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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 Cepheus on December, 13 2017
High Precision Live Sky Chart
00h 02m 30s
+86° 35’ 49”
 = 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 18:31 UTC (altitude: 54.9°)

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
2017 Dec 06 13.91 01h 24m 51s +86° 43’ 00” Cepheus
2017 Dec 07 13.95 01h 10m 00s +86° 44’ 45” Cepheus
2017 Dec 08 13.99 00h 55m 57s +86° 45’ 20” Cepheus
2017 Dec 09 14.04 00h 42m 52s +86° 44’ 52” Cepheus
2017 Dec 10 14.08 00h 30m 57s +86° 43’ 31” Cepheus
2017 Dec 11 14.12 00h 20m 15s +86° 41’ 27” Cepheus
2017 Dec 12 14.16 00h 10m 46s +86° 38’ 50” Cepheus
2017 Dec 13 14.21 00h 02m 30s +86° 35’ 49” Cepheus
2017 Dec 14 14.25 23h 55m 27s +86° 32’ 30” Cepheus
2017 Dec 15 14.29 23h 49m 29s +86° 28’ 59” Cepheus
2017 Dec 16 14.34 23h 44m 38s +86° 25’ 23” Cepheus
2017 Dec 17 14.38 23h 40m 45s +86° 21’ 43” Cepheus
2017 Dec 18 14.42 23h 37m 49s +86° 18’ 06” Cepheus
2017 Dec 19 14.47 23h 35m 44s +86° 14’ 31” Cepheus

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 07 September 2017 00:00 UTC (JD: 2458004.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99645494
Orbit inclination i 39.84845164°
Perihelion distance q 1.49868885 AU
224,200,661 km
Aphelion distance Q 844.00964993 AU
126,262,046,733 km
Semi-major axis a 422.75416939 AU
63,243,123,697 km
Orbital period period 8,692.4100 years
3,174,901.6468 days
Date of perihelion transit Tp 2017-Oct-14 18:51:12
2,458,041.2856 JD
Next perihelion transit 10710-May-17 10:22
5,632,942.9324 JD
Argument of perihelion peri 20.908204462563°
Longitude of the ascending node node 25.80957399475°
Mean anomaly M 359.99582890909°
Mean motion n 0.00011339°/day
Closest approach to Earth* 2017-Oct-18
Distance of closest approach* 0.71975009 AU
107,673,081 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.