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Comet 17P/Holmes

Available Resources

Comet 17P/Holmes Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet 17P/Holmes is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Comet 17P/Holmes in Centaurus on March, 25 2019
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
13h 46m 44s
-33° 45’ 30”

The Observed Magnitude and Coma Diameter values are derived from the Comet Observers Database by averaging the values reported in recent observations (more recent than 4 days), when available. The Estimated Magnitude comes from the JPL Horizons ephemerides service and might be inaccurate given the highly dynamic and unpredictable behvior of comets. When available please refer to the Observed Magnitude value and consider the Estimated 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.

Comet 17P/Holmes Rise and Set Times

Today's Comet 17P/Holmes rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 123.8°
Max altitude: 4.8°
Azimuth: 236.2°

Comet 17P/Holmes Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 17P/Holmes with respect of the Sun and the orbits of the major planets. The position of Comet 17P/Holmes 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 17P/Holmes
View Comet 17P/Holmes in the 3D Solar System Simulator

Comet 17P/Holmes Ephemeris

The following table lists the ephemerides of Comet 17P/Holmes computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 17P/Holmes in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Mar 18 13h 51m 11s -33° 33’ 05” 19.41 Centaurus
2019 Mar 19 13h 50m 39s -33° 35’ 11” 19.40 Centaurus
2019 Mar 20 13h 50m 04s -33° 37’ 09” 19.39 Centaurus
2019 Mar 21 13h 49m 29s -33° 38’ 58” 19.39 Centaurus
2019 Mar 22 13h 48m 55s -33° 40’ 41” 19.38 Centaurus
2019 Mar 23 13h 48m 17s -33° 42’ 15” 19.37 Centaurus
2019 Mar 24 13h 47m 40s -33° 43’ 41” 19.36 Centaurus
2019 Mar 25 13h 47m 02s -33° 44’ 57” 19.35 Centaurus
2019 Mar 26 13h 46m 23s -33° 46’ 06” 19.34 Centaurus
2019 Mar 27 13h 45m 43s -33° 47’ 07” 19.33 Centaurus
2019 Mar 28 13h 45m 02s -33° 47’ 57” 19.32 Centaurus
2019 Mar 29 13h 44m 21s -33° 48’ 41” 19.32 Centaurus
2019 Mar 30 13h 43m 40s -33° 49’ 14” 19.31 Centaurus
2019 Mar 31 13h 42m 57s -33° 49’ 39” 19.30 Centaurus

Distance of Comet 17P/Holmes from Earth

The following chart shows the distance of Comet 17P/Holmes from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 17P/Holmes is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet 17P/Holmes from Earth between January 2013 and December 2100

Light Curve of Comet 17P/Holmes

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet 17P/Holmes, 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.

Predicted magnitude of Comet 17P/Holmes between January 2013 and December 2100

Comet 17P/Holmes Orbital Elements

The following table lists the orbital elements of Comet 17P/Holmes at epoch 16 January 2010 00:00 UTC (JD: 2455213.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.43287584
Orbit inclination i 19.11426464°
Perihelion distance q 2.05337899 AU
307,181,125 km
Aphelion distance Q 5.18799469 AU
776,112,960 km
Semi-major axis a 3.62068684 AU
541,647,043 km
Orbital period period 6.8900 years
2,516.4301 days
Date of perihelion transit Tp 2007-May-05 00:40:56
2,454,225.5284 JD
Next perihelion transit 2014-Mar-25 11:00
2,456,741.9585 JD
Argument of perihelion peri 24.351852593229°
Longitude of the ascending node node 326.85321508915°
Mean anomaly M 141.33902074188°
Mean motion n 0.14305981°/day
Closest approach to Earth* 2048-Aug-20
Distance of closest approach* 1.14829316 AU
171,782,212 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2100-Dec-31, with a sampling interval of 1 day.