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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 Coma on October, 16 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
12h 12m 12s
+25° 30’ 44”

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 C/2017 O1 (ASASSN1) Rise and Set Times

Today's Comet C/2017 O1 (ASASSN1) rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 64.5°
Max altitude: 64.0°
Azimuth: 295.5°

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 Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Oct 09 12h 05m 56s +26° 07’ 50” 20.91 Coma
2018 Oct 10 12h 06m 47s +26° 02’ 29” 20.92 Coma
2018 Oct 11 12h 07m 41s +25° 57’ 11” 20.93 Coma
2018 Oct 12 12h 08m 33s +25° 52’ 00” 20.93 Coma
2018 Oct 13 12h 09m 24s +25° 46’ 54” 20.94 Coma
2018 Oct 14 12h 10m 15s +25° 41’ 53” 20.95 Coma
2018 Oct 15 12h 11m 08s +25° 36’ 57” 20.96 Coma
2018 Oct 16 12h 11m 57s +25° 32’ 07” 20.96 Coma
2018 Oct 17 12h 12m 48s +25° 27’ 21” 20.97 Coma
2018 Oct 18 12h 13m 38s +25° 22’ 41” 20.98 Coma
2018 Oct 19 12h 14m 27s +25° 18’ 07” 20.98 Coma
2018 Oct 20 12h 15m 18s +25° 13’ 38” 20.99 Coma
2018 Oct 21 12h 16m 06s +25° 09’ 15” 21.00 Coma
2018 Oct 22 12h 16m 54s +25° 04’ 56” 21.00 Coma

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 11 October 2017 00:00 UTC (JD: 2458038.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99642268
Orbit inclination i 39.84838169°
Perihelion distance q 1.49868633 AU
224,200,284 km
Aphelion distance Q 836.38289162 AU
125,121,099,927 km
Semi-major axis a 418.94078897 AU
62,672,650,106 km
Orbital period period 8,575.0600 years
3,132,040.6950 days
Date of perihelion transit Tp 2017-Oct-14 18:50:44
2,458,041.2852 JD
Next perihelion transit 10593-Jan-08 11:31
5,590,081.9802 JD
Argument of perihelion peri 20.90788998889°
Longitude of the ascending node node 25.809469041478°
Mean anomaly M 359.99967986211°
Mean motion n 0.00011494°/day
Closest approach to Earth* 2017-Oct-18
Distance of closest approach* 0.71974600 AU
107,672,470 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.