471984 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.79 AU to 1.26 AU from the Sun; one orbit takes 379.7 days. Discovered 24 October 2013 by Mt. Lemmon Survey. Orbit from the JPL solution of 14 April 2021.
Where is it now
- Distance from Sun
- 1.032 AU
- True anomaly
- 104.53°
- Distance from Earth
- 1.832 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
- 16h 22m 40s
- Declination
- -22° 51′ 15″
- Constellation
- Scorpius
- Distance from Earth
- 1.83 AU
- Elongation from the Sun
- 25.72° — 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
- 1.026 AU
- Eccentricity
- 0.2256
- Inclination
- 3.36°
- Orbital period
- 379.7 days
- Perihelion
- 0.795 AU
- Aphelion
- 1.258 AU
- Longitude of ascending node
- 49.7°
- Argument of periapsis
- 117.46°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 9.1 LD
- 0.0233 AU
- Tisserand (Jupiter)
- 5.934
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 115
- Data arc
- 2.79 years
- First observed
- 24 October 2013
- Last observed
- 9 August 2016
- Residual RMS
- 0.34 ″
- Solution · Otto Matic
- 14 April 2021
Visual & observation
- Absolute magnitude (H)
- 22.86
Discovery & classification
- Discovered by
- Mt. Lemmon Survey
- Discovery date
- 24 October 2013
- Discovery site
- Mount Lemmon
Also known as 2013 UE3
Close approaches 125 on record
Top-down view of the ecliptic, Earth at the centre, for the 2038-11-24 20:32 UTC close approach of 471984. Catalogue miss distance 102.6 LD · 3.95 × 10⁷ km. The curve is the geocentric path from 2038-11-21 to 2038-11-27, 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 |
|---|---|---|---|---|
| 2027-09-03 07:00:00 | Venus | 0.0934 AU | 36.3 LD | 2.3 km/s |
| 2038-11-24 20:32:00 | Earth | 0.2637 AU | 102.6 LD | 14.6 km/s |
| 2039-12-05 05:04:00 | Earth | 0.028 AU | 10.9 LD | 7.2 km/s |
| 2040-10-30 03:21:00 | Earth | 0.1866 AU | 72.6 LD | 5.2 km/s |
| 2041-02-02 19:49:00 | Earth | 0.1798 AU | 70.0 LD | 5.9 km/s |
| 2041-09-22 01:27:00 | Earth | 0.2516 AU | 97.9 LD | 6.2 km/s |
| 2042-03-26 16:17:00 | Earth | 0.2003 AU | 78.0 LD | 7 km/s |
| 2042-08-18 07:42:00 | Earth | 0.2371 AU | 92.3 LD | 5.8 km/s |
| 2043-06-03 00:11:00 | Earth | 0.1074 AU | 41.8 LD | 4.2 km/s |
| 2044-04-08 08:35:00 | Venus | 0.0744 AU | 29.0 LD | 2 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