523585 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.65 AU to 1.39 AU from the Sun; one orbit takes 378.2 days. Discovered 24 June 1998 by LINEAR. Orbit from the JPL solution of 17 August 2026.
Where is it now
- Distance from Sun
- 1.047 AU
- True anomaly
- 245.42°
- Distance from Earth
- 0.85 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
- 19h 32m 44s
- Declination
- -29° 33′ 00″
- Constellation
- Sagittarius
- Distance from Earth
- 0.85 AU
- Elongation from the Sun
- 68.52° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 1.023 AU
- Eccentricity
- 0.3629
- Inclination
- 6.29°
- Orbital period
- 378.2 days
- Perihelion
- 0.652 AU
- Aphelion
- 1.395 AU
- Longitude of ascending node
- 80.12°
- Argument of periapsis
- 26.88°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 29.6 LD
- 0.076 AU
- Tisserand (Jupiter)
- 5.906
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 722
- Data arc
- 28.14 years
- First observed
- 24 June 1998
- Last observed
- 15 August 2026
- Residual RMS
- 0.4 ″
- Solution · Otto Matic
- 17 August 2026
Visual & observation
- Absolute magnitude (H)
- 18.68
- Spectral type (SMASS)
- Sq
Discovery & classification
- Discovered by
- LINEAR
- Discovery date
- 24 June 1998
- Discovery site
- Socorro
Also known as 1998 MW5 · 1999 JW3
Close approaches 79 on record
Top-down view of the ecliptic, Earth at the centre, for the 2029-04-27 15:27 UTC close approach of 523585. Catalogue miss distance 33.4 LD · 1.29 × 10⁷ km. The curve is the geocentric path from 2029-04-24 to 2029-04-30, 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 north 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 |
|---|---|---|---|---|
| 2029-04-27 15:27:00 | Earth | 0.0859 AU | 33.4 LD | 9.6 km/s |
| 2030-05-04 13:46:00 | Earth | 0.1905 AU | 74.1 LD | 15.9 km/s |
| 2034-03-22 00:34:00 | Venus | 0.0849 AU | 33.0 LD | 13.6 km/s |
| 2037-05-23 08:12:00 | Venus | 0.0675 AU | 26.3 LD | 8 km/s |
| 2040-07-29 08:20:00 | Venus | 0.0743 AU | 28.9 LD | 12.6 km/s |
| 2051-09-17 20:32:00 | Earth | 0.1752 AU | 68.2 LD | 14.7 km/s |
| 2052-09-27 14:13:00 | Earth | 0.1346 AU | 52.4 LD | 8.2 km/s |
| 2056-12-31 21:37:00 | Venus | 0.0171 AU | 6.7 LD | 9.8 km/s |
| 2058-05-02 19:11:00 | Earth | 0.1611 AU | 62.7 LD | 7.4 km/s |
| 2059-04-30 20:41:00 | Earth | 0.0964 AU | 37.5 LD | 12.4 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB