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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Astronomical TwilightWhat's Visible Now?
Comets » 

Comet 27P/Crommelin

Altitude: -16.9°   Azimuth: 96.1°   Direction: East

Comet 27P/Crommelin is currently in the constellation of Ophiucus.

The current Right Ascension of Comet 27P/Crommelin is 17h 27m 14s and the Declination is -16° 53’ 52” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom edit_location_alt). The current estimated magnitude of Comet 27P/Crommelin is 53.93 (JPL).

17h 27m 14s
-16° 53’ 52”

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 27P/Crommelin from Greenwich, United Kingdom edit_location_alt (all times relative to the local timezone Europe/London):

Azimuth: 106.9°
Max altitude: 21.6°
Azimuth: 253.1°
  • 27P/Crommelin is below the horizon from Greenwich, United Kingdom edit_location_alt.
  • 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.

Available Resources

Comet 27P/Crommelin Position and Finder Charts

Below we provide Comet 27P/Crommelin finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Finder chart of 27P/Crommelin in Ophiucus on December,05 2023
Map showing Comet 27P/Crommelin in Ophiucus on December, 05 2023
Field of view: 50x30 degrees
View fullscreen
Finder chart of 27P/Crommelin
Map showing Comet 27P/Crommelin in Ophiucus on December, 05 2023
Field of view: 10x6 degrees
View fullscreen

Higher 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.

RA: 17h 27m 14s
Dec: -16° 53’ 52”
Deep sky finder chart for Comet 27P/Crommelin
Field of view: 60x40 arcmins
View fullscreen

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.

Comet 27P/Crommelin Distance from Earth

The distance of Comet 27P/Crommelin from Earth is currently 2,760,450,847 kilometers, equivalent to 18.452474 Astronomical Units. Light takes 2 hours, 33 minutes and 27.8729 seconds to travel from Comet 27P/Crommelin and arrive to us.

2 hours, 33 minutes and 27.8729 seconds

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 of Comet 27P/Crommelin to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet 27P/Crommelin to Earth happens on Thu Jul 8 2066 at a distance of 1.663966 Astronomical Units, or 248,925,802 kilometers:

Thu Jul 8 2066

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

Comet 27P/Crommelin Brightness and 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

Comet 27P/Crommelin Orbital Elements

The following table lists the orbital elements of Comet 27P/Crommelin at epoch 12 March 2013 00:00 UTC (JD: 2456364.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.91898109
Orbit inclination i 28.96687279°
Perihelion distance q 0.74828747 AU
111,942,212 km
Aphelion distance Q 17.72363442 AU
2,651,417,976 km
Semi-major axis a 9.23596094 AU
1,381,680,094 km
Orbital period period 28.0693 years
10,252.3060 days
Date of perihelion transit Tp 2011-Aug-03 21:23:10
2,455,777.3911 JD
Next perihelion transit 2039-Aug-29 04:43
2,466,029.6971 JD
Argument of perihelion peri 196.02539689138°
Longitude of the ascending node node 250.62640983902°
Mean anomaly M 20.615772516836°
Mean motion n 0.03511405°/day

Visualization of Comet 27P/Crommelin Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 27P/Crommelin with respect of the Sun and the orbits of the major planets. The position of Comet 27P/Crommelin 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 27P/Crommelin
View Comet 27P/Crommelin in the 3D Solar System Simulator

Comet 27P/Crommelin 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. Click on each row of the table to locate Comet 27P/Crommelin in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2023 Nov 28 17h 25m 32s -16° 52’ 39” 53.92 Ophiucus
2023 Nov 29 17h 25m 45s -16° 52’ 50” 53.92 Ophiucus
2023 Nov 30 17h 25m 59s -16° 53’ 00” 53.92 Ophiucus
2023 Dec 01 17h 26m 13s -16° 53’ 11” 53.92 Ophiucus
2023 Dec 02 17h 26m 27s -16° 53’ 21” 53.92 Ophiucus
2023 Dec 03 17h 26m 42s -16° 53’ 30” 53.93 Ophiucus
2023 Dec 04 17h 26m 57s -16° 53’ 40” 53.93 Ophiucus
2023 Dec 05 17h 27m 11s -16° 53’ 49” 53.93 Ophiucus
2023 Dec 06 17h 27m 24s -16° 53’ 57” 53.93 Ophiucus
2023 Dec 07 17h 27m 38s -16° 54’ 06” 53.93 Ophiucus
2023 Dec 08 17h 27m 52s -16° 54’ 14” 53.93 Ophiucus
2023 Dec 09 17h 28m 08s -16° 54’ 21” 53.93 Ophiucus
2023 Dec 10 17h 28m 22s -16° 54’ 29” 53.93 Ophiucus
2023 Dec 11 17h 28m 36s -16° 54’ 34” 53.93 Ophiucus