Comet C/2021 T4 (Lemmon)
Comet C/2021 T4 (Lemmon) is currently in the constellation of Coma, at a distance of 462,986,711 kilometers from Earth.
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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/2021 T4 (Lemmon) from Greenwich, United Kingdom (all times relative to the local timezone Europe/London):
- C/2021 T4 (Lemmon) is above the horizon from Greenwich, United Kingdom.
- Right now it is placed in the East direction at an altitude of 23° above the horizon.
- Given its current magnitude, C/2021 T4 (Lemmon) is visible only through long exposure photography.
- Go to interactive sky chart
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Comet C/2021 T4 (Lemmon) Position and Finder Charts
Field of view: 10x6 degrees
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Higher precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2021 T4 (Lemmon) is right now. Click on the image to see a more detailed fullscreen tracker view.
Also check out Where is Comet C/2021 T4 (Lemmon)?, a page that provides all the information needed to find Comet C/2021 T4 (Lemmon) in the sky and additional links to sky charts.
Comet C/2021 T4 (Lemmon) Distance from Earth
The distance of Comet C/2021 T4 (Lemmon) from Earth is currently 462,986,711 kilometers, equivalent to 3.094875 Astronomical Units. Light takes 25 minutes and 44.3574 seconds to travel from Comet C/2021 T4 (Lemmon) and arrive to us.
The following chart shows the distance of Comet C/2021 T4 (Lemmon) 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.
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/2021 T4 (Lemmon) from Earth is also available as a real time updated value in the Live Position and Data Tracker.
Closest Approach of Comet C/2021 T4 (Lemmon) to Earth
Between 1 January 2000 and 31 December 2099, the closest approach of Comet C/2021 T4 (Lemmon) to Earth happens on Fri Jul 21 2023 at a distance of 0.541534 Astronomical Units, or 81,012,307 kilometers:
NOTE: values for the closest approach are computed with a sampling interval of 1 day.
Comet C/2021 T4 (Lemmon) Brightness and Light Curve
The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2021 T4 (Lemmon), 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.
Comet C/2021 T4 (Lemmon) Orbital Elements
The following table lists the orbital elements of Comet C/2021 T4 (Lemmon) at epoch 19 August 2022 00:00 UTC (JD: 2459811.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 0.99996874 |
| Orbit inclination | i | 160.75778068° |
| Perihelion distance | q | 1.48199298 AU 221,702,995 km |
| Aphelion distance | Q |
94,810.21049579 AU 14,183,405,639,233 km |
| Semi-major axis | a |
47,405.84624439 AU 7,091,813,671,114 km |
| Orbital period | period |
10,321,814.6864 years 3,770,042,814.1990 days |
| Date of perihelion transit | Tp | 2023-Jul-31 12:33:47 2,460,157.0235 JD |
| Next perihelion transit | 2023-Jul-31 12:33 3,772,502,971.2225 JD |
|
| Argument of perihelion | peri | 329.7808734849° |
| Longitude of the ascending node | node | 257.8014092137° |
| Mean anomaly | M | 359.99996700609° |
| Mean motion | n | 0.00000010°/day |
Visualization of Comet C/2021 T4 (Lemmon) Orbit
This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Comet C/2021 T4 (Lemmon) with respect of the Sun and the orbits of the major planets. The position of Comet C/2021 T4 (Lemmon) 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!
View Comet C/2021 T4 (Lemmon) in the 3D Solar System Simulator
Comet C/2021 T4 (Lemmon) 15 Days Ephemeris
The following table lists the ephemerides of Comet C/2021 T4 (Lemmon) computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Comet C/2021 T4 (Lemmon) in our Online Planetarium at the chosen date.
| Date | Right AscensionR.A. | DeclinationDec. | MagnitudeMag | Constellation |
|---|---|---|---|---|
| 2024 Apr 28 | 12h 27m 29s | +22° 24’ 20” | 16.05 | Coma |
| 2024 Apr 29 | 12h 25m 51s | +22° 28’ 45” | 16.07 | Coma |
| 2024 Apr 30 | 12h 24m 16s | +22° 32’ 53” | 16.09 | Coma |
| 2024 May 01 | 12h 22m 42s | +22° 36’ 42” | 16.12 | Coma |
| 2024 May 02 | 12h 21m 11s | +22° 40’ 13” | 16.14 | Coma |
| 2024 May 03 | 12h 19m 41s | +22° 43’ 27” | 16.17 | Coma |
| 2024 May 04 | 12h 18m 14s | +22° 46’ 24” | 16.19 | Coma |
| 2024 May 05 | 12h 16m 49s | +22° 49’ 06” | 16.22 | Coma |
| 2024 May 06 | 12h 15m 24s | +22° 51’ 33” | 16.24 | Coma |
| 2024 May 07 | 12h 14m 03s | +22° 53’ 44” | 16.26 | Coma |
| 2024 May 08 | 12h 12m 43s | +22° 55’ 40” | 16.29 | Coma |
| 2024 May 09 | 12h 11m 26s | +22° 57’ 20” | 16.31 | Coma |
| 2024 May 10 | 12h 10m 10s | +22° 58’ 49” | 16.34 | Coma |
| 2024 May 11 | 12h 08m 57s | +23° 00’ 02” | 16.36 | Coma |