Comet C/2023 H2 (Lemmon)
Comet C/2023 H2 (Lemmon) is in the constellation of
Octans,
at a distance of
Finder Charts
View interactive star map
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
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 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 0.193016 Astronomical Units, or 28,874,757 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 01 May 2023 00:00 UTC (JD: 2460066.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 0.99637280 |
| Orbit inclination | i | 113.75162616° |
| Perihelion distance | q | 0.89438096 AU 133,797,487 km |
| Aphelion distance | Q |
492.25855692 AU 73,640,832,097 km |
| Semi-major axis | a |
246.57646894 AU 36,887,314,792 km |
| Orbital period | period |
3,872.0026 years 1,414,248.9678 days |
| Date of perihelion transit | Tp | 2023-Oct-29 04:23:20 2,460,246.6829 JD |
| Next perihelion transit | 5895-Nov-28 03:36 3,874,495.6507 JD |
|
| Argument of perihelion | peri | 150.64704509475° |
| Longitude of the ascending node | node | 217.04191916104° |
| Mean anomaly | M | 359.95413407645° |
| Mean motion | n | 0.00025455°/day |
Orbit Visualization
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 Feb 04 | 20h 41m 56s | -77° 03’ 21” | 28.87 | Octans |
| 2025 Feb 05 | 20h 44m 00s | -77° 04’ 04” | 28.89 | Octans |
| 2025 Feb 06 | 20h 46m 04s | -77° 04’ 54” | 28.90 | Octans |
| 2025 Feb 07 | 20h 48m 08s | -77° 05’ 47” | 28.92 | Octans |
| 2025 Feb 08 | 20h 50m 11s | -77° 06’ 47” | 28.93 | Octans |
| 2025 Feb 09 | 20h 52m 13s | -77° 07’ 51” | 28.95 | Octans |
| 2025 Feb 10 | 20h 54m 17s | -77° 09’ 00” | 28.96 | Octans |
| 2025 Feb 11 | 20h 56m 19s | -77° 10’ 14” | 28.98 | Octans |
| 2025 Feb 12 | 20h 58m 21s | -77° 11’ 34” | 28.99 | Octans |
| 2025 Feb 13 | 21h 00m 23s | -77° 12’ 59” | 29.00 | Octans |
| 2025 Feb 14 | 21h 02m 25s | -77° 14’ 27” | 29.02 | Octans |
| 2025 Feb 15 | 21h 04m 26s | -77° 16’ 02” | 29.03 | Octans |
| 2025 Feb 16 | 21h 06m 27s | -77° 17’ 42” | 29.05 | Octans |
| 2025 Feb 17 | 21h 08m 28s | -77° 19’ 28” | 29.06 | Octans |
Additional Resources
- Position and finder charts (see also Where is Comet C/2023 H2 (Lemmon)?)
- Distance from Earth (see also How far is Comet C/2023 H2 (Lemmon) from Earth?)
- When does Comet C/2023 H2 (Lemmon) rise and set?
- Brightness (see also How bright is Comet C/2023 H2 (Lemmon)?)
- Orbital elements. Detailed information about Comet C/2023 H2 (Lemmon) orbital parameters.
- Interactive orbit visualization. 3d visualization showing the orbit of Comet C/2023 H2 (Lemmon) with respect to the major Solar System objects.
- 15 days ephemerides. Table showing celestial coordinates and magnitude of Comet C/2023 H2 (Lemmon) for the past and next 7 days.
- Interactive sky chart. An online planetarium application that shows where to locate Comet C/2023 H2 (Lemmon) in the sky from your location.
- Live position tracker. A high precision sky chart that uses real deep sky imagery to help locate Comet C/2023 H2 (Lemmon) with your telescope or on your astrophotographies.