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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 February, 22 2018
High Precision Live Sky Chart
06h 03m 23s
+77° 08’ 24”
 = 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 19:52 UTC (altitude: 64.3°)

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 Feb 15 17.38 05h 34m 13s +79° 07’ 29” Camelopardalis
2018 Feb 16 17.42 05h 38m 43s +78° 51’ 02” Camelopardalis
2018 Feb 17 17.47 05h 43m 05s +78° 34’ 22” Camelopardalis
2018 Feb 18 17.51 05h 47m 21s +78° 17’ 30” Camelopardalis
2018 Feb 19 17.56 05h 51m 29s +78° 00’ 28” Camelopardalis
2018 Feb 20 17.60 05h 55m 33s +77° 43’ 15” Camelopardalis
2018 Feb 21 17.65 05h 59m 30s +77° 25’ 54” Camelopardalis
2018 Feb 22 17.69 06h 03m 23s +77° 08’ 24” Camelopardalis
2018 Feb 23 17.74 06h 07m 09s +76° 50’ 45” Camelopardalis
2018 Feb 24 17.78 06h 10m 50s +76° 32’ 58” Camelopardalis
2018 Feb 25 17.83 06h 14m 27s +76° 15’ 05” Camelopardalis
2018 Feb 26 17.87 06h 17m 59s +75° 57’ 03” Camelopardalis
2018 Feb 27 17.92 06h 21m 26s +75° 38’ 57” Camelopardalis
2018 Feb 28 17.96 06h 24m 50s +75° 20’ 43” 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 28 September 2017 00:00 UTC (JD: 2458025.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99641689
Orbit inclination i 39.84823235°
Perihelion distance q 1.49868324 AU
224,199,822 km
Aphelion distance Q 835.02828743 AU
124,918,454,024 km
Semi-major axis a 418.26348533 AU
62,571,326,923 km
Orbital period period 8,554.2700 years
3,124,448.3872 days
Date of perihelion transit Tp 2017-Oct-14 18:51:00
2,458,041.2854 JD
Next perihelion transit 10572-Mar-27 04:08
5,582,489.6726 JD
Argument of perihelion peri 20.908042008125°
Longitude of the ascending node node 25.809381655084°
Mean anomaly M 359.99818119793°
Mean motion n 0.00011522°/day
Closest approach to Earth* 2017-Oct-18
Distance of closest approach* 0.71974252 AU
107,671,948 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.