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Comet C/2017 O1 (ASASSN1)

Available Resources

Comet C/2017 O1 (ASASSN1) Sky Charts and Coordinates

This is a simplified sky chart, showing where Comet C/2017 O1 (ASASSN1) 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 C/2017 O1 (ASASSN1) in Ursa Major on June, 19 2018
High Precision Live Sky Chart
09h 59m 27s
+43° 57’ 39”
 = 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 C/2017 O1 (ASASSN1) Rise and Set Times

Comet C/2017 O1 (ASASSN1) is circumpolar from Greenwich, United Kingdom [change] and transits at 16:08 UTC (altitude: 82.5°)

Comet C/2017 O1 (ASASSN1) Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2017 O1 (ASASSN1) with respect of the Sun and the orbits of the major planets. The position of Comet C/2017 O1 (ASASSN1) 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 C/2017 O1 (ASASSN1)
View Comet C/2017 O1 (ASASSN1) in the 3D Solar System Simulator

Comet C/2017 O1 (ASASSN1) Ephemeris

The following table lists the ephemerides of Comet C/2017 O1 (ASASSN1) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2017 O1 (ASASSN1) in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2018 Jun 12 21.63 09h 49m 45s +45° 33’ 09” Ursa Major
2018 Jun 13 21.66 09h 51m 10s +45° 19’ 18” Ursa Major
2018 Jun 14 21.69 09h 52m 33s +45° 05’ 30” Ursa Major
2018 Jun 15 21.72 09h 53m 57s +44° 51’ 47” Ursa Major
2018 Jun 16 21.75 09h 55m 19s +44° 38’ 09” Ursa Major
2018 Jun 17 21.78 09h 56m 43s +44° 24’ 35” Ursa Major
2018 Jun 18 21.81 09h 58m 05s +44° 11’ 06” Ursa Major
2018 Jun 19 21.84 09h 59m 27s +43° 57’ 39” Ursa Major
2018 Jun 20 21.87 10h 00m 50s +43° 44’ 17” Ursa Major
2018 Jun 21 21.90 10h 02m 11s +43° 31’ 00” Ursa Major
2018 Jun 22 21.93 10h 03m 33s +43° 17’ 48” Ursa Major
2018 Jun 23 21.95 10h 04m 54s +43° 04’ 39” Ursa Major
2018 Jun 24 21.98 10h 06m 14s +42° 51’ 33” Ursa Major
2018 Jun 25 22.01 10h 07m 35s +42° 38’ 32” Ursa Major

Distance of Comet C/2017 O1 (ASASSN1) from Earth

The following chart shows the distance of Comet C/2017 O1 (ASASSN1) 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 C/2017 O1 (ASASSN1) is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Comet C/2017 O1 (ASASSN1) from Earth between January 2013 and December 2075

Light Curve of Comet C/2017 O1 (ASASSN1)

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2017 O1 (ASASSN1), 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 C/2017 O1 (ASASSN1) between January 2013 and December 2075

Comet C/2017 O1 (ASASSN1) Orbital Elements

The following table lists the orbital elements of Comet C/2017 O1 (ASASSN1) at epoch 10 October 2017 00:00 UTC (JD: 2458037.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99642071
Orbit inclination i 39.84835716°
Perihelion distance q 1.49868576 AU
224,200,198 km
Aphelion distance Q 835.92218787 AU
125,052,179,627 km
Semi-major axis a 418.71043681 AU
62,638,189,913 km
Orbital period period 8,567.9900 years
3,129,457.8485 days
Date of perihelion transit Tp 2017-Oct-14 18:50:47
2,458,041.2853 JD
Next perihelion transit 10585-Dec-13 15:12
5,587,499.1338 JD
Argument of perihelion peri 20.907914584654°
Longitude of the ascending node node 25.809454390533°
Mean anomaly M 359.99956455782°
Mean motion n 0.00011504°/day
Closest approach to Earth* 2017-Oct-18
Distance of closest approach* 0.71974528 AU
107,672,362 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.