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Asteroid Near-Earth

2017 DL123

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(2017 DL123)

Where is it now

Distance from Sun
0.711 AU
True anomaly
340.35°
Distance from Earth
0.551 AU
As of
20 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.

Sun Earth — 0.996 AU from the Sun Earth 2017 DL123 — 0.711 AU from the Sun 2017 DL123
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 DL123 is 0.551 AU from Earth today (4.6 light-minutes).

In the sky

Right ascension
16h 41m 53s
Declination
-11° 23′ 04″
Constellation
Ophiuchus
Distance from Earth
0.55 AU
Elongation from the Sun
43.87° — 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.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

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
0.883 AU
Eccentricity
0.2031
Inclination
19.8°
Orbital period
303.1 days
Perihelion
0.704 AU
Aphelion
1.062 AU
Longitude of ascending node
332.46°
Argument of periapsis
44.15°
Epoch · J2000
2460600.5
Orbit class · ATE
Aten
Tisserand (Jupiter)
6.652

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
20
Data arc
0 hours
First observed
21 February 2017
Last observed
21 February 2017
Residual RMS
0.76 ″

Visual & observation

Absolute magnitude (H)
29.88

Discovery & classification

Aten Near-Earth Object

Sources