Where is it now
- Distance from Sun
- 0.737 AU
- True anomaly
- 134.53°
- Distance from Earth
- 1.38 AU
- As of
- 16 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
- 11h 24m 32s
- Declination
- -01° 59′ 14″
- Constellation
- Leo
- Distance from Earth
- 1.38 AU
- Elongation from the Sun
- 31.15° — near the Sun — look low at dusk or dawn
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
- 0.739 AU
- Eccentricity
- 0.7031
- Inclination
- 12.6°
- Orbital period
- 232 days
- Perihelion
- 0.219 AU
- Aphelion
- 1.258 AU
- Longitude of ascending node
- 180.43°
- Argument of periapsis
- 172.43°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 27.6 LD
- 0.0709 AU
- Tisserand (Jupiter)
- 7.565
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 2,132
- Data arc
- 55.13 years
- First observed
- 26 March 1971
- Last observed
- 14 May 2026
- Residual RMS
- 0.39 ″
- Solution · Otto Matic
- 6 June 2026
Physical properties
- Mean radius
- 0.30 km
- Rotation period
- 28.08 hours
Visual & observation
- Geometric albedo
- 0.32
- Absolute magnitude (H)
- 18.09
- Spectral type (SMASS)
- S
Discovery & classification
- Discovered by
- LINEAR
- Discovery date
- 24 March 1999
- Discovery site
- Socorro
Also known as 1999 FK21
Close approaches 166 on record
Top-down view of the ecliptic, Earth at the centre, for the 2028-02-16 12:19 UTC close approach of 85953. Catalogue miss distance 48.3 LD · 1.86 × 10⁷ km. The curve is the geocentric path from 2028-02-13 to 2028-02-19, 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. 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 |
|---|---|---|---|---|
| 2028-02-16 12:19:00 | Earth | 0.124 AU | 48.3 LD | 19.4 km/s |
| 2029-04-05 04:29:00 | Merc | 0.0689 AU | 26.8 LD | 41.6 km/s |
| 2029-04-05 04:29:00 | Mercury | 0.0689 AU | 26.8 LD | 41.6 km/s |
| 2032-04-07 22:55:00 | Earth | 0.0755 AU | 29.4 LD | 20.8 km/s |
| 2035-02-17 10:56:00 | Earth | 0.1439 AU | 56.0 LD | 17.8 km/s |
| 2036-03-30 17:58:00 | Mercury | 0.0746 AU | 29.0 LD | 43.4 km/s |
| 2036-03-30 17:58:00 | Merc | 0.0746 AU | 29.0 LD | 43.4 km/s |
| 2039-04-07 08:52:00 | Earth | 0.1251 AU | 48.7 LD | 23.3 km/s |
| 2042-02-20 16:24:00 | Earth | 0.1832 AU | 71.3 LD | 16.7 km/s |
| 2042-07-01 23:00:00 | Venus | 0.1407 AU | 54.8 LD | 33.5 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- physical properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB