439437
Add to an observing list or journal →439437 (2013 NK4)
439437 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.46 AU to 1.59 AU from the Sun; one orbit takes 377.7 days. Discovered 1 July 2013 by Siding Spring Survey. Orbit from the JPL solution of 14 May 2026.
Where is it now
- Distance from Sun
- 1.513 AU
- True anomaly
- 196.1°
- Distance from Earth
- 2.193 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
- 17h 05m 07s
- Declination
- -26° 59′ 51″
- Constellation
- Ophiuchus
- Distance from Earth
- 2.2 AU
- Elongation from the Sun
- 36.02° — near the Sun — look low at dusk or dawn
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
- 1.023 AU
- Eccentricity
- 0.5499
- Inclination
- 6.55°
- Orbital period
- 377.7 days
- Perihelion
- 0.46 AU
- Aphelion
- 1.585 AU
- Longitude of ascending node
- 33.69°
- Argument of periapsis
- 50.6°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 5.9 LD
- 0.0151 AU
- Tisserand (Jupiter)
- 5.824
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 623
- Data arc
- 12.87 years
- First observed
- 1 July 2013
- Last observed
- 14 May 2026
- Residual RMS
- 0.37 ″
- Solution · Otto Matic
- 14 May 2026
Visual & observation
- Absolute magnitude (H)
- 18.94
Discovery & classification
- Discovered by
- Siding Spring Survey
- Discovery date
- 1 July 2013
- Discovery site
- Siding Spring
Also known as 2013 NK4
Close approaches 80 on record
Top-down view of the ecliptic, Earth at the centre, for the 2043-08-10 09:09 UTC close approach of 439437. Catalogue miss distance 72.5 LD · 2.79 × 10⁷ km. The curve is the geocentric path from 2043-08-07 to 2043-08-13, 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 |
|---|---|---|---|---|
| 2029-03-16 08:46:00 | Venus | 0.0236 AU | 9.2 LD | 20.4 km/s |
| 2032-04-25 16:48:00 | Venus | 0.148 AU | 57.6 LD | 12.9 km/s |
| 2038-12-31 22:05:00 | Mars | 0.0978 AU | 38.1 LD | 10.2 km/s |
| 2043-08-10 09:09:00 | Earth | 0.1862 AU | 72.5 LD | 21.3 km/s |
| 2044-08-17 11:43:00 | Earth | 0.1187 AU | 46.2 LD | 15.4 km/s |
| 2044-11-16 06:39:00 | Venus | 0.1252 AU | 48.7 LD | 13.5 km/s |
| 2047-12-24 23:52:00 | Venus | 0.0478 AU | 18.6 LD | 21.7 km/s |
| 2054-04-15 04:08:00 | Earth | 0.1972 AU | 76.7 LD | 11.9 km/s |
| 2055-01-15 00:17:00 | Venus | 0.0603 AU | 23.5 LD | 22.3 km/s |
| 2055-04-17 05:55:00 | Earth | 0.0144 AU | 5.6 LD | 17 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