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Comet 117P/Helin-Roman-Alu 1

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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 Gemini on July, 20 2018
High Precision Live Sky Chart
07h 19m 18s
+27° 34’ 05”
 = 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 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 local timezone Europe/London.

Azimuth: 62.4°
Max altitude: 66.1°
Azimuth: 297.6°

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 MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Jul 13 19.96 07h 12m 28s +27° 42’ 38” Gemini
2018 Jul 14 19.96 07h 13m 27s +27° 41’ 26” Gemini
2018 Jul 15 19.96 07h 14m 26s +27° 40’ 14” Gemini
2018 Jul 16 19.96 07h 15m 24s +27° 39’ 02” Gemini
2018 Jul 17 19.96 07h 16m 23s +27° 37’ 49” Gemini
2018 Jul 18 19.96 07h 17m 21s +27° 36’ 34” Gemini
2018 Jul 19 19.96 07h 18m 20s +27° 35’ 21” Gemini
2018 Jul 20 19.96 07h 19m 18s +27° 34’ 05” Gemini
2018 Jul 21 19.95 07h 20m 17s +27° 32’ 49” Gemini
2018 Jul 22 19.95 07h 21m 15s +27° 31’ 33” Gemini
2018 Jul 23 19.95 07h 22m 14s +27° 30’ 17” Gemini
2018 Jul 24 19.95 07h 23m 12s +27° 29’ 00” Gemini
2018 Jul 25 19.95 07h 24m 11s +27° 27’ 42” Gemini
2018 Jul 26 19.95 07h 25m 09s +27° 26’ 25” Gemini

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.