Comet 78P/Gehrels
Comet 78P/Gehrels is in the constellation of Capricornus, at a distance of
Finder Charts
The sky charts below show, at different resolutions, the position of comet 78P/Gehrels 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 78P/Gehrels 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 78P/Gehrels from Saint George's, Grenada (all times relative to the local timezone America/Grenada):
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 78P/Gehrels from Earth is currently
The following graph shows the distance of comet 78P/Gehrels 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 78P/Gehrels 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 78P/Gehrels to Earth happened on Tuesday 9 November 2004 at a distance of 1.022782 Astronomical Units, or 153,005,944 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 78P/Gehrels, 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.
Orbital Elements
The following table lists the orbital elements of comet 78P/Gehrels at epoch November, 27 2014 00:00 UTC (JD: 2456989.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 0.46163398 |
| Orbit inclination | i | 6.25268370° |
| Perihelion distance | q | 2.01154908 AU 300,923,459 km |
| Aphelion distance | Q |
5.46124453 AU 816,990,554 km |
| Semi-major axis | a |
3.73639680 AU 558,957,007 km |
| Orbital period | period |
7.2225 years 2,638.0190 days |
| Date of perihelion transit | Tp | January 12, 2012 2,455,938.6002 JD |
| Next perihelion transit | April 3, 2019 2,458,576.6192 JD |
|
| Argument of perihelion | peri | 192.75458609607° |
| Longitude of the ascending node | node | 210.5626478481° |
| Mean anomaly | M | 143.41212896389° |
| Mean motion | n | 0.13646604°/day |
Orbit Visualization
The following chart is a 3D animated visualization of the orbit of comet 78P/Gehrels relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.
15 Days Ephemeris
The following table lists the ephemerides of comet 78P/Gehrels 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 02 2025 | 20h 37m 41s | -09° 28’ 31” | 17.67 | Capricornus |
| Jul 03 2025 | 20h 37m 07s | -09° 28’ 52” | 17.66 | Capricornus |
| Jul 04 2025 | 20h 36m 33s | -09° 29’ 20” | 17.64 | Capricornus |
| Jul 05 2025 | 20h 35m 59s | -09° 29’ 54” | 17.62 | Capricornus |
| Jul 06 2025 | 20h 35m 23s | -09° 30’ 34” | 17.60 | Capricornus |
| Jul 07 2025 | 20h 34m 46s | -09° 31’ 20” | 17.59 | Capricornus |
| Jul 08 2025 | 20h 34m 09s | -09° 32’ 12” | 17.57 | Capricornus |
| Jul 09 2025 | 20h 33m 30s | -09° 33’ 11” | 17.55 | Capricornus |
| Jul 10 2025 | 20h 32m 50s | -09° 34’ 14” | 17.54 | Capricornus |
| Jul 11 2025 | 20h 32m 10s | -09° 35’ 24” | 17.52 | Capricornus |
| Jul 12 2025 | 20h 31m 29s | -09° 36’ 39” | 17.50 | Capricornus |
| Jul 13 2025 | 20h 30m 47s | -09° 38’ 00” | 17.49 | Capricornus |
| Jul 14 2025 | 20h 30m 05s | -09° 39’ 28” | 17.47 | Capricornus |
| Jul 15 2025 | 20h 29m 22s | -09° 41’ 01” | 17.46 | Capricornus |
Additional Resources on TheSkyLive
- Comet 78P/Gehrels: Complete reference information on TheSkyLive.com.
- Where is comet 78P/Gehrels?: Key information on where to find comet 78P/Gehrels in the sky.
- Distance of comet 78P/Gehrels from Earth: Find out how far comet 78P/Gehrels is from Earth right now.
- How Bright is comet 78P/Gehrels?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Rise and set times of comet 78P/Gehrels from your location.
- Interactive Sky Map: Planetarium-style interactive visualization of comet 78P/Gehrels's position in the sky.
- Live Position Tracker: High precision real time tracker of comet 78P/Gehrels's position using deep space imagery.
- Ephemeris: 15 days comet 78P/Gehrels's computed ephemeris.
- Orbital elements: Information about comet 78P/Gehrels orbital parameters.
- Orbit Visualization: 3D interactive visualization showing the orbit of comet 78P/Gehrels with respect to the major Solar System objects.