and the Declination is +24° 13’ 48” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 110P/Hartley 3 is 18.09 (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]:

02h 54m 48s
+24° 13’ 48”

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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 Aries on May, 06 2021
Field of view: 50x30 degrees
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Map showing Comet 110P/Hartley 3 in Aries on May, 06 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 110P/Hartley 3 is right now. Click on the image to see a more detailed fullscreen tracker view.

110P/Hartley 3
RA: 02h 54m 48s
Dec: +24° 13’ 48”
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 545,719,376 kilometers, equivalent to 3.647909 Astronomical Units. Light takes 30 minutes and 20.3239 seconds to travel from Comet 110P/Hartley 3 and arrive to us.

30 minutes and 20.3239 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 223,517,931 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 18.09.


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: 65.8°
Max altitude: 62.8°
Azimuth: 294.3°

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 29 April 2015 00:00 UTC (JD: 2457142.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31495894
Orbit inclination i 11.69076167°
Perihelion distance q 2.47530227 AU
370,299,950 km
Aphelion distance Q 4.75142442 AU
710,802,978 km
Semi-major axis a 3.61336335 AU
540,551,464 km
Orbital period period 6.8700 years
2,508.7991 days
Date of perihelion transit Tp 2014-Dec-17 18:50:06
2,457,009.2848 JD
Next perihelion transit 2021-Oct-30 14:00
2,459,518.0839 JD
Argument of perihelion peri 167.74677608128°
Longitude of the ascending node node 287.71206230852°
Mean anomaly M 19.115709268378°
Mean motion n 0.14349495°/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
2021 Apr 29 02h 41m 14s +23° 26’ 20” 18.14 Aries
2021 Apr 30 02h 43m 08s +23° 33’ 07” 18.14 Aries
2021 May 01 02h 45m 01s +23° 39’ 52” 18.13 Aries
2021 May 02 02h 46m 54s +23° 46’ 35” 18.12 Aries
2021 May 03 02h 48m 48s +23° 53’ 14” 18.11 Aries
2021 May 04 02h 50m 43s +23° 59’ 52” 18.10 Aries
2021 May 05 02h 52m 36s +24° 06’ 25” 18.10 Aries
2021 May 06 02h 54m 32s +24° 12’ 56” 18.09 Aries
2021 May 07 02h 56m 26s +24° 19’ 24” 18.08 Aries
2021 May 08 02h 58m 22s +24° 25’ 50” 18.07 Aries
2021 May 09 03h 00m 16s +24° 32’ 12” 18.06 Aries
2021 May 10 03h 02m 12s +24° 38’ 30” 18.06 Aries
2021 May 11 03h 04m 09s +24° 44’ 47” 18.05 Aries
2021 May 12 03h 06m 06s +24° 50’ 58” 18.04 Aries