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TimezoneEurope/London
Sunrise: 4:55 
Transit: 12:57 
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Comet P/2023 S1

Below the horizon.  Rise: 11:11 | Tran: 18:08 | Set: 1:07
Alt: -26.21°   Az: 345.79°   Direction: North-North-West

Comet P/2023 S1 is in the constellation of Leo, at a distance of 411,803,712.0 kilometers from Earth. The current Right Ascension is 09h 25m 25s and the Declination is +11° 18’ 47” (apparent coordinates). The latest observed magnitude of Comet P/2023 S1 is 17.4 (data provided by COBS).

Finder Charts

Map showing Comet P/2023 S1 in Leo on May, 26 2025. Field of view: 50x30 degrees
View interactive star map
Sky map showing Comet P/2023 S1 in Leo on May, 26 2025. Field of view: 15x9 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Comet P/2023 S1 is right now. Click on the image to see a more detailed fullscreen tracker view.

P/2023 S1
RA: 09h 24m 03s
Dec: +11° 25’ 23”
Deep sky finder chart for Comet P/2023 S1. Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Comet P/2023 S1?, a page that provides all the information needed to find Comet P/2023 S1 in the sky and additional links to sky charts.

Celestial Coordinates

Apparent

09h 25m 25s
+11° 18’ 47”
11h 08m 04s
20h 33m 29s

J2000

09h 24m 03s
+11° 25’ 23”

Additional Information

Leo
17.4
0.7'
n/a
2025-05-20
17.42

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.

Rise and Set Times

Today's rise, transit and set times of Comet P/2023 S1 from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 78.7°
Max altitude: 49.8°
Azimuth: 281.3°
  • P/2023 S1 is below the horizon from Greenwich, UK.
  • Given its current magnitude, P/2023 S1 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.

Distance from Earth

The distance of Comet P/2023 S1 from Earth is currently 411,803,712.0 kilometers, equivalent to 2.7527377901 Astronomical Units. Light takes 22m 53.629s to travel from Comet P/2023 S1 and arrive to us.

411,803,712.0
2.7527377901
22m 53.629s

The following chart shows the distance of Comet P/2023 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.

Chart of the distance of Comet P/2023 S1 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 P/2023 S1 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 2000 and 31 December 2099, the closest approach of Comet P/2023 S1 to Earth happens on Mon Feb 1 2055 at a distance of 1.583669 Astronomical Units, or 236,913,515 kilometers:

Mon Feb 1 2055
236,913,515
1.583669

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

Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet P/2023 S1, 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 P/2023 S1 as a function of time

Orbital Elements

The following table lists the orbital elements of Comet P/2023 S1 at epoch 29 September 2024 00:00 UTC (JD: 2460583.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.31895270
Orbit inclination i 9.15553663°
Perihelion distance q 2.61974098 AU
391,907,673 km
Aphelion distance Q 5.07353083 AU
758,989,410 km
Semi-major axis a 3.84663590 AU
575,448,542 km
Orbital period period 7.5445 years
2,755.6246 days
Date of perihelion transit Tp 2025-Feb-24 00:41:23
2,460,730.5287 JD
Next perihelion transit 2032-Sep-10 15:40
2,463,486.1533 JD
Argument of perihelion peri 180.26407180583°
Longitude of the ascending node node 317.29544876562°
Mean anomaly M 340.79188754367°
Mean motion n 0.13064189°/day
2h1>Orbit Visualization

15 Days Ephemeris

The following table lists the ephemerides of Comet P/2023 S1 computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2025 May 19 09h 16m 46s +12° 09’ 13” 17.33 Cancer
2025 May 20 09h 17m 57s +12° 02’ 23” 17.34 Cancer
2025 May 21 09h 19m 08s +11° 55’ 28” 17.35 Cancer
2025 May 22 09h 20m 20s +11° 48’ 30” 17.37 Cancer
2025 May 23 09h 21m 32s +11° 41’ 28” 17.38 Cancer
2025 May 24 09h 22m 45s +11° 34’ 24” 17.39 Cancer
2025 May 25 09h 23m 59s +11° 27’ 16” 17.41 Leo
2025 May 26 09h 25m 12s +11° 20’ 04” 17.42 Leo
2025 May 27 09h 26m 27s +11° 12’ 49” 17.43 Leo
2025 May 28 09h 27m 42s +11° 05’ 30” 17.44 Leo
2025 May 29 09h 28m 57s +10° 58’ 07” 17.46 Leo
2025 May 30 09h 30m 13s +10° 50’ 42” 17.47 Leo
2025 May 31 09h 31m 28s +10° 43’ 13” 17.48 Leo
2025 Jun 01 09h 32m 45s +10° 35’ 40” 17.49 Leo

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