Find it in the Sky
Chose a date & time and view the position of comet 103P/Hartley in the sky on our interactive planetarium.
In Evidence
Comet 103P/Hartley
Comet 103P/Hartley is in the constellation of Virgo, at a distance of
Finder Charts
The sky charts below show, at different resolutions, the position of comet 103P/Hartley in the sky. Click on each chart to access the interactive star map tool.
The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet 103P/Hartley against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.
Equatorial 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
The following table lists today's rise, transit and set times of comet 103P/Hartley from Greenwich, UK (all times relative to the local timezone Europe/London):
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 103P/Hartley from Earth is currently
The following graph shows the distance of comet 103P/Hartley from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.
Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).
The value of the distance of 103P/Hartley from Earth is also available as a real time updated value in the live position tracker.
Closest Approach to Earth
In the period between January 1, 2000 and December 31, 2099, the closest approach of comet 103P/Hartley to Earth happened on Thursday 21 October 2010 at a distance of 0.120883 Astronomical Units, or 18,083,776 kilometers:
Note: the values for the closest approach are computed with a sampling interval of 1 day.
Light Curve
The following chart shows the light curve of comet 103P/Hartley, i.e., its apparent magnitude as a function of time. The curve is calculated using the latest ephemerides provided by JPL Horizons. The magnitude data is sampled with the interval of 2 days. Because of this sampling, inaccuracies may occur for objects that have large variations of brightness over a few days. For comets, large discrepancies can arise between the calculated brightness and the observations due to their highly dynamic, and not always precisely predictable, behavior.
15 Days Ephemeris
The following table lists the ephemerides of comet 103P/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 |
|---|---|---|---|---|
| Jul 10 2025 | 12h 17m 37s | -07° 20’ 06” | 22.55 | Virgo |
| Jul 11 2025 | 12h 18m 01s | -07° 20’ 56” | 22.56 | Virgo |
| Jul 12 2025 | 12h 18m 26s | -07° 21’ 51” | 22.57 | Virgo |
| Jul 13 2025 | 12h 18m 51s | -07° 22’ 50” | 22.58 | Virgo |
| Jul 14 2025 | 12h 19m 17s | -07° 23’ 53” | 22.59 | Virgo |
| Jul 15 2025 | 12h 19m 43s | -07° 25’ 00” | 22.60 | Virgo |
| Jul 16 2025 | 12h 20m 09s | -07° 26’ 11” | 22.61 | Virgo |
| Jul 17 2025 | 12h 20m 36s | -07° 27’ 26” | 22.62 | Virgo |
| Jul 18 2025 | 12h 21m 04s | -07° 28’ 45” | 22.62 | Virgo |
| Jul 19 2025 | 12h 21m 32s | -07° 30’ 07” | 22.63 | Virgo |
| Jul 20 2025 | 12h 22m 00s | -07° 31’ 34” | 22.64 | Virgo |
| Jul 21 2025 | 12h 22m 29s | -07° 33’ 04” | 22.65 | Virgo |
| Jul 22 2025 | 12h 22m 58s | -07° 34’ 38” | 22.66 | Virgo |
| Jul 23 2025 | 12h 23m 28s | -07° 36’ 16” | 22.67 | Virgo |
Additional Resources on TheSkyLive
- Comet 103P/Hartley: Complete reference information on TheSkyLive.com.
- Where is comet 103P/Hartley?: Key information on where to find comet 103P/Hartley in the sky.
- Distance of comet 103P/Hartley from Earth: Find out how far comet 103P/Hartley is from Earth right now.
- How Bright is comet 103P/Hartley?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Rise and set times of comet 103P/Hartley from your location.
- Interactive Sky Map: Planetarium-style interactive visualization of comet 103P/Hartley's position in the sky.
- Live Position Tracker: High precision real time tracker of comet 103P/Hartley's position using deep space imagery.
- Ephemeris: 15 days comet 103P/Hartley's computed ephemeris.