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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 Camelopardalis on October, 19 2017
High Precision Live Sky Chart
04h 45m 48s
+55° 40’ 36”
 = 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 02:54 UTC (altitude: 85.8°)

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 Oct 12 11.02 04h 38m 18s +47° 38’ 32” Perseus
2017 Oct 13 11.02 04h 39m 26s +48° 48’ 09” Perseus
2017 Oct 14 11.01 04h 40m 35s +49° 57’ 37” Perseus
2017 Oct 15 11.01 04h 41m 40s +51° 06’ 55” Perseus
2017 Oct 16 11.01 04h 42m 46s +52° 15’ 56” Perseus
2017 Oct 17 11.01 04h 43m 49s +53° 24’ 35” Camelopardalis
2017 Oct 18 11.01 04h 44m 49s +54° 32’ 50” Camelopardalis
2017 Oct 19 11.01 04h 45m 48s +55° 40’ 36” Camelopardalis
2017 Oct 20 11.02 04h 46m 46s +56° 47’ 47” Camelopardalis
2017 Oct 21 11.03 04h 47m 41s +57° 54’ 19” Camelopardalis
2017 Oct 22 11.04 04h 48m 34s +59° 00’ 08” Camelopardalis
2017 Oct 23 11.05 04h 49m 26s +60° 05’ 12” Camelopardalis
2017 Oct 24 11.06 04h 50m 13s +61° 09’ 24” Camelopardalis
2017 Oct 25 11.08 04h 50m 58s +62° 12’ 42” Camelopardalis

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 13 August 2017 00:00 UTC (JD: 2457979.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99674375
Orbit inclination i 39.84978411°
Perihelion distance q 1.49874777 AU
224,209,476 km
Aphelion distance Q 919.03748140 AU
137,486,050,587 km
Semi-major axis a 460.26811459 AU
68,855,130,031 km
Orbital period period 9,874.7100 years
3,606,739.3798 days
Date of perihelion transit Tp 2017-Oct-14 18:48:04
2,458,041.2834 JD
Next perihelion transit 11892-Sep-14 03:54
6,064,780.6632 JD
Argument of perihelion peri 20.906818988266°
Longitude of the ascending node node 25.811438142382°
Mean anomaly M 359.99383320613°
Mean motion n 0.00009981°/day
Closest approach to Earth* 2017-Oct-18
Distance of closest approach* 0.71982705 AU
107,684,594 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.