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Comet 17P/Holmes

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Comet 17P/Holmes Position

Comet 17P/Holmes is currently in the constellation of Hydra. The current Right Ascension is 13h 53m 31s and the Declination is -28° 54’ 27”.

13h 53m 31s
-28° 54’ 27”

Simplified sky chart showing where Comet 17P/Holmes is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Comet 17P/Holmes in Hydra on September, 15 2019
Field of view: 60x30 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Hihgher precision deep sky finder chart showing where Comet 17P/Holmes is right now (view fullscreen)

17P/Holmes
RA: 13h 53m 31s
Dec: -28° 54’ 27”
Deep sky finder chart for Comet 17P/Holmes
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet 17P/Holmes?, a page that provides all the information needed to find Comet 17P/Holmes in the sky and additional links to sky charts.

Comet 17P/Holmes Distance

The distance of Comet 17P/Holmes from Earth is currently 671,685,956 kilometers, equivalent to 4.489943 Astronomical Units. Light takes 37 minutes and 20.5032 seconds to travel from Comet 17P/Holmes and arrive to us.

671,685,956
4.489943
37 minutes and 20.5032 seconds

The following chart shows the distance of Comet 17P/Holmes 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.

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

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 17P/Holmes from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet 17P/Holmes to Earth

Between January 2013 and December 2100 the closest approach of Comet 17P/Holmes to Earth happens on Thu Aug 20 2048 at a distance of 1.14521996 Astronomical Units, or 171,322,468 kilometers:

Thu Aug 20 2048
171,322,468
1.145220

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

Comet 17P/Holmes brightness

The current visual magnitude of Comet 17P/Holmes is 20.98.

20.98
-
-

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.

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 rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Comet 17P/Holmes rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 118.9°
Max altitude: 9.6°
Azimuth: 241.1°
Comet 17P/Holmes is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Comet 17P/Holmes touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet 17P/Holmes Orbital Elements

The following table lists the orbital elements of Comet 17P/Holmes at epoch 02 August 2014 00:00 UTC (JD: 2456872.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.43181344
Orbit inclination i 19.09175525°
Perihelion distance q 2.05661374 AU
307,665,038 km
Aphelion distance Q 5.18260623 AU
775,306,858 km
Semi-major axis a 3.61960999 AU
541,485,948 km
Orbital period period 6.8900 years
2,515.3075 days
Date of perihelion transit Tp 2014-Mar-27 12:18:11
2,456,744.0126 JD
Next perihelion transit 2021-Feb-13 19:41
2,459,259.3202 JD
Argument of perihelion peri 24.515349359396°
Longitude of the ascending node node 326.76479965817°
Mean anomaly M 18.389581859552°
Mean motion n 0.14312365°/day

Visualization of Comet 17P/Holmes Orbit

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 15 Days 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 Sep 08 13h 45m 21s -28° 29’ 40” 21.00 Hydra
2019 Sep 09 13h 46m 24s -28° 32’ 44” 21.00 Hydra
2019 Sep 10 13h 47m 27s -28° 35’ 51” 20.99 Hydra
2019 Sep 11 13h 48m 30s -28° 39’ 01” 20.99 Hydra
2019 Sep 12 13h 49m 36s -28° 42’ 15” 20.99 Hydra
2019 Sep 13 13h 50m 39s -28° 45’ 32” 20.99 Hydra
2019 Sep 14 13h 51m 45s -28° 48’ 51” 20.98 Hydra
2019 Sep 15 13h 52m 50s -28° 52’ 15” 20.98 Hydra
2019 Sep 16 13h 53m 56s -28° 55’ 42” 20.98 Hydra
2019 Sep 17 13h 55m 03s -28° 59’ 12” 20.97 Hydra
2019 Sep 18 13h 56m 09s -29° 02’ 45” 20.97 Hydra
2019 Sep 19 13h 57m 16s -29° 06’ 21” 20.97 Hydra
2019 Sep 20 13h 58m 24s -29° 10’ 01” 20.96 Hydra
2019 Sep 21 13h 59m 32s -29° 13’ 44” 20.96 Hydra