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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
wb_twilight Nautical TwilightWhat's Visible Now
Comets » 

Comet C/2020 S3 (Erasmus)

Altitude: 14.4°   Azimuth: 82.4°   Direction: East

Comet C/2020 S3 (Erasmus) is currently in the constellation of Pisces. The current Right Ascension of Comet C/2020 S3 (Erasmus) is 00h 45m 33s and the Declination is +15° 56’ 37” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom edit_location_alt). The current estimated magnitude of Comet C/2020 S3 (Erasmus) is 22.54 (JPL).

00h 45m 33s
+15° 56’ 37”

The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted 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.

Today's rise, transit and set times of Comet C/2020 S3 (Erasmus) from Greenwich, United Kingdom edit_location_alt (all times relative to the local timezone Europe/London):

Azimuth: 74.1°
Max altitude: 54.5°
Azimuth: 286.0°
  • C/2020 S3 (Erasmus) is above the horizon from Greenwich, United Kingdom edit_location_alt.
  • Right now it is placed in the East direction at an altitude of 14° above the horizon.
  • Given its current magnitude, C/2020 S3 (Erasmus) is visible only through long exposure photography.
  • 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.

Available Resources

Comet C/2020 S3 (Erasmus) Position and Finder Charts

Below we provide Comet C/2020 S3 (Erasmus) 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.

Finder chart of C/2020 S3 (Erasmus) in Pisces on June,08 2023
Map showing Comet C/2020 S3 (Erasmus) in Pisces on June, 08 2023
Field of view: 50x30 degrees
View fullscreen
Finder chart of C/2020 S3 (Erasmus)
Map showing Comet C/2020 S3 (Erasmus) in Pisces on June, 08 2023
Field of view: 10x6 degrees
View fullscreen

Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2020 S3 (Erasmus) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2020 S3 (Erasmus)
RA: 00h 45m 33s
Dec: +15° 56’ 37”
Deep sky finder chart for Comet C/2020 S3 (Erasmus)
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Comet C/2020 S3 (Erasmus)?, a page that provides all the information needed to find Comet C/2020 S3 (Erasmus) in the sky and additional links to sky charts.

Comet C/2020 S3 (Erasmus) Distance from Earth

The distance of Comet C/2020 S3 (Erasmus) from Earth is currently 1,544,711,095 kilometers, equivalent to 10.325756 Astronomical Units. Light takes 1 hours, 25 minutes and 52.6016 seconds to travel from Comet C/2020 S3 (Erasmus) and arrive to us.

1 hours, 25 minutes and 52.6016 seconds

The following chart shows the distance of Comet C/2020 S3 (Erasmus) 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.

Chart of the distance of Comet C/2020 S3 (Erasmus) from Earth in Astronomical Units (au)

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/2020 S3 (Erasmus) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Comet C/2020 S3 (Erasmus) to Earth

Between 1 January 2013 and 30 December 2100, the closest approach of Comet C/2020 S3 (Erasmus) to Earth happens on Thu Nov 19 2020 at a distance of 1.037747 Astronomical Units, or 155,244,800 kilometers:

Thu Nov 19 2020

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

Comet C/2020 S3 (Erasmus) Brightness and Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2020 S3 (Erasmus), 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.

Chart of the magnitude of Comet C/2020 S3 (Erasmus) as a function of time

Comet C/2020 S3 (Erasmus) Orbital Elements

The following table lists the orbital elements of Comet C/2020 S3 (Erasmus) at epoch 07 March 2021 00:00 UTC (JD: 2459281.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99795507
Orbit inclination i 19.86140734°
Perihelion distance q 0.39847184 AU
59,610,539 km
Aphelion distance Q 389.31742969 AU
58,241,058,624 km
Semi-major axis a 194.85795076 AU
29,150,334,582 km
Orbital period period 2,720.1033 years
993,517.7334 days
Date of perihelion transit Tp 2020-Dec-12 16:07:40
2,459,196.1720 JD
Next perihelion transit 4741-Feb-09 09:43
3,452,713.9054 JD
Argument of perihelion peri 349.88556146963°
Longitude of the ascending node node 222.99291398703°
Mean anomaly M 0.0309185016691°
Mean motion n 0.00036235°/day

Visualization of Comet C/2020 S3 (Erasmus) Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2020 S3 (Erasmus) with respect of the Sun and the orbits of the major planets. The position of Comet C/2020 S3 (Erasmus) 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/2020 S3 (Erasmus)
View Comet C/2020 S3 (Erasmus) in the 3D Solar System Simulator

Comet C/2020 S3 (Erasmus) 15 Days Ephemeris

The following table lists the ephemerides of Comet C/2020 S3 (Erasmus) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2020 S3 (Erasmus) in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2023 Jun 01 00h 44m 09s +15° 42’ 38” 22.54 Pisces
2023 Jun 02 00h 44m 21s +15° 44’ 40” 22.54 Pisces
2023 Jun 03 00h 44m 35s +15° 46’ 41” 22.54 Pisces
2023 Jun 04 00h 44m 47s +15° 48’ 42” 22.54 Pisces
2023 Jun 05 00h 44m 58s +15° 50’ 40” 22.54 Pisces
2023 Jun 06 00h 45m 10s +15° 52’ 37” 22.54 Pisces
2023 Jun 07 00h 45m 21s +15° 54’ 34” 22.54 Pisces
2023 Jun 08 00h 45m 33s +15° 56’ 29” 22.54 Pisces
2023 Jun 09 00h 45m 42s +15° 58’ 23” 22.54 Pisces
2023 Jun 10 00h 45m 54s +16° 00’ 15” 22.54 Pisces
2023 Jun 11 00h 46m 02s +16° 02’ 06” 22.54 Pisces
2023 Jun 12 00h 46m 13s +16° 03’ 55” 22.54 Pisces
2023 Jun 13 00h 46m 23s +16° 05’ 43” 22.54 Pisces
2023 Jun 14 00h 46m 32s +16° 07’ 28” 22.54 Pisces