We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
Help keep this site free and ads-free: donate now!
public LocationGreenwich, United Kingdom
Sunrise: 4:53 
Transit: 12:55 
Sunset: 20:59
wb_twilight   (Civil Twilight)   What's Visible Now?

Comet 109P/Swift-Tuttle

Altitude: 11.1°   Azimuth: 219.2°   Direction: South-West

Comet 109P/Swift-Tuttle is currently in the constellation of Hydra, at a distance of 6,244,479,130 kilometers from Earth. This image accurately depicts the Moon's current appearance, highlighting the key features near its terminator:

Finder chart of 109P/Swift-Tuttle in Hydra on May,27 2024
Map showing Comet 109P/Swift-Tuttle in Hydra on May, 27 2024. Field of view: 50x30 degrees
View interactive star map
The current Right Ascension of Comet 109P/Swift-Tuttle is 09h 34m 36s and the Declination is -18° 52’ 56” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom). The current estimated magnitude of Comet 109P/Swift-Tuttle is 36.91 (JPL).

09h 34m 36s
-18° 52’ 56”

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.

Today's rise, transit and set times of Comet 109P/Swift-Tuttle from Greenwich, United Kingdom (all times relative to the local timezone Europe/London):

Azimuth: 108.9°
Max altitude: 19.6°
Azimuth: 251.1°
  • 109P/Swift-Tuttle is above the horizon from Greenwich, United Kingdom.
  • Right now it is placed in the South-West direction at an altitude of 11° above the horizon.
  • Given its current magnitude, 109P/Swift-Tuttle 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.

Additional Resources

Comet 109P/Swift-Tuttle Position and Finder Charts

Finder chart of 109P/Swift-Tuttle
Map showing Comet 109P/Swift-Tuttle in Hydra on May, 27 2024
Field of view: 10x6 degrees
View fullscreen

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet 109P/Swift-Tuttle is right now. Click on the image to see a more detailed fullscreen tracker view.

RA: 09h 34m 36s
Dec: -18° 52’ 56”
Deep sky finder chart for Comet 109P/Swift-Tuttle
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 109P/Swift-Tuttle?, a page that provides all the information needed to find Comet 109P/Swift-Tuttle in the sky and additional links to sky charts.

Comet 109P/Swift-Tuttle Distance from Earth

The distance of Comet 109P/Swift-Tuttle from Earth is currently 6,244,479,130 kilometers, equivalent to 41.741765 Astronomical Units. Light takes 5 hours, 47 minutes and 9.3403 seconds to travel from Comet 109P/Swift-Tuttle and arrive to us.

5 hours, 47 minutes and 9.3403 seconds

The following chart shows the distance of Comet 109P/Swift-Tuttle 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 109P/Swift-Tuttle 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 109P/Swift-Tuttle from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Comet 109P/Swift-Tuttle to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet 109P/Swift-Tuttle to Earth happens on Sun Feb 17 2013 at a distance of 32.765243 Astronomical Units, or 4,901,610,600 kilometers:

Sun Feb 17 2013

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

Comet 109P/Swift-Tuttle Brightness and Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet 109P/Swift-Tuttle, 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 109P/Swift-Tuttle as a function of time

Comet 109P/Swift-Tuttle Orbital Elements

The following table lists the orbital elements of Comet 109P/Swift-Tuttle at epoch 09 October 1995 00:00 UTC (JD: 2450000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.96322576
Orbit inclination i 113.45381700°
Perihelion distance q 0.95951616 AU
143,541,574 km
Aphelion distance Q 51.22462284 AU
7,663,094,520 km
Semi-major axis a 26.09206950 AU
3,903,318,047 km
Orbital period period 133.2818 years
48,681.1935 days
Date of perihelion transit Tp 1992-Dec-11 23:59:41
2,448,968.4998 JD
Next perihelion transit 2126-Mar-26 04:38
2,497,649.6932 JD
Argument of perihelion peri 152.98216763059°
Longitude of the ascending node node 139.38119208159°
Mean anomaly M 7.6316961671242°
Mean motion n 0.00739505°/day

Visualization of Comet 109P/Swift-Tuttle Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 109P/Swift-Tuttle with respect of the Sun and the orbits of the major planets. The position of Comet 109P/Swift-Tuttle and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Comet 109P/Swift-Tuttle
View Comet 109P/Swift-Tuttle in the 3D Solar System Simulator

Comet 109P/Swift-Tuttle 15 Days Ephemeris

The following table lists the ephemerides of Comet 109P/Swift-Tuttle computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 109P/Swift-Tuttle in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2024 May 20 09h 34m 28s -18° 58’ 38” 36.90 Hydra
2024 May 21 09h 34m 28s -18° 57’ 52” 36.90 Hydra
2024 May 22 09h 34m 29s -18° 57’ 07” 36.90 Hydra
2024 May 23 09h 34m 31s -18° 56’ 22” 36.90 Hydra
2024 May 24 09h 34m 32s -18° 55’ 38” 36.90 Hydra
2024 May 25 09h 34m 32s -18° 54’ 56” 36.90 Hydra
2024 May 26 09h 34m 33s -18° 54’ 12” 36.90 Hydra
2024 May 27 09h 34m 36s -18° 53’ 30” 36.90 Hydra
2024 May 28 09h 34m 36s -18° 52’ 49” 36.91 Hydra
2024 May 29 09h 34m 39s -18° 52’ 08” 36.91 Hydra
2024 May 30 09h 34m 40s -18° 51’ 27” 36.91 Hydra
2024 May 31 09h 34m 41s -18° 50’ 48” 36.91 Hydra
2024 Jun 01 09h 34m 44s -18° 50’ 08” 36.91 Hydra
2024 Jun 02 09h 34m 45s -18° 49’ 29” 36.91 Hydra