Your guide to the Solar System
🌎 Location: Greenwich, United Kingdom [change]
Comets » 

Comet 110P/Hartley 3

Available Resources

Comet 110P/Hartley 3 Position

Comet 110P/Hartley 3 is currently in the constellation of Aquarius. The current Right Ascension is 20h 57m 24s and the Declination is -11° 03’ 17”.

20h 57m 24s
-11° 03’ 17”

Simplified sky chart showing where Comet 110P/Hartley 3 is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet 110P/Hartley 3 in Aquarius on July, 22 2019
Field of view: 60x30 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]

Hihgher precision deep sky finder chart showing where Comet 110P/Hartley 3 is right now (view fullscreen)

110P/Hartley 3
RA: 20h 57m 24s
Dec: -11° 03’ 17”
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

The distance of Comet 110P/Hartley 3 from Earth is currently 504,865,157 kilometers, equivalent to 3.374815 Astronomical Units. Light takes 28 minutes and 4.0489 seconds to travel from Comet 110P/Hartley 3 and arrive to us.

28 minutes and 4.0489 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 1.49411902 Astronomical Units, or 223,517,024 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 22.71.


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 behvior 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: 101.1°
Max altitude: 27.5°
Azimuth: 258.9°
Comet 110P/Hartley 3 is below the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet 110P/Hartley 3 touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere 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 07 September 2011 00:00 UTC (JD: 2455812.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31348058
Orbit inclination i 11.68733184°
Perihelion distance q 2.48099115 AU
371,150,995 km
Aphelion distance Q 4.74674656 AU
710,103,179 km
Semi-major axis a 3.61386885 AU
540,627,087 km
Orbital period period 6.8700 years
2,509.3256 days
Date of perihelion transit Tp 2014-Dec-18 00:28:07
2,457,009.5195 JD
Next perihelion transit 2021-Oct-31 08:16
2,459,518.8451 JD
Argument of perihelion peri 167.59582598398°
Longitude of the ascending node node 287.70603608175°
Mean anomaly M 188.26977894764°
Mean motion n 0.14346484°/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
2019 Jul 15 21h 02m 08s -10° 57’ 33” 22.77 Aquarius
2019 Jul 16 21h 01m 32s -10° 58’ 09” 22.77 Aquarius
2019 Jul 17 21h 00m 56s -10° 58’ 48” 22.76 Aquarius
2019 Jul 18 21h 00m 19s -10° 59’ 30” 22.75 Aquarius
2019 Jul 19 20h 59m 40s -11° 00’ 15” 22.74 Aquarius
2019 Jul 20 20h 59m 03s -11° 01’ 03” 22.73 Aquarius
2019 Jul 21 20h 58m 24s -11° 01’ 54” 22.73 Aquarius
2019 Jul 22 20h 57m 46s -11° 02’ 47” 22.72 Aquarius
2019 Jul 23 20h 57m 06s -11° 03’ 43” 22.71 Aquarius
2019 Jul 24 20h 56m 26s -11° 04’ 42” 22.70 Aquarius
2019 Jul 25 20h 55m 46s -11° 05’ 44” 22.70 Aquarius
2019 Jul 26 20h 55m 06s -11° 06’ 48” 22.69 Aquarius
2019 Jul 27 20h 54m 25s -11° 07’ 55” 22.68 Aquarius
2019 Jul 28 20h 53m 44s -11° 09’ 05” 22.68 Aquarius