329915 is an asteroid in the Aten orbit class. Its orbit takes it from 0.2 AU to 1.77 AU from the Sun; one orbit takes 357.3 days; it is about 1.01 km across. Discovered 16 June 2005 by Siding Spring Survey. Orbit from the JPL solution of 19 August 2026.
Where is it now
- Distance from Sun
- 0.922 AU
- True anomaly
- 139.56°
- Distance from Earth
- 1.735 AU
- As of
- 2 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
- 16h 11m 26s
- Declination
- -22° 07′ 14″
- Constellation
- Scorpius
- Distance from Earth
- 1.74 AU
- Elongation from the Sun
- 24.07° — near the Sun — look low at dusk or dawn
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
- 0.985 AU
- Eccentricity
- 0.793
- Inclination
- 41.36°
- Orbital period
- 357.3 days
- Perihelion
- 0.204 AU
- Aphelion
- 1.767 AU
- Longitude of ascending node
- 88.59°
- Argument of periapsis
- 42.86°
- Epoch · J2000
- 2461200.5
- Orbit class · ATE
- Aten
- Earth MOID · 26.8 LD
- 0.0689 AU
- Tisserand (Jupiter)
- 5.678
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 200
- Data arc
- 23.22 years
- First observed
- 30 May 2003
- Last observed
- 19 August 2026
- Residual RMS
- 0.61 ″
- Solution · Otto Matic
- 19 August 2026
Physical properties
- Mean radius
- 0.51 km
Visual & observation
- Geometric albedo
- 0.249
- Absolute magnitude (H)
- 17.05
Discovery & classification
- Discovered by
- Siding Spring Survey
- Discovery date
- 16 June 2005
- Discovery site
- Siding Spring
Also known as 2005 MB
Close approaches 71 on record
Top-down view of the ecliptic, Earth at the centre, for the 2042-06-29 06:10 UTC close approach of 329915. Catalogue miss distance 53.4 LD · 2.05 × 10⁷ km. The curve is the geocentric path from 2042-06-26 to 2042-07-02, 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 |
|---|---|---|---|---|
| 2036-07-02 01:05:00 | Merc | 0.091 AU | 35.4 LD | 50.7 km/s |
| 2036-07-02 01:05:00 | Mercury | 0.091 AU | 35.4 LD | 50.7 km/s |
| 2039-07-09 14:31:00 | Venus | 0.1101 AU | 42.9 LD | 40.5 km/s |
| 2042-06-29 06:10:00 | Earth | 0.1373 AU | 53.4 LD | 34.1 km/s |
| 2043-06-24 20:12:00 | Earth | 0.0697 AU | 27.1 LD | 30.9 km/s |
| 2044-06-04 09:38:00 | Venus | 0.127 AU | 49.4 LD | 32.3 km/s |
| 2044-06-20 02:18:00 | Earth | 0.1314 AU | 51.1 LD | 28 km/s |
| 2052-02-25 18:05:00 | Merc | 0.0803 AU | 31.3 LD | 51.8 km/s |
| 2052-02-25 18:05:00 | Mercury | 0.0803 AU | 31.3 LD | 51.8 km/s |
| 2061-01-16 08:20:00 | Venus | 0.0659 AU | 25.6 LD | 36.8 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)
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB