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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 Corvus on October, 17 2018
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]
12h 47m 01s
-18° 25’ 27”

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: 108.4°
Max altitude: 20.1°
Azimuth: 251.6°

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
2018 Oct 10 12h 40m 33s -17° 38’ 21” 20.67 Corvus
2018 Oct 11 12h 41m 26s -17° 44’ 35” 20.66 Corvus
2018 Oct 12 12h 42m 18s -17° 50’ 52” 20.66 Corvus
2018 Oct 13 12h 43m 09s -17° 57’ 10” 20.66 Corvus
2018 Oct 14 12h 44m 02s -18° 03’ 29” 20.66 Corvus
2018 Oct 15 12h 44m 53s -18° 09’ 50” 20.65 Corvus
2018 Oct 16 12h 45m 46s -18° 16’ 11” 20.65 Corvus
2018 Oct 17 12h 46m 37s -18° 22’ 35” 20.65 Corvus
2018 Oct 18 12h 47m 30s -18° 28’ 59” 20.65 Corvus
2018 Oct 19 12h 48m 21s -18° 35’ 25” 20.64 Corvus
2018 Oct 20 12h 49m 14s -18° 41’ 52” 20.64 Corvus
2018 Oct 21 12h 50m 06s -18° 48’ 20” 20.64 Corvus
2018 Oct 22 12h 50m 57s -18° 54’ 48” 20.63 Corvus
2018 Oct 23 12h 51m 50s -19° 01’ 18” 20.63 Corvus

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 2075

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 2075

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 2075-Dec-31, with a sampling interval of 1 day.