Where is it now
- Distance from Sun
- 1.158 AU
- True anomaly
- 210.23°
- Distance from Earth
- 0.586 AU
- As of
- 21 October 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 04m 36s
- Declination
- -21° 19′ 33″
- Constellation
- Sagittarius
- Distance from Earth
- 0.59 AU
- Elongation from the Sun
- 90.01° — 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
- 0.92 AU
- Eccentricity
- 0.3513
- Inclination
- 5.96°
- Orbital period
- 322.2 days
- Perihelion
- 0.597 AU
- Aphelion
- 1.243 AU
- Longitude of ascending node
- 173.59°
- Argument of periapsis
- 334.12°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 20.3 LD
- 0.0521 AU
- Tisserand (Jupiter)
- 6.44
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 209
- Data arc
- 21.83 years
- First observed
- 8 September 2004
- Last observed
- 10 July 2026
- Residual RMS
- 0.46 ″
- Solution · Otto Matic
- 12 July 2026
Visual & observation
- Absolute magnitude (H)
- 21.49
Discovery & classification
- Discovered by
- LINEAR
- Discovery date
- 8 September 2004
- Discovery site
- Socorro
Also known as 2004 RX10
Close approaches 102 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-10-15 16:46 UTC close approach of 523605. Catalogue miss distance 39.1 LD · 1.5 × 10⁷ km. The curve is the geocentric path from 2027-10-12 to 2027-10-18, 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. At closest approach the object is south of the ecliptic. 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 |
|---|---|---|---|---|
| 2027-10-15 16:46:00 | Earth | 0.1004 AU | 39.1 LD | 12.5 km/s |
| 2028-12-02 16:59:00 | Venus | 0.1009 AU | 39.3 LD | 9.3 km/s |
| 2033-06-26 22:15:00 | Earth | 0.1282 AU | 49.9 LD | 12.1 km/s |
| 2034-09-20 03:50:00 | Earth | 0.1905 AU | 74.1 LD | 7.9 km/s |
| 2035-02-17 09:03:00 | Venus | 0.0405 AU | 15.8 LD | 13.2 km/s |
| 2036-09-17 20:47:00 | Venus | 0.133 AU | 51.8 LD | 16.7 km/s |
| 2042-10-15 03:18:00 | Earth | 0.1179 AU | 45.9 LD | 13.1 km/s |
| 2042-11-27 20:00:00 | Venus | 0.1081 AU | 42.1 LD | 7.7 km/s |
| 2048-06-26 21:39:00 | Earth | 0.1307 AU | 50.9 LD | 12.2 km/s |
| 2049-03-08 00:25:00 | Venus | 0.1305 AU | 50.8 LD | 10 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