Comet C/2023 H5 (Lemmon)
Comet C/2023 H5 (Lemmon) is in the constellation of
Ursa Major,
at a distance of
Finder Charts
View interactive star map
High precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2023 H5 (Lemmon) is right now. Click on the image to see a more detailed fullscreen tracker view.
Also check out Where is Comet C/2023 H5 (Lemmon)?, a page that provides all the information needed to find Comet C/2023 H5 (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 H5 (Lemmon) from Greenwich, UK (all times relative to the local timezone Europe/London):
- C/2023 H5 (Lemmon) is above the horizon from Greenwich, UK.
- Right now it is placed in the North-North-East direction at an altitude of 36.45° above the horizon.
- Given its current magnitude, C/2023 H5 (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 H5 (Lemmon) from Earth is currently
The following chart shows the distance of Comet C/2023 H5 (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 H5 (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 H5 (Lemmon) to Earth happens on Sat Feb 22 2025 at a distance of 3.738543 Astronomical Units, or 559,278,089 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 H5 (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 H5 (Lemmon) at epoch 04 September 2024 00:00 UTC (JD: 2460558.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 1.00038807 |
| Orbit inclination | i | 97.86088989° |
| Perihelion distance | q | 4.31283269 AU 645,190,588 km |
| Aphelion distance | Q | n.a. |
| Semi-major axis | a | n.a. |
| Orbital period | period | n.a. |
| Date of perihelion transit | Tp | 2025-Jun-30 04:12:16 2,460,856.6752 JD |
| Argument of perihelion | peri | 60.082903930745° |
| Longitude of the ascending node | node | 159.48174964041° |
| Mean anomaly | M | -0.00025084129973455° |
| Mean motion | n | 0.00000084°/day |
Orbit Visualization
View Comet C/2023 H5 (Lemmon) in the 3D Solar System Simulator
15 Days Ephemeris
The following table lists the ephemerides of Comet C/2023 H5 (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 Apr 11 | 11h 09m 47s | +64° 50’ 26” | 16.38 | Ursa Major |
| 2025 Apr 12 | 11h 08m 25s | +64° 55’ 15” | 16.39 | Ursa Major |
| 2025 Apr 13 | 11h 07m 03s | +64° 59’ 49” | 16.39 | Ursa Major |
| 2025 Apr 14 | 11h 05m 44s | +65° 04’ 08” | 16.40 | Ursa Major |
| 2025 Apr 15 | 11h 04m 25s | +65° 08’ 11” | 16.40 | Ursa Major |
| 2025 Apr 16 | 11h 03m 08s | +65° 11’ 57” | 16.41 | Ursa Major |
| 2025 Apr 17 | 11h 01m 52s | +65° 15’ 30” | 16.41 | Ursa Major |
| 2025 Apr 18 | 11h 00m 39s | +65° 18’ 48” | 16.42 | Ursa Major |
| 2025 Apr 19 | 10h 59m 26s | +65° 21’ 51” | 16.42 | Ursa Major |
| 2025 Apr 20 | 10h 58m 14s | +65° 24’ 41” | 16.43 | Ursa Major |
| 2025 Apr 21 | 10h 57m 05s | +65° 27’ 18” | 16.43 | Ursa Major |
| 2025 Apr 22 | 10h 55m 57s | +65° 29’ 42” | 16.43 | Ursa Major |
| 2025 Apr 23 | 10h 54m 52s | +65° 31’ 52” | 16.44 | Ursa Major |
| 2025 Apr 24 | 10h 53m 48s | +65° 33’ 50” | 16.44 | Ursa Major |
Additional Resources
- Position and finder charts (see also Where is Comet C/2023 H5 (Lemmon)?)
- Distance from Earth (see also How far is Comet C/2023 H5 (Lemmon) from Earth?)
- When does Comet C/2023 H5 (Lemmon) rise and set?
- Brightness (see also How bright is Comet C/2023 H5 (Lemmon)?)
- Orbital elements. Detailed information about Comet C/2023 H5 (Lemmon) orbital parameters.
- Interactive orbit visualization. 3d visualization showing the orbit of Comet C/2023 H5 (Lemmon) with respect to the major Solar System objects.
- 15 days ephemerides. Table showing celestial coordinates and magnitude of Comet C/2023 H5 (Lemmon) for the past and next 7 days.
- Interactive sky chart. An online planetarium application that shows where to locate Comet C/2023 H5 (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 H5 (Lemmon) with your telescope or on your astrophotographies.