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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 Crater on April, 19 2018
High Precision Live Sky Chart
11h 30m 54s
-12° 31’ 59”
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

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 local timezone Europe/London.

Azimuth: 102.5°
Max altitude: 26.0°
Azimuth: 257.5°

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 MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Apr 12 20.14 11h 34m 27s -12° 56’ 12” Crater
2018 Apr 13 20.14 11h 33m 55s -12° 52’ 45” Crater
2018 Apr 14 20.14 11h 33m 24s -12° 49’ 18” Crater
2018 Apr 15 20.14 11h 32m 52s -12° 45’ 50” Crater
2018 Apr 16 20.14 11h 32m 21s -12° 42’ 21” Crater
2018 Apr 17 20.15 11h 31m 51s -12° 38’ 54” Crater
2018 Apr 18 20.15 11h 31m 22s -12° 35’ 26” Crater
2018 Apr 19 20.15 11h 30m 54s -12° 31’ 59” Crater
2018 Apr 20 20.16 11h 30m 24s -12° 28’ 33” Crater
2018 Apr 21 20.16 11h 29m 57s -12° 25’ 08” Crater
2018 Apr 22 20.16 11h 29m 30s -12° 21’ 43” Crater
2018 Apr 23 20.16 11h 29m 04s -12° 18’ 20” Crater
2018 Apr 24 20.17 11h 28m 38s -12° 14’ 57” Crater
2018 Apr 25 20.17 11h 28m 14s -12° 11’ 36” Crater

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.