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🌎 Location: Greenwich, United Kingdom [change]

Comet C/2018 Y1 (Iwamoto)

Comet C/2018 Y1 (Iwamoto) is currently in the constellation of Andromeda. The current Right Ascension of Comet C/2018 Y1 (Iwamoto) is 00h 24m 37s and the Declination is +21° 55’ 59” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current estimated magnitude of Comet C/2018 Y1 (Iwamoto) is 21.55 (JPL).

Summary of key facts about Comet C/2018 Y1 (Iwamoto) [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

00h 24m 37s
+21° 55’ 59”
  • C/2018 Y1 (Iwamoto) is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-East direction at an altitude of 57° above the horizon.
  • Given its current magnitude, C/2018 Y1 (Iwamoto) is visible only through long exposure photography.
  • See also C/2018 Y1 (Iwamoto) rise and set times.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Additional information about Comet C/2018 Y1 (Iwamoto) available on TheSkyLive:

Available Resources

Comet C/2018 Y1 (Iwamoto) Position and Finder Charts

Below we provide Comet C/2018 Y1 (Iwamoto) finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Comet C/2018 Y1 (Iwamoto) in Andromeda on October, 31 2020
Field of view: 50x30 degrees
View fullscreen
Map showing Comet C/2018 Y1 (Iwamoto) in Andromeda on October, 31 2020
Field of view: 10x6 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2018 Y1 (Iwamoto) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2018 Y1 (Iwamoto)
RA: 00h 24m 37s
Dec: +21° 55’ 59”
Deep sky finder chart for Comet C/2018 Y1 (Iwamoto)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2018 Y1 (Iwamoto)?, a page that provides all the information needed to find Comet C/2018 Y1 (Iwamoto) in the sky and additional links to sky charts.

Comet C/2018 Y1 (Iwamoto) Distance from Earth

The distance of Comet C/2018 Y1 (Iwamoto) from Earth is currently 915,090,095 kilometers, equivalent to 6.116999 Astronomical Units. Light takes 50 minutes and 52.4120 seconds to travel from Comet C/2018 Y1 (Iwamoto) and arrive to us.

50 minutes and 52.4120 seconds

The following chart shows the distance of Comet C/2018 Y1 (Iwamoto) from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Distance of Comet C/2018 Y1 (Iwamoto) from Earth between January 2013 and December 2100

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2018 Y1 (Iwamoto) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet C/2018 Y1 (Iwamoto) to Earth

Between January 2013 and December 2100, the closest approach of Comet C/2018 Y1 (Iwamoto) to Earth happens on Wed Feb 13 2019 at a distance of 0.303975 Astronomical Units, or 45,474,008 kilometers:

Wed Feb 13 2019

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Comet C/2018 Y1 (Iwamoto) brightness

The current visual magnitude of Comet C/2018 Y1 (Iwamoto) is 21.55.


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 behavior 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.

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2018 Y1 (Iwamoto), 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/2018 Y1 (Iwamoto) between January 2013 and December 2100

Comet C/2018 Y1 (Iwamoto) rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Comet C/2018 Y1 (Iwamoto) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 68.0°
Max altitude: 60.4°
Azimuth: 292.0°

The rise and set times are defined as the time at which the upper limb of Comet C/2018 Y1 (Iwamoto) touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Comet C/2018 Y1 (Iwamoto) Orbital Elements

The following table lists the orbital elements of Comet C/2018 Y1 (Iwamoto) at epoch 24 February 2019 00:00 UTC (JD: 2458539.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99107491
Orbit inclination i 160.40350479°
Perihelion distance q 1.28699389 AU
192,531,546 km
Aphelion distance Q 287.11215815 AU
42,951,367,597 km
Semi-major axis a 144.19957602 AU
21,571,949,571 km
Orbital period period 1,731.6300 years
632,476.5122 days
Date of perihelion transit Tp 2019-Feb-07 00:43:52
2,458,521.5305 JD
Next perihelion transit 3750-Oct-06 13:01
3,090,998.0426 JD
Argument of perihelion peri 358.05706014°
Longitude of the ascending node node 147.48353671936°
Mean anomaly M 0.010228097454499°
Mean motion n 0.00056919°/day

Visualization of Comet C/2018 Y1 (Iwamoto) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2018 Y1 (Iwamoto) with respect of the Sun and the orbits of the major planets. The position of Comet C/2018 Y1 (Iwamoto) 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/2018 Y1 (Iwamoto)
View Comet C/2018 Y1 (Iwamoto) in the 3D Solar System Simulator

Comet C/2018 Y1 (Iwamoto) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2018 Y1 (Iwamoto) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2018 Y1 (Iwamoto) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Oct 24 00h 29m 57s +22° 44’ 44” 21.49 Andromeda
2020 Oct 25 00h 29m 16s +22° 38’ 32” 21.50 Andromeda
2020 Oct 26 00h 28m 32s +22° 32’ 21” 21.50 Andromeda
2020 Oct 27 00h 27m 51s +22° 26’ 08” 21.51 Andromeda
2020 Oct 28 00h 27m 11s +22° 19’ 54” 21.52 Andromeda
2020 Oct 29 00h 26m 30s +22° 13’ 41” 21.52 Andromeda
2020 Oct 30 00h 25m 50s +22° 07’ 29” 21.53 Andromeda
2020 Oct 31 00h 25m 10s +22° 01’ 17” 21.54 Andromeda
2020 Nov 01 00h 24m 32s +21° 55’ 04” 21.55 Andromeda
2020 Nov 02 00h 23m 53s +21° 48’ 52” 21.56 Andromeda
2020 Nov 03 00h 23m 16s +21° 42’ 41” 21.56 Andromeda
2020 Nov 04 00h 22m 39s +21° 36’ 30” 21.57 Pisces
2020 Nov 05 00h 22m 03s +21° 30’ 20” 21.58 Pisces
2020 Nov 06 00h 21m 27s +21° 24’ 12” 21.59 Pisces