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Comets » 

Comet 110P/Hartley

Above the horizon.  Rise: 5:37 | Tran: 9:08 | Set: 12:39
Alt: 4.71°   Az: 143.13°   Direction: South-East

Comet 110P/Hartley is in the constellation of Sagittarius, at a distance of 806,755,369.0 kilometers from Earth. The current Right Ascension is 18h 50m 58s and the Declination is -25° 36’ 48” (apparent coordinates). The predicted magnitude of Comet 110P/Hartley is 26.07 (data provided by JPL Horizons).

Finder Charts

Map showing Comet 110P/Hartley in Sagittarius on February, 15 2025. Field of view: 50x30 degrees
View interactive star map
Sky map showing Comet 110P/Hartley in Sagittarius on February, 15 2025. Field of view: 15x9 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Comet 110P/Hartley is right now. Click on the image to see a more detailed fullscreen tracker view.

110P/Hartley
RA: 18h 49m 25s
Dec: -25° 38’ 37”
Deep sky finder chart for Comet 110P/Hartley. Field of view: 60x40 arcmins. View in deep sky object tracker

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

Celestial Coordinates

Apparent

18h 50m 58s
-25° 36’ 48”
21h 13m 49s
16h 04m 47s

J2000

18h 49m 25s
-25° 38’ 37”

Additional Information

Sagittarius
n/a
n/a
n/a
n/a
26.07

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

Today's rise, transit and set times of Comet 110P/Hartley from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 115.6°
Max altitude: 12.9°
Azimuth: 244.4°
  • 110P/Hartley is above the horizon from Greenwich, UK.
  • Right now it is placed in the South-East direction at an altitude of 4.71° above the horizon.
  • Given its current magnitude, 110P/Hartley is visible only through long exposure photography.
  • Go to interactive sky chart

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 110P/Hartley from Earth is currently 806,755,369.0 kilometers, equivalent to 5.3928265504 Astronomical Units. Light takes 44m 51.046s to travel from Comet 110P/Hartley and arrive to us.

806,755,369.0
5.3928265504
44m 51.046s

The following chart shows the distance of Comet 110P/Hartley 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.

Chart of the distance of Comet 110P/Hartley from Earth in Astronomical Units (au)

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 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 2000 and 31 December 2099, the closest approach of Comet 110P/Hartley to Earth happens on Wed Dec 31 2014 at a distance of 1.494126 Astronomical Units, or 223,518,038 kilometers:

Wed Dec 31 2014
223,518,038
1.494126

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

Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet 110P/Hartley, 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.

Chart of the magnitude of Comet 110P/Hartley as a function of time

Orbital Elements

The following table lists the orbital elements of Comet 110P/Hartley at epoch 07 May 2018 00:00 UTC (JD: 2458246.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31628027
Orbit inclination i 11.69836175°
Perihelion distance q 2.46445016 AU
368,676,497 km
Aphelion distance Q 4.74449837 AU
709,766,855 km
Semi-major axis a 3.60447426 AU
539,221,676 km
Orbital period period 6.8434 years
2,499.5471 days
Date of perihelion transit Tp 2014-Dec-16 16:15:29
2,457,008.1774 JD
Next perihelion transit 2021-Oct-20 05:23
2,459,507.7245 JD
Argument of perihelion peri 167.39561172405°
Longitude of the ascending node node 287.52957296521°
Mean anomaly M 178.35076247938°
Mean motion n 0.14402609°/day

Orbit Visualization

Orbit Diagram of Comet 110P/Hartley
View Comet 110P/Hartley in the 3D Solar System Simulator

15 Days Ephemeris

The following table lists the ephemerides of Comet 110P/Hartley 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
2025 Feb 08 18h 44m 27s -25° 47’ 37” 26.09 Sagittarius
2025 Feb 09 18h 45m 22s -25° 46’ 09” 26.09 Sagittarius
2025 Feb 10 18h 46m 17s -25° 44’ 41” 26.09 Sagittarius
2025 Feb 11 18h 47m 11s -25° 43’ 12” 26.08 Sagittarius
2025 Feb 12 18h 48m 05s -25° 41’ 43” 26.08 Sagittarius
2025 Feb 13 18h 48m 59s -25° 40’ 13” 26.07 Sagittarius
2025 Feb 14 18h 49m 52s -25° 38’ 42” 26.07 Sagittarius
2025 Feb 15 18h 50m 44s -25° 37’ 12” 26.07 Sagittarius
2025 Feb 16 18h 51m 37s -25° 35’ 40” 26.06 Sagittarius
2025 Feb 17 18h 52m 28s -25° 34’ 08” 26.06 Sagittarius
2025 Feb 18 18h 53m 19s -25° 32’ 37” 26.05 Sagittarius
2025 Feb 19 18h 54m 10s -25° 31’ 04” 26.05 Sagittarius
2025 Feb 20 18h 55m 01s -25° 29’ 31” 26.04 Sagittarius
2025 Feb 21 18h 55m 51s -25° 27’ 58” 26.04 Sagittarius

Additional Resources