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Comet 27P/Crommelin

Below the horizon.  Rise: 3:44 | Tran: 8:17 | Set: 12:50
Alt: -53.67°   Az: 17.41°   Direction: North-North-East

Comet 27P/Crommelin is in the constellation of Sagittarius, at a distance of 2,711,237,283.0 kilometers from Earth. The current Right Ascension is 17h 48m 27s and the Declination is -16° 09’ 21” (apparent coordinates). The predicted magnitude of Comet 27P/Crommelin is 53.56 (data provided by JPL Horizons).

Finder Charts

Map showing Comet 27P/Crommelin in Sagittarius on February, 12 2025. Field of view: 50x30 degrees
View interactive star map
Sky map showing Comet 27P/Crommelin in Sagittarius on February, 12 2025. Field of view: 15x9 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Comet 27P/Crommelin is right now. Click on the image to see a more detailed fullscreen tracker view.

27P/Crommelin
RA: 17h 47m 00s
Dec: -16° 08’ 54”
Deep sky finder chart for Comet 27P/Crommelin. Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Comet 27P/Crommelin?, a page that provides all the information needed to find Comet 27P/Crommelin in the sky and additional links to sky charts.

Celestial Coordinates

Apparent

17h 48m 27s
-16° 09’ 21”
12h 42m 32s
06h 31m 00s

J2000

17h 47m 00s
-16° 08’ 54”

Additional Information

Sagittarius
n/a
n/a
n/a
n/a
53.56

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.

Rise and Set Times

Today's rise, transit and set times of Comet 27P/Crommelin from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 106.2°
Max altitude: 22.4°
Azimuth: 253.8°
  • 27P/Crommelin is below the horizon from Greenwich, UK.
  • Given its current magnitude, 27P/Crommelin 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 27P/Crommelin from Earth is currently 2,711,237,283.0 kilometers, equivalent to 18.1235018274 Astronomical Units. Light takes 2h 30m 43.714s to travel from Comet 27P/Crommelin and arrive to us.

2,711,237,283.0
18.1235018274
2h 30m 43.714s

The following chart shows the distance of Comet 27P/Crommelin 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 27P/Crommelin 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 27P/Crommelin 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 27P/Crommelin to Earth happens on Wed Jul 20 2011 at a distance of 1.585955 Astronomical Units, or 237,255,518 kilometers:

Wed Jul 20 2011
237,255,518
1.585955

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 27P/Crommelin, 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 27P/Crommelin as a function of time

Orbital Elements

The following table lists the orbital elements of Comet 27P/Crommelin at epoch 02 August 2002 00:00 UTC (JD: 2452489.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.91925987
Orbit inclination i 29.22111461°
Perihelion distance q 0.73421009 AU
109,836,266 km
Aphelion distance Q 17.45278379 AU
2,610,899,298 km
Semi-major axis a 9.09349694 AU
1,360,367,782 km
Orbital period period 27.4223 years
10,016.0115 days
Date of perihelion transit Tp 2011-Aug-02 13:37:41
2,455,776.0678 JD
Next perihelion transit 2039-Jan-03 13:54
2,465,792.0793 JD
Argument of perihelion peri 195.95544535372°
Longitude of the ascending node node 250.95935274773°
Mean anomaly M 241.87269707634°
Mean motion n 0.03594245°/day

Orbit Visualization

Orbit Diagram of Comet 27P/Crommelin
View Comet 27P/Crommelin in the 3D Solar System Simulator

15 Days Ephemeris

The following table lists the ephemerides of Comet 27P/Crommelin 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 05 17h 47m 15s -16° 12’ 23” 53.58 Sagittarius
2025 Feb 06 17h 47m 25s -16° 12’ 02” 53.57 Sagittarius
2025 Feb 07 17h 47m 35s -16° 11’ 40” 53.57 Sagittarius
2025 Feb 08 17h 47m 44s -16° 11’ 16” 53.57 Sagittarius
2025 Feb 09 17h 47m 53s -16° 10’ 54” 53.57 Sagittarius
2025 Feb 10 17h 48m 02s -16° 10’ 30” 53.57 Sagittarius
2025 Feb 11 17h 48m 11s -16° 10’ 06” 53.57 Sagittarius
2025 Feb 12 17h 48m 20s -16° 09’ 42” 53.56 Sagittarius
2025 Feb 13 17h 48m 28s -16° 09’ 18” 53.56 Sagittarius
2025 Feb 14 17h 48m 37s -16° 08’ 52” 53.56 Sagittarius
2025 Feb 15 17h 48m 45s -16° 08’ 27” 53.56 Sagittarius
2025 Feb 16 17h 48m 53s -16° 08’ 02” 53.56 Sagittarius
2025 Feb 17 17h 49m 00s -16° 07’ 35” 53.56 Sagittarius
2025 Feb 18 17h 49m 08s -16° 07’ 09” 53.55 Sagittarius

Additional Resources