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Comet 117P/Helin-Roman-Alu 1

Available Resources

Comet 117P/Helin-Roman-Alu 1 Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet 117P/Helin-Roman-Alu 1 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 117P/Helin-Roman-Alu 1 in Cancer 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]
08h 30m 11s
+26° 05’ 00”

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 117P/Helin-Roman-Alu 1 Rise and Set Times

Today's Comet 117P/Helin-Roman-Alu 1 rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 63.9°
Max altitude: 64.6°
Azimuth: 296.1°

Comet 117P/Helin-Roman-Alu 1 Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet 117P/Helin-Roman-Alu 1 with respect of the Sun and the orbits of the major planets. The position of Comet 117P/Helin-Roman-Alu 1 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 117P/Helin-Roman-Alu 1
View Comet 117P/Helin-Roman-Alu 1 in the 3D Solar System Simulator

Comet 117P/Helin-Roman-Alu 1 Ephemeris

The following table lists the ephemerides of Comet 117P/Helin-Roman-Alu 1 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet 117P/Helin-Roman-Alu 1 in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Oct 10 08h 26m 34s +26° 05’ 26” 19.61 Cancer
2018 Oct 11 08h 27m 06s +26° 05’ 13” 19.61 Cancer
2018 Oct 12 08h 27m 38s +26° 05’ 04” 19.60 Cancer
2018 Oct 13 08h 28m 09s +26° 04’ 59” 19.59 Cancer
2018 Oct 14 08h 28m 40s +26° 04’ 54” 19.59 Cancer
2018 Oct 15 08h 29m 09s +26° 04’ 54” 19.58 Cancer
2018 Oct 16 08h 29m 39s +26° 04’ 55” 19.57 Cancer
2018 Oct 17 08h 30m 08s +26° 04’ 59” 19.56 Cancer
2018 Oct 18 08h 30m 37s +26° 05’ 07” 19.56 Cancer
2018 Oct 19 08h 31m 04s +26° 05’ 17” 19.55 Cancer
2018 Oct 20 08h 31m 31s +26° 05’ 30” 19.54 Cancer
2018 Oct 21 08h 31m 57s +26° 05’ 44” 19.53 Cancer
2018 Oct 22 08h 32m 21s +26° 06’ 03” 19.53 Cancer
2018 Oct 23 08h 32m 47s +26° 06’ 24” 19.52 Cancer

Distance of Comet 117P/Helin-Roman-Alu 1 from Earth

The following chart shows the distance of Comet 117P/Helin-Roman-Alu 1 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 117P/Helin-Roman-Alu 1 is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet 117P/Helin-Roman-Alu 1 from Earth between January 2013 and December 2075

Light Curve of Comet 117P/Helin-Roman-Alu 1

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet 117P/Helin-Roman-Alu 1, 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 117P/Helin-Roman-Alu 1 between January 2013 and December 2075

Comet 117P/Helin-Roman-Alu 1 Orbital Elements

The following table lists the orbital elements of Comet 117P/Helin-Roman-Alu 1 at epoch 12 December 2009 00:00 UTC (JD: 2455178.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.25513525
Orbit inclination i 8.70160969°
Perihelion distance q 3.04437297 AU
455,431,715 km
Aphelion distance Q 5.12992438 AU
767,425,766 km
Semi-major axis a 4.08714867 AU
611,428,740 km
Orbital period period 8.2600 years
3,018.0684 days
Date of perihelion transit Tp 2005-Dec-20 20:06:50
2,453,725.3381 JD
Next perihelion transit 2014-Mar-26 21:45
2,456,743.4065 JD
Argument of perihelion peri 223.02422021505°
Longitude of the ascending node node 58.929684893562°
Mean anomaly M 173.33546425178°
Mean motion n 0.11928159°/day
Closest approach to Earth* 2022-Jul-03
Distance of closest approach* 2.03085644 AU
303,811,799 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.