Comet 117P/Helin-Roman-Alu 1
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.
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.
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!
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.
|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.
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.
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
|Perihelion distance||q||3.04545979 AU
|Date of perihelion transit||Tp||2014-Mar-27 07:17:41
|Next perihelion transit||2022-Jul-01 23:25
|Argument of perihelion||peri||223.03571782675°|
|Longitude of the ascending node||node||58.925279887096°|
|Closest approach to Earth*||2022-Jul-03|
|Distance of closest approach*||2.03084778 AU
* 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.