Comet 110P/Hartley
Comet 110P/Hartley is in the constellation of
Sagittarius,
at a distance of
Finder Charts
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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.
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
J2000
Additional Information
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):
- 110P/Hartley is above the horizon from Greenwich, UK.
- Right now it is placed in the South-West direction at an altitude of 1.50° above the horizon.
- Given its current magnitude, 110P/Hartley is visible only through long exposure photography.
- Go to interactive sky chart
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Distance from Earth
The distance of Comet 110P/Hartley from Earth is currently
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.
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:
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.
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 |
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 May 09 | 19h 28m 19s | -23° 54’ 02” | 25.51 | Sagittarius |
| 2025 May 10 | 19h 28m 12s | -23° 53’ 35” | 25.50 | Sagittarius |
| 2025 May 11 | 19h 28m 04s | -23° 53’ 08” | 25.49 | Sagittarius |
| 2025 May 12 | 19h 27m 56s | -23° 52’ 44” | 25.48 | Sagittarius |
| 2025 May 13 | 19h 27m 46s | -23° 52’ 21” | 25.48 | Sagittarius |
| 2025 May 14 | 19h 27m 36s | -23° 51’ 58” | 25.47 | Sagittarius |
| 2025 May 15 | 19h 27m 24s | -23° 51’ 38” | 25.46 | Sagittarius |
| 2025 May 16 | 19h 27m 12s | -23° 51’ 19” | 25.45 | Sagittarius |
| 2025 May 17 | 19h 26m 59s | -23° 51’ 01” | 25.45 | Sagittarius |
| 2025 May 18 | 19h 26m 45s | -23° 50’ 44” | 25.44 | Sagittarius |
| 2025 May 19 | 19h 26m 29s | -23° 50’ 29” | 25.43 | Sagittarius |
| 2025 May 20 | 19h 26m 13s | -23° 50’ 14” | 25.42 | Sagittarius |
| 2025 May 21 | 19h 25m 57s | -23° 50’ 01” | 25.42 | Sagittarius |
| 2025 May 22 | 19h 25m 39s | -23° 49’ 48” | 25.41 | Sagittarius |
Additional Resources on TheSkyLive
- Comet 110P/Hartley: Complete reference information on TheSkyLive.com
- Where is Comet 110P/Hartley?: Key information on locating Comet 110P/Hartley in the sky.
- Distance from Earth: Find out how far Comet 110P/Hartley is from Earth right now.
- How Bright is Comet 110P/Hartley?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Comet 110P/Hartley's rise and set times from your location.
- Interactive Sky Map: planetarium-style interactive visualization of Comet 110P/Hartley's position in the sky.
- Live Position Tracker: high precision position tracker with deep space imagery.
- Ephemeris: 15 days Comet 110P/Hartley's computed ephemeris.
- Orbital elements: information about Comet 110P/Hartley orbital parameters.
- Orbit Visualization. 3d interactive visualization showing the orbit of Comet 110P/Hartley with respect to the major Solar System objects.