2023 SZ is an asteroid in the Aten orbit class. Its orbit takes it from 0.94 AU to 1.04 AU from the Sun; one orbit takes 359.9 days. Orbit from the JPL solution of 19 September 2023.
Where is it now
- Distance from Sun
- 0.951 AU
- True anomaly
- 317.42°
- Distance from Earth
- 0.269 AU
- As of
- 2 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
- 09h 33m 24s
- Declination
- -10° 13′ 13″
- Constellation
- Hydra
- Distance from Earth
- 0.27 AU
- Elongation from the Sun
- 73.33° — well clear of the Sun
Visible from both hemispheres.
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
- 0.99 AU
- Eccentricity
- 0.0524
- Inclination
- 8.04°
- Orbital period
- 359.9 days
- Perihelion
- 0.938 AU
- Aphelion
- 1.042 AU
- Longitude of ascending node
- 181.92°
- Argument of periapsis
- 275.67°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 4.1 LD
- 0.0106 AU
- Tisserand (Jupiter)
- 6.118
Orbit quality
Orbit poorly determined (uncertainty code 6).
- Observations used
- 25
- Data arc
- 3 days
- First observed
- 16 September 2023
- Last observed
- 19 September 2023
- Residual RMS
- 0.49 ″
- Solution · Otto Matic
- 19 September 2023
Visual & observation
- Absolute magnitude (H)
- 25.87
Discovery & classification
Close approaches 39 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-09-04 08:29 UTC close approach of 2023 SZ. Catalogue miss distance 124.8 LD · 4.8 × 10⁷ km. The curve is the geocentric path from 2027-09-01 to 2027-09-07, 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 |
|---|---|---|---|---|
| 2027-09-04 08:29:00 | Earth | 0.3206 AU | 124.8 LD | 11.3 km/s |
| 2028-08-28 18:28:00 | Earth | 0.4147 AU | 161.4 LD | 13.9 km/s |
| 2081-04-25 15:55:00 | Earth | 0.4373 AU | 170.2 LD | 14.6 km/s |
| 2082-04-19 09:04:00 | Earth | 0.3426 AU | 133.3 LD | 11.9 km/s |
| 2083-04-12 23:14:00 | Earth | 0.2489 AU | 96.9 LD | 9.4 km/s |
| 2084-04-05 12:48:00 | Earth | 0.1577 AU | 61.4 LD | 7.1 km/s |
| 2085-03-30 01:45:00 | Earth | 0.0722 AU | 28.1 LD | 5.3 km/s |
| 2085-10-03 02:26:00 | Earth | 0.1735 AU | 67.5 LD | 5.8 km/s |
| 2086-03-23 22:47:00 | Earth | 0.0128 AU | 5.0 LD | 4.4 km/s |
| 2086-10-01 00:55:00 | Earth | 0.1146 AU | 44.6 LD | 4.7 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