163899
Add to an observing list or journal →163899 (2003 SD220)
Where is it now
- Distance from Sun
- 0.656 AU
- True anomaly
- 9.82°
- Distance from Earth
- 1.535 AU
- As of
- 19 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
- 14h 43m 44s
- Declination
- -17° 20′ 56″
- Constellation
- Libra
- Distance from Earth
- 1.53 AU
- Elongation from the Sun
- 17.45° — too close to the Sun to observe
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
- 0.828 AU
- Eccentricity
- 0.2094
- Inclination
- 8.55°
- Orbital period
- 275.1 days
- Perihelion
- 0.654 AU
- Aphelion
- 1.001 AU
- Longitude of ascending node
- 273.63°
- Argument of periapsis
- 327.02°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 7.0 LD
- 0.018 AU
- Tisserand (Jupiter)
- 7.056
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 1,935
- Data arc
- 25.06 years
- First observed
- 6 January 2000
- Last observed
- 27 January 2025
- Residual RMS
- 0.2 ″
- Solution · Giorgini
- 30 January 2026
Physical properties
- Mean radius
- 0.40 km
- Rotation period
- 11.88 days
Visual & observation
- Geometric albedo
- 0.34
- Absolute magnitude (H)
- 17.56
Discovery & classification
- Discovered by
- LONEOS
- Discovery date
- 29 September 2003
- Discovery site
- Anderson Mesa
Also known as 2003 SD220 · 2000 AD229
Close approaches 72 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-11-12 18:17 UTC close approach of 163899. Catalogue miss distance 53.8 LD · 2.07 × 10⁷ km. The curve is the geocentric path from 2027-11-09 to 2027-11-15, 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. 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 |
|---|---|---|---|---|
| 2027-11-12 18:17:00 | Earth | 0.1382 AU | 53.8 LD | 6.6 km/s |
| 2029-02-13 06:01:00 | Venus | 0.1239 AU | 48.2 LD | 12.7 km/s |
| 2038-11-03 05:38:00 | Venus | 0.1199 AU | 46.7 LD | 9.1 km/s |
| 2045-09-06 08:46:00 | Venus | 0.0548 AU | 21.3 LD | 9.4 km/s |
| 2052-06-30 12:41:00 | Venus | 0.1222 AU | 47.6 LD | 12.7 km/s |
| 2062-03-21 02:20:00 | Venus | 0.1193 AU | 46.4 LD | 9.1 km/s |
| 2064-12-23 15:38:00 | Earth | 0.125 AU | 48.6 LD | 9.3 km/s |
| 2067-12-24 02:51:00 | Earth | 0.0485 AU | 18.9 LD | 7.2 km/s |
| 2069-01-13 01:46:00 | Venus | 0.0756 AU | 29.4 LD | 9.3 km/s |
| 2070-12-20 23:49:00 | Earth | 0.0182 AU | 7.1 LD | 6 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)
- orbital elements: JPL SBDB