2025 SJ12 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.77 AU to 1.3 AU from the Sun; one orbit takes 385 days. Orbit from the JPL solution of 26 September 2025.
Where is it now
- Distance from Sun
- 1.131 AU
- True anomaly
- 124.5°
- Distance from Earth
- 0.522 AU
- As of
- 4 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
- 21h 30m 04s
- Declination
- -34° 05′ 06″
- Constellation
- Piscis Austrinus
- Distance from Earth
- 0.52 AU
- Elongation from the Sun
- 91.36° — 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
- 1.036 AU
- Eccentricity
- 0.2527
- Inclination
- 21.4°
- Orbital period
- 385 days
- Perihelion
- 0.774 AU
- Aphelion
- 1.297 AU
- Longitude of ascending node
- 174.17°
- Argument of periapsis
- 78.85°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 4.3 LD
- 0.0109 AU
- Tisserand (Jupiter)
- 5.828
Orbit quality
Orbit poorly determined (uncertainty code 7).
- Observations used
- 11
- Data arc
- 24 hours
- First observed
- 17 September 2025
- Last observed
- 18 September 2025
- Residual RMS
- 0.55 ″
- Solution · Otto Matic
- 26 September 2025
Visual & observation
- Absolute magnitude (H)
- 28.17
Discovery & classification
Close approaches 8 on record
Top-down view of the ecliptic, Earth at the centre, for the 2044-09-12 12:50 UTC close approach of 2025 SJ12. Catalogue miss distance 71.5 LD · 2.75 × 10⁷ km. The curve is the geocentric path from 2044-09-09 to 2044-09-15, 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 |
|---|---|---|---|---|
| 2044-09-12 12:50:00 | Earth | 0.1838 AU | 71.5 LD | 11.1 km/s |
| 2045-09-21 00:51:00 | Earth | 0.1455 AU | 56.6 LD | 16.5 km/s |
| 2064-09-15 06:37:00 | Earth | 0.0271 AU | 10.5 LD | 13.1 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