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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 December, 15 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 35m 00s
+27° 41’ 23”

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: 62.3°
Max altitude: 66.2°
Azimuth: 297.7°

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 Dec 08 08h 37m 10s +27° 20’ 30” 19.18 Cancer
2018 Dec 09 08h 36m 56s +27° 23’ 17” 19.17 Cancer
2018 Dec 10 08h 36m 39s +27° 26’ 05” 19.16 Cancer
2018 Dec 11 08h 36m 23s +27° 28’ 57” 19.16 Cancer
2018 Dec 12 08h 36m 05s +27° 31’ 50” 19.15 Cancer
2018 Dec 13 08h 35m 45s +27° 34’ 45” 19.15 Cancer
2018 Dec 14 08h 35m 26s +27° 37’ 41” 19.14 Cancer
2018 Dec 15 08h 35m 06s +27° 40’ 40” 19.13 Cancer
2018 Dec 16 08h 34m 45s +27° 43’ 40” 19.13 Cancer
2018 Dec 17 08h 34m 23s +27° 46’ 41” 19.12 Cancer
2018 Dec 18 08h 34m 00s +27° 49’ 44” 19.11 Cancer
2018 Dec 19 08h 33m 36s +27° 52’ 47” 19.11 Cancer
2018 Dec 20 08h 33m 11s +27° 55’ 53” 19.10 Cancer
2018 Dec 21 08h 32m 45s +27° 58’ 59” 19.10 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 16 March 2010 00:00 UTC (JD: 2455272.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.25496872
Orbit inclination i 8.70088925°
Perihelion distance q 3.04545979 AU
455,594,301 km
Aphelion distance Q 5.12992792 AU
767,426,295 km
Semi-major axis a 4.08769386 AU
611,510,298 km
Orbital period period 8.2600 years
3,018.6723 days
Date of perihelion transit Tp 2014-Mar-27 07:17:41
2,456,743.8040 JD
Next perihelion transit 2022-Jul-01 23:25
2,459,762.4763 JD
Argument of perihelion peri 223.03571782675°
Longitude of the ascending node node 58.925279887096°
Mean anomaly M 184.53563306629°
Mean motion n 0.11925773°/day
Closest approach to Earth* 2022-Jul-03
Distance of closest approach* 2.03084778 AU
303,810,504 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.