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🌎  Greenwich, United Kingdom [change]

Comet 110P/Hartley 3

Comet 110P/Hartley 3 is currently in the constellation of Cancer. The current Right Ascension of Comet 110P/Hartley 3 is 08h 40m 00s and the Declination is +18° 33’ 44” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet 110P/Hartley 3 is 16.08 (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]:

08h 40m 00s
+18° 33’ 44”

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 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 Cancer on November, 27 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet 110P/Hartley 3 in Cancer on November, 27 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: 08h 40m 00s
Dec: +18° 33’ 44”
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 276,308,457 kilometers, equivalent to 1.847008 Astronomical Units. Light takes 15 minutes and 21.6658 seconds to travel from Comet 110P/Hartley 3 and arrive to us.

15 minutes and 21.6658 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 1.494128 Astronomical Units, or 223,518,365 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 16.08.


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: 71.4°
Max altitude: 57.1°
Azimuth: 288.6°

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 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 Nov 20 08h 36m 52s +19° 21’ 35” 16.16 Cancer
2021 Nov 21 08h 37m 22s +19° 15’ 20” 16.15 Cancer
2021 Nov 22 08h 37m 50s +19° 09’ 08” 16.14 Cancer
2021 Nov 23 08h 38m 17s +19° 02’ 58” 16.13 Cancer
2021 Nov 24 08h 38m 40s +18° 56’ 52” 16.12 Cancer
2021 Nov 25 08h 39m 03s +18° 50’ 47” 16.11 Cancer
2021 Nov 26 08h 39m 25s +18° 44’ 44” 16.10 Cancer
2021 Nov 27 08h 39m 44s +18° 38’ 45” 16.09 Cancer
2021 Nov 28 08h 40m 03s +18° 32’ 50” 16.08 Cancer
2021 Nov 29 08h 40m 18s +18° 26’ 57” 16.07 Cancer
2021 Nov 30 08h 40m 33s +18° 21’ 07” 16.06 Cancer
2021 Dec 01 08h 40m 45s +18° 15’ 20” 16.05 Cancer
2021 Dec 02 08h 40m 56s +18° 09’ 38” 16.04 Cancer
2021 Dec 03 08h 41m 06s +18° 03’ 57” 16.03 Cancer