2023 HM4 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.96 AU to 1.06 AU from the Sun; one orbit takes 373 days. Orbit from the JPL solution of 11 July 2023.
Where is it now
- Distance from Sun
- 1.016 AU
- True anomaly
- 265.45°
- Distance from Earth
- 0.563 AU
- As of
- 3 November 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 20h 01m 03s
- Declination
- -22° 57′ 11″
- Constellation
- Sagittarius
- Distance from Earth
- 0.56 AU
- Elongation from the Sun
- 76.03° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.
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Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 1.014 AU
- Eccentricity
- 0.049
- Inclination
- 1.54°
- Orbital period
- 373 days
- Perihelion
- 0.964 AU
- Aphelion
- 1.064 AU
- Longitude of ascending node
- 67.88°
- Argument of periapsis
- 35.48°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 4.3 LD
- 0.0109 AU
- Tisserand (Jupiter)
- 6.013
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 102
- Data arc
- 86 days
- First observed
- 14 April 2023
- Last observed
- 9 July 2023
- Residual RMS
- 0.47 ″
- Solution · Otto Matic
- 11 July 2023
Visual & observation
- Absolute magnitude (H)
- 27.69
Discovery & classification
Listed by JPL impact monitoring; see the Sentry table for current probabilities.
Close approaches 33 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-04-16 18:23 UTC close approach of 2023 HM4. Catalogue miss distance 184.5 LD · 7.09 × 10⁷ km. The curve is the geocentric path from 2027-04-13 to 2027-04-19, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2027-04-16 18:23:00 | Earth | 0.474 AU | 184.5 LD | 15 km/s |
| 2067-10-02 18:07:00 | Earth | 0.3739 AU | 145.5 LD | 12.1 km/s |
| 2068-10-09 15:49:00 | Earth | 0.2435 AU | 94.8 LD | 8.2 km/s |
| 2069-10-18 19:20:00 | Earth | 0.1165 AU | 45.4 LD | 4.4 km/s |
| 2070-11-04 00:39:00 | Earth | 0.0128 AU | 5.0 LD | 1.4 km/s |
| 2071-10-22 04:18:00 | Earth | 0.022 AU | 8.6 LD | 1.6 km/s |
| 2072-09-26 11:21:00 | Earth | 0.1266 AU | 49.3 LD | 4.4 km/s |
| 2073-09-14 11:04:00 | Earth | 0.2508 AU | 97.6 LD | 8 km/s |
| 2074-09-04 15:46:00 | Earth | 0.3785 AU | 147.3 LD | 11.8 km/s |
| 2114-06-16 13:39:00 | Earth | 0.3892 AU | 151.5 LD | 12.1 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB