Comet C/2023 H2 (Lemmon)
Comet C/2023 H2 (Lemmon) is in the constellation of
Octans,
at a distance of
Finder Charts
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High precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2023 H2 (Lemmon) is right now. Click on the image to see a more detailed fullscreen tracker view.
Also check out Where is Comet C/2023 H2 (Lemmon)?, a page that provides all the information needed to find Comet C/2023 H2 (Lemmon) in the sky and additional links to sky charts.
Celestial Coordinates
Apparent
J2000
Additional Information
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 C/2023 H2 (Lemmon) from Greenwich, UK (all times relative to the local timezone Europe/London):
Today Comet C/2023 H2 (Lemmon) is not visible from Greenwich, UK
- C/2023 H2 (Lemmon) is below the horizon from Greenwich, UK.
- Given its current magnitude, C/2023 H2 (Lemmon) is visible only through long exposure photography.
- Go to interactive sky chart
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Distance from Earth
The distance of Comet C/2023 H2 (Lemmon) from Earth is currently
The following chart shows the distance of Comet C/2023 H2 (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/2023 H2 (Lemmon) 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 C/2023 H2 (Lemmon) to Earth happens on Sat Nov 11 2023 at a distance of 0.193049 Astronomical Units, or 28,879,775 kilometers:
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 C/2023 H2 (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.
Orbital Elements
The following table lists the orbital elements of Comet C/2023 H2 (Lemmon) at epoch 06 October 2023 00:00 UTC (JD: 2460224.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 0.99628184 |
| Orbit inclination | i | 113.75348343° |
| Perihelion distance | q | 0.89440522 AU 133,801,116 km |
| Aphelion distance | Q |
480.20657957 AU 71,837,881,944 km |
| Semi-major axis | a |
240.55049240 AU 35,985,841,530 km |
| Orbital period | period |
3,730.9341 years 1,362,723.6784 days |
| Date of perihelion transit | Tp | 2023-Oct-29 04:33:37 2,460,246.6900 JD |
| Next perihelion transit | 5754-Nov-01 20:50 3,822,970.3684 JD |
|
| Argument of perihelion | peri | 150.65034885899° |
| Longitude of the ascending node | node | 217.04480550749° |
| Mean anomaly | M | 359.99413791105° |
| Mean motion | n | 0.00026418°/day |
View Comet C/2023 H2 (Lemmon) in the 3D Solar System Simulator
15 Days Ephemeris
The following table lists the ephemerides of Comet C/2023 H2 (Lemmon) 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 16 | 00h 24m 16s | -85° 39’ 58” | 24.67 | Octans |
| 2025 May 17 | 00h 28m 08s | -85° 48’ 50” | 24.67 | Octans |
| 2025 May 18 | 00h 32m 11s | -85° 57’ 43” | 24.67 | Octans |
| 2025 May 19 | 00h 36m 27s | -86° 06’ 37” | 24.68 | Octans |
| 2025 May 20 | 00h 40m 55s | -86° 15’ 32” | 24.68 | Octans |
| 2025 May 21 | 00h 45m 40s | -86° 24’ 27” | 24.69 | Octans |
| 2025 May 22 | 00h 50m 40s | -86° 33’ 22” | 24.69 | Octans |
| 2025 May 23 | 00h 56m 01s | -86° 42’ 15” | 24.70 | Octans |
| 2025 May 24 | 01h 01m 43s | -86° 51’ 08” | 24.70 | Octans |
| 2025 May 25 | 01h 07m 51s | -86° 59’ 59” | 24.70 | Octans |
| 2025 May 26 | 01h 14m 28s | -87° 08’ 46” | 24.71 | Octans |
| 2025 May 27 | 01h 21m 38s | -87° 17’ 31” | 24.71 | Octans |
| 2025 May 28 | 01h 29m 27s | -87° 26’ 11” | 24.72 | Octans |
| 2025 May 29 | 01h 38m 03s | -87° 34’ 45” | 24.72 | Octans |
Additional Resources on TheSkyLive
- Comet C/2023 H2 (Lemmon): Complete reference information on TheSkyLive.com.
- Where is Comet C/2023 H2 (Lemmon)?: Key information on locating Comet C/2023 H2 (Lemmon) in the sky.
- Distance from Earth: Find out how far Comet C/2023 H2 (Lemmon) is from Earth right now.
- How Bright is Comet C/2023 H2 (Lemmon)?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Comet C/2023 H2 (Lemmon)'s rise and set times from your location.
- Interactive Sky Map: planetarium-style interactive visualization of Comet C/2023 H2 (Lemmon)'s position in the sky.
- Live Position Tracker: high precision position tracker with deep space imagery.
- Ephemeris: 15 days Comet C/2023 H2 (Lemmon)'s computed ephemeris.
- Orbital elements: information about Comet C/2023 H2 (Lemmon) orbital parameters.
- Orbit Visualization. 3d interactive visualization showing the orbit of Comet C/2023 H2 (Lemmon) with respect to the major Solar System objects.