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Comet Ikeya-Seki (C/1965 S1)

Comet Ikeya-Seki (C/1965 S1) is currently in the constellation of Canis Majoris. The current Right Ascension of Comet Ikeya-Seki (C/1965 S1) is 06h 44m 11s and the Declination is -11° 40’ 33” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]).

Summary of key facts about Comet Ikeya-Seki (C/1965 S1) [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]:

06h 44m 11s
-11° 40’ 33”
Canis Majoris

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Additional information about Comet Ikeya-Seki (C/1965 S1) available on TheSkyLive:

Available Resources

Comet Ikeya-Seki (C/1965 S1) Position and Finder Charts

Below we provide Comet Ikeya-Seki (C/1965 S1) 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 Ikeya-Seki (C/1965 S1) in Canis Majoris on May, 12 2021
Field of view: 50x30 degrees
View fullscreen
Map showing Comet Ikeya-Seki (C/1965 S1) in Canis Majoris on May, 12 2021
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 Ikeya-Seki (C/1965 S1) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/1965 S1 (Ikeya-Seki)
RA: 06h 44m 11s
Dec: -11° 40’ 33”
Deep sky finder chart for Comet Ikeya-Seki (C/1965 S1)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet Ikeya-Seki (C/1965 S1)?, a page that provides all the information needed to find Comet Ikeya-Seki (C/1965 S1) in the sky and additional links to sky charts.

Comet Ikeya-Seki (C/1965 S1) Distance from Earth

The distance of Comet Ikeya-Seki (C/1965 S1) from Earth is currently 11,104,316,951 kilometers, equivalent to 74.227774 Astronomical Units. Light takes 10 hours, 17 minutes and 20.0144 seconds to travel from Comet Ikeya-Seki (C/1965 S1) and arrive to us.

10 hours, 17 minutes and 20.0144 seconds

The following chart shows the distance of Comet Ikeya-Seki (C/1965 S1) 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 Ikeya-Seki (C/1965 S1) from Earth between January 1900 and January 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/1965 S1 (Ikeya-Seki) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Comet Ikeya-Seki (C/1965 S1) to Earth

Between January 1900 and January 2100, the closest approach of Comet Ikeya-Seki (C/1965 S1) to Earth happens on Sun Oct 17 1965 at a distance of 0.906593 Astronomical Units, or 135,624,420 kilometers:

Sun Oct 17 1965

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

Comet Ikeya-Seki (C/1965 S1) brightness

The current visual magnitude of Comet Ikeya-Seki (C/1965 S1) is -100.00.


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.

Comet Ikeya-Seki (C/1965 S1) 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 Ikeya-Seki (C/1965 S1) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 101.7°
Max altitude: 26.8°
Azimuth: 258.3°

The rise and set times are defined as the time at which the upper limb of Comet Ikeya-Seki (C/1965 S1) 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 Ikeya-Seki (C/1965 S1) Orbital Elements

The following table lists the orbital elements of Comet Ikeya-Seki (C/1965 S1) at epoch 01 January 1970 00:00 UTC (JD: 2439040.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99991500
Orbit inclination i 141.86420000°
Perihelion distance q 0.00778600 AU
1,164,769 km
Aphelion distance Q 183.19221400 AU
27,405,165,198 km
Semi-major axis a 91.60000000 AU
13,703,164,984 km
Orbital period period 880.0000 years
321,420.0000 days
Date of perihelion transit Tp 1965-Oct-21 04:24:31
2,439,054.6837 JD
Next perihelion transit 2845-Oct-27 04:24
2,760,474.6837 JD
Argument of perihelion peri 69.0486°
Longitude of the ascending node node 346.9947°
Mean anomaly M -0.015946°
Mean motion n 0.00112420°/day

Visualization of Comet Ikeya-Seki (C/1965 S1) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet Ikeya-Seki (C/1965 S1) with respect of the Sun and the orbits of the major planets. The position of Comet Ikeya-Seki (C/1965 S1) 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 Ikeya-Seki (C/1965 S1)
View Comet Ikeya-Seki (C/1965 S1) in the 3D Solar System Simulator

Comet Ikeya-Seki (C/1965 S1) 15 Days Ephemeris

The following table lists the ephemerides of Comet Ikeya-Seki (C/1965 S1) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet Ikeya-Seki (C/1965 S1) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2021 May 05 06h 43m 56s -11° 43’ 02” N.A. Canis Majoris
2021 May 06 06h 43m 59s -11° 42’ 42” N.A. Canis Majoris
2021 May 07 06h 44m 00s -11° 42’ 21” N.A. Canis Majoris
2021 May 08 06h 44m 02s -11° 42’ 01” N.A. Canis Majoris
2021 May 09 06h 44m 03s -11° 41’ 42” N.A. Canis Majoris
2021 May 10 06h 44m 06s -11° 41’ 21” N.A. Canis Majoris
2021 May 11 06h 44m 08s -11° 41’ 03” N.A. Canis Majoris
2021 May 12 06h 44m 09s -11° 40’ 44” N.A. Canis Majoris
2021 May 13 06h 44m 12s -11° 40’ 26” N.A. Canis Majoris
2021 May 14 06h 44m 14s -11° 40’ 08” N.A. Canis Majoris
2021 May 15 06h 44m 17s -11° 39’ 50” N.A. Canis Majoris
2021 May 16 06h 44m 18s -11° 39’ 33” N.A. Canis Majoris
2021 May 17 06h 44m 21s -11° 39’ 15” N.A. Canis Majoris
2021 May 18 06h 44m 24s -11° 38’ 58” N.A. Canis Majoris